2004 INFINITI QX56 service schedule

TROUBLE DIAGNOSIS
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CONSULT-II Function (A/T)UCS002D8
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II REFERENCE VALUE
NOTICE:
1. The CONSULT-II electrically displays shift timing and lock-up timing (that is, operation timing of each sole-
noid).
Check for time difference between actual shift timing and the CONSULT-II display. If the difference is
noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) displayed on CONSULT-II and that indicated in Service Man-
ual may differ slightly. This occurs because of the following reasons:
–Actual shift schedule has more or less tolerance or allowance,
–Shift schedule indicated in Service Manual refers to the point where shifts start, and
–Gear position displayed on CONSULT-II indicates the point where shifts are completed.
3. Display of solenoid valves on CONSULT-II changes at the start of shifting, while gear position is displayed
upon completion of shifting (which is computed by TCM).
TCM diagnostic mode Description
WORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the TCM for setting the status
suitable for required operation, input/output signals are received from the TCM and received data is
displayed.
SELF-DIAG RESULTS Displays TCM self-diagnosis results.
DATA MONITOR Displays TCM input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
FUNCTION TESTConducted by CONSULT-II instead of a technician to determine whether each system is “OK” or
“NG”.
ECU PART NUMBER TCM part number can be read.
Item name Condition Display value
AT F T E M P S E 1
0°C (32° F) - 20°C (68°F) - 80°C (176°F)3.2 - 2.5 - 0.8 V
AT F T E M P S E 23.2 - 2.4 - 0.65 V
TCC SOLENOIDWhen perform slip lock-up 0.2 - 0.4 A
When perform lock-up 0.4 - 0.6 A
SLCT LVR POSISelector lever in “N”,“P” position. N/P
Selector lever in “R” position. R
Selector lever in “D” position. D
Selector lever in “4” position. 4
Selector lever in “3” position. 3
Selector lever in “2” position. 2
Selector lever in “1” position. 1
VHCL/S SE·A/T During driving Approximately matches the
speedometer reading.
ENGINE SPEED Engine running Closely matches the tachometer
reading.
LINE PRES SOL During driving 0.2 - 0.6 A
TURBINE REV During driving (lock-up ON) Approximately matches the
engine speed.
VHCL/S SE·MTR During driving Approximately matches the
speedometer reading.

BASIC SERVICE PROCEDURE
EC-35
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INSPECTION PROCEDURE
1. INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
–Harness connectors for improper connections
–Wiring harness for improper connections, pinches and cut
–Vacuum hoses for splits, kinks and improper connections
–Hoses and ducts for leaks
–Air cleaner clogging
–Gasket
3. Confirm that electrical or mechanical loads are not applied.
–Headlamp switch is OFF.
–Air conditioner switch is OFF.
–Rear window defogger switch is OFF.
–Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.
5. Run engine at about 2,000 rpm for about 2 minutes under no
load.
6. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
SEF 9 83 U
SEF 9 76 U
SEF 9 77 U

TROUBLE DIAGNOSIS
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Basic InspectionUBS00GZZ
1. INSPECTION START
1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
–Harness connectors for improper connections
–Wiring harness for improper connections, pinches and cut
–Vacuum hoses for splits, kinks and improper connections
–Hoses and ducts for leaks
–Air cleaner clogging
–Gasket
3. Confirm that electrical or mechanical loads are not applied.
–Head lamp switch is OFF.
–Air conditioner switch is OFF.
–Rear window defogger switch is OFF.
–Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.
5. Run engine at about 2,000 rpm for about 2 minutes under no
load.
6. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
SEF 9 83 U
SEF 9 76 U
SEF 9 77 U

TROUBLE DIAGNOSIS
EC-107
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*: This function is not necessary in the usual service procedure.
SELF-DIAG RESULTS MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to EC-8, "INDEX FOR DTC" .)
Freeze Frame Data and 1st Trip Freeze Frame Data
*1: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
×: Applicable Freeze frame data
item*
1Description
DIAG TROUBLE
CODE
[PXXXX]

The engine control component part/control system has a trouble code, it is displayed as “PXXXX”. (Refer
to EC-8, "
INDEX FOR DTC" .)
FUEL SYS-B1

“Fuel injection system status” at the moment a malfunction is detected is displayed.

One mode in the following is displayed.
“Mode2”: Open loop due to detected system malfunction
“Mode3”: Open loop due to driving conditions (power enrichment, deceleration enleanment)
“Mode4”: Closed loop - using oxygen sensor(s) as feedback for fuel control
“Mode5”: Open loop - has not yet satisfied condition to go to closed loop FUEL SYS-B2
CAL/LD VALUE [%]

The calculated load value at the moment a malfunction is detected is displayed.
COOLANT TEMP
[°C] or [°F]

The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%]

“Long-term fuel trim” at the moment a malfunction is detected is displayed.

The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim. L-FUEL TRM-B2 [%]
S-FUEL TRM-B1 [%]

“Short-term fuel trim” at the moment a malfunction is detected is displayed.

The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule. S-FUEL TRM-B2 [%]
ENGINE SPEED
[rpm]

The engine speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
[km/h] or [mph]

The vehicle speed at the moment a malfunction is detected is displayed.
B/FUEL SCHDL
[msec]

The base fuel schedule at the moment a malfunction is detected is displayed.
INT/A TEMP SE
[°C] or [°F]

The intake air temperature at the moment a malfunction is detected is displayed.
Monitored item
[Unit]ECM
INPUT
SIG-
NALSMAIN
SIG-
NALSDescription Remarks
ENG SPEED [rpm]××

Indicates the engine speed computed from the
signal of the crankshaft position sensor (POS)
and camshaft position sensor (PHASE).

Accuracy becomes poor if engine
speed drops below the idle rpm.

If the signal is interrupted while the
engine is running, an abnormal value
may be indicated.
MAS A/F SE-B1 [V]××

The signal voltage of the mass air flow sensor
is displayed.
When the engine is stopped, a certain
value is indicated.
B/FUEL SCHDL
[msec]×

“Base fuel schedule” indicates the fuel injec-
tion pulse width programmed into ECM, prior
to any learned on board correction.

ON-VEHICLE SERVICE
FSU-7
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Revision: August 20072004 QX56

Check with the manufacturer of your specific alignment machine for their recommended Service/Cali-
bration Schedule.
THE ALIGNMENT PROCESS
IMPORTANT: Use only the alignment specifications listed in this Service Manual. Refer to FSU-21,
"Wheelarch Height (Unladen*1 )" .
1. When displaying the alignment settings, many alignment machines use “indicators”: (Green/red, plus or
minus, Go/No Go). Do NOT use these indicators.

The alignment specifications programmed into your alignment machine that operate these indicators
may not be correct.

This may result in an ERROR.
2. Some newer alignment machines are equipped with an optional “Rolling Compensation” method to “com-
pensate” the sensors (alignment targets or head units). Do NOT use this “Rolling Compensation”
method.

Use the “Jacking Compensation” method. After installing the alignment targets or head units, raise the
vehicle and rotate the wheels 1/2 turn both ways.

See Instructions in the alignment machine you are using for more information.
CAMBER AND CASTER
1. Measure camber and caster of both the right and left wheels
with a suitable alignment gauge and adjust as necessary to
specification.
2. If outside of the specified value, adjust camber and caster using
the adjusting bolts in the front lower link.
CAUTION:
After adjusting the camber then check the toe-in.
NOTE:
Camber changes about 3' (0.11°) with each graduation of one
adjusting bolt. Refer to table below for examples of lower link
adjusting bolt effect on camber and caster.
3. Tighten the adjusting bolt nuts to specification. Refer to FSU-5, "
Components" . Camber : Refer to FSU-20, "
Wheel Alignment
(Unladen*1 )" .
SRA0 96 A
LEIA0092E
Rear adjusting
bolt1 In 1 Out 1 In 1 Out 0 0 1 In 1 Out
Front adjusting
bolt1 Out 1 In 1 In 1 Out 1 In 1 Out 0 0
Camber
Degree minute
(Decimal degree)0 (0) 0 (0) 7' (0.11°)-7' (-0.11°)3' (0.11°) -3' (-0.11°)3' (0.11°) -3' (-0.11°)
Caster
Degree minute
(Decimal degree)-14' (-0.11°) 14' (0.11°) 0 (0) 0 (0) 7' (0.11°) -7' (-0.11°)-7' (-0.11°)7' (0.11°)

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IDX
ALPHABETICAL INDEX
Brake lines and cables inspection ..................... MA-27
Brake master cylinder ....................................... BR-15
Brake switch .................................................... EC-551
BRK/SW - Wiring diagram ............................... EC-552
Bulb specifications ........................................... LT-170
Bumper, front ...................................................... EI-13
Bumper, rear ....................................................... EI-15
C
Cabin air filter .................................................... MA-20
Camshaft ........................................................... EM-43
Camshaft inspection .......................................... EM-47
Camshaft position sensor (PHASE) ................ EC-261
CAN - Wiring diagram EC-136, LAN-18, LAN-52, LAN-
92, LAN-128
CAN (Controller Area Network) .. WT-9, BRC-10, LAN-
16, LAN-50, LAN-90, LAN-126
CAN communication . EC-31, EC-135, AT-103, WT-9,
BRC-10
, LAN-16, LAN-50, LAN-90, LAN-126
Canister-See EVAP canister ........................... EC-636
Center case (Transfer) ..................................... TF-113
CHARGE - Wiring diagram ............................... SC-18
Charging system ............................................... SC-17
Chassis and body maintenance ........................ MA-20
Chassis and body maintenanceSchedule 1 ........ MA-7
Chassis and body maintenanceSchedule 2 ........ MA-9
CHIME - Wiring diagram ..................................... DI-46
Circuit breaker ................................................... PG-67
Clock ................................................................... DI-70
CLOCK - Wiring diagram .................................... DI-70
Closed loop control ........................................... EC-27
Closed loop control (Bank 1) ........................... EC-407
Closed loop control (Bank 2) ........................... EC-407
Clutch drum (Transfer) ..................................... TF-116
Clutch force release limit adjustment ................. TF-42
Clutch pressure switch (Transfer) ...................... TF-95
Coil spring (front) ............................................. FSU-10
Collision diagnosis .......................................... SRS-60
Combination lamp, front, removal and installation . LT-
33
Combination lamp, rear, removal and installation .. LT-
122
Combination meter ................................................ DI-5
Combination switch ............................................ LT-97
COMBSW - Wiring diagram ............................... LT-97
COMM - Wiring diagram ................................... AV-87
COMPAS - Wiring diagram ................................. DI-27
Compass ............................................................. DI-26
Component Location (auto A/C) ...................... ATC-37
Compressor clutch removal and installation . ATC-167
Compressor mounting ................................... ATC-166
Compressor precaution ................................... ATC-11
Compressor special service tool ..................... ATC-14
Condenser ..................................................... ATC-173
Connecting rod .................................................. EM-91
Connecting rod bearing clearance .................... EM-91
Connecting rod bushing clearance .................... EM-91
Console box - See Instrument panel ................... IP-10
Console box lamp ............................................. LT-152
CONSULT for all-mode 4WD ............................. TF-31
CONSULT for VDC ......................................... BRC-28
CONSULT-II for engine ................................... EC-103
Control units (terminal arrangement) ................. PG-71
Control valve (A/T) ............................................. AT-37
Control valve (Transfer) .................................... TF-119
Controller Area Network (CAN) . WT-9, BRC-10, LAN-
16, LAN-50, LAN-90, LAN-126
Converter housing installation ............ AT-257, AT-260
COOL/F - Wiring diagram ................................ EC-413
Coolant mixture ratio ......................................... MA-11
Coolant replacement ......................................... MA-12
Cooling circuit (engine) ........................................ CO-6
Cooling fan ........................................................ CO-13
Cooling fan control ........................................... EC-410
Cooling fan motor ............................................ EC-419
Cooling unit (A/C evaporator) ....... ATC-144, ATC-175
Corrosion protection ......................................... BL-167
Crankcase ventilation system - See Positive crankcase
ventilation ........................................................ EC-645
Crankshaft ......................................................... EM-74
Crankshaft position sensor (POS) ................... EC-255
Crash zone sensor .......................................... SRS-55
Cylinder block .................................................... EM-73
Cylinder block boring ......................................... EM-94
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D/LOCK - Wiring diagram ................................... BL-20
Data link connector .......................................... EC-105
Daytime light system .......................................... LT-34
Daytime running light - See Daytime light system .. LT-
34
DEF - Wiring diagram ....................................... GW-82
Diagnosis sensor unit ...................................... SRS-58
Diagnostic trouble code (DTC) .......................... EC-53
Diagnostic trouble code (DTC) for OBD system .. EC-8
Diagnostic trouble code (DTC) inspection priority chart
EC-76
Differential carrier assembly ............................ RFD-11
Differential carrier disassembly ....................... RFD-13
Differential gear oil replacement ........................ MA-25
Dimensions ......................................................... GI-49
Direct clutch solenoid valve ................ AT-157, AT-160
Display and amp.assembly .............................. ATC-60
Display Control Unit ......................................... AV-158
Dome light - See Interior lamp .......................... LT-129
Door glass .......................................... GW-69, GW-72
Door lock .......................................................... BL-132
Door mirror lamp ............................................... LT-129
Door trim .............................................................. EI-31
Door, front ........................................... BL-129, GW-69
Door, rear ........................................... BL-129, GW-72
Drive belt ........................................................... EM-12
Drive chain (Transfer) ....................................... TF-115
Drive pinion diff. inspection .............................. RFD-12
Drive pinion height ........................................... RFD-17
Drive shaft (rear) ................................................ RAX-7

IDX-6
ALPHABETICAL INDEX
M
MAFS - Wiring diagram ..................... EC-149
, EC-156
Magnet clutch ............................... ATC-104, ATC-167
MAIN - Wiring diagram .................................... EC-128
Main oil pump (Transfer) .................................. TF-122
Mainshaft (Transfer) ........................................ TF-116
Maintenance (engine)Schedule 1 ....................... MA-6
Maintenance (engine)Schedule 2 ....................... MA-8
Major overhaul (Final drive) .............. FFD-14, RFD-13
Major overhaul (Transfer) ................................ TF-110
Malfunction indicator lamp (MIL) ........................ EC-63
Map lamp .......................................................... LT-129
Mass air flow sensor (MAFS) ............. EC-146, EC-154
Meter ..................................................................... DI-5
METER - Wiring diagram .................................... DI-10
MIL data link connectors circuit ....................... EC-631
MIL/DL - Wiring diagram .................................. EC-631
MIRROR - Wiring diagram ................................ GW-99
Misfire .............................................................. EC-243
Mode door control linkage adjustment ............. ATC-65
Mode door motor ............................ ATC-63, ATC-152
Model variation ................................................... GI-46
Multiport fuel injection (MFI) system .................. EC-26
Multiport fuel injection precautions ....................... GI-6
Multi-remote control system ............................... BL-44
N
NATS - Wiring diagram .................................... BL-141
NAVI - Wiring diagram ....................................... AV-79
NAVI Control Unit ............................................ AV-157
Neutral-4LO switch ............................................ TF-96
Nissan torque demand (NTD) control system .... EC-29
NVH troubleshooting (AX) ................................. FAX-4
NVH troubleshooting (EM) .................................. EM-9
NVH troubleshooting (Final drive) ..................... RFD-5
NVH troubleshooting (Propeller shaft) ................. PR-3
NVH troubleshooting (RAX) .............................. RAX-4
NVH troubleshooting (RSU) .............................. RSU-5
NVH troubleshooting (ST) .................................... PS-5
NVH troubleshooting (WT)NVH troubleshooting (WT) .
WT-3
NVIS (Nissan vehicle immobilizer system) precautions
GI-3
O
O2H2B1 - Wiring diagram ................................ EC-140
O2H2B2 - Wiring diagram ................................ EC-142
O2S2B1 - Wiring diagram .. EC-188, EC-199, EC-386,
EC-398
O2S2B2 - Wiring diagram .. EC-190, EC-201, EC-388,
EC-400
Oil cooler (engine) ............................................. LU-11
Oil filter ............................................................... LU-10
Oil filter (Transfer) ............................................ TF-107
Oil pan (engine) ................................................ EM-22
Oil pressure (engine) ........................................... LU-7
Oil pressure relief valve (engine) ......................... LU-5
Oil pump (engine) .............................................. LU-13
Oil seal replacement (engine) ........................... EM-56
Oil seal replacement (front of final drive) FFD-8, RFD-6
Oil seal replacement (side of final drive) FFD-10, RFD-
8
On board diagnostic system ............................. EC-49
ORVR (On-board Refueling Vapor Recovery) EC-640
Overheat ......................................................... EC-410
P
P/SCKT - Wiring diagram ................................. WW-54
Pantograph jack .................................................. GI-40
Park/Neutral position switch ............................ EC-546
Park/neutral position switch (A/T) .................... AT-109
Parking brake control ........................................... PB-4
Parking lamp .................................................... LT-108
PCV (positive crankcase ventilation) .............. EC-645
Periodic maintenance ......................................... MA-6
Personal lamp .................................................. LT-129
PGC/V - Wiring diagram ................... EC-287, EC-498
PHASE - Wiring diagram ................................ EC-261
Pinion bearing preload diff. ............................. RFD-21
Piston pin inspection ......................................... EM-89
Piston ring inspection ........................................ EM-90
Piston to bore clearance ................................... EM-94
Planetary carrier (Transfer) .............................. TF-127
PNP/SW - Wiring diagram .............................. EC-548
POS - Wiring diagram ..................................... EC-256
POWER - Wiring diagram ................................... PG-6
Power seat ......................................................... SE-88
Power steering fluid level .................................. MA-29
Power steering gear ........................................... PS-15
Power steering oil pump .................................... PS-26
Power steering pressure (PSP) sensor ........... EC-346
Power steering system bleeding .......................... PS-6
Power supply routing .......................................... PG-4
Power window .................................................. GW-15
PRE/SE - Wiring diagram ................. EC-304, EC-310
Precautions (General) ........................................... GI-4
Precautions in repairing high strength steel ..... BL-192
Pressure switch 1 ............................... AT-154, AT-175
Pressure switch 2 ............................................. AT-172
Pressure switch 3 ............................... AT-148, AT-178
Pressure switch 5 ............................... AT-160, AT-181
Pressure switch 6 ............................... AT-166, AT-184
Pressure test (A/T) ............................................. AT-59
Propeller shaft ........................................... PR-4, PR-8
Propeller shaft inspection .................................. MA-24
Propeller shaft on vehicle service ....................... PR-8
Propeller shaft vibration ............................ PR-4, PR-8
PS/SEN - Wiring diagram ............................... EC-347
R
R/VIEW - Wiring diagram .................................... DI-75
Radiator ............................................................ CO-10
Rear Audio Remote Control Unit ....................... AV-47

MA-1
MAINTENANCE
L MAINTENANCE
CONTENTS
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SECTION MA
A
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MA
Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
PREPARATION ........................................................... 3
Special Service Tools ............................................... 3
GENERAL MAINTENANCE ....................................... 4
General Maintenance ............................................... 4
PERIODIC MAINTENANCE ....................................... 6
Introduction of Periodic Maintenance ....................... 6
Maintenance For Off-road Driving (4WD only) ......... 6
Schedule 1 ............................................................... 6
EMISSION CONTROL SYSTEM MAINTE-
NANCE .................................................................. 6
CHASSIS AND BODY MAINTENANCE ............... 7
Schedule 2 ............................................................... 8
EMISSION CONTROL SYSTEM MAINTE-
NANCE .................................................................. 8
CHASSIS AND BODY MAINTENANCE ............... 9
RECOMMENDED FLUIDS AND LUBRICANTS ...... 10
Fluids and Lubricants ............................................. 10
SAE Viscosity Number ............................................11
GASOLINE ENGINE OIL .....................................11
ANTI-FREEZE COOLANT MIXTURE RATIO ......11
ENGINE MAINTENANCE ......................................... 12
Checking Drive Belts .............................................. 12
DRIVE BELT TENSION ...................................... 12
Changing Engine Coolant ...................................... 12
DRAINING ENGINE COOLANT ......................... 12
REFILLING ENGINE COOLANT ........................ 13
FLUSHING COOLING SYSTEM ......................... 14
Checking Fuel Lines ............................................... 15
Changing Fuel Filter ............................................... 15
Changing Engine Air Cleaner Filter ........................ 15
VISCOUS PAPER TYPE ..................................... 15
Changing Engine Oil .............................................. 16
Changing Oil Filter ................................................. 16
Changing Spark Plugs ........................................... 17
REMOVAL ........................................................... 17INSPECTION AFTER REMOVAL ....................... 18
INSTALLATION ................................................... 19
Checking EVAP Vapor Lines .................................. 19
CHASSIS AND BODY MAINTENANCE ................... 20
Changing In-cabin Microfilter .................................. 20
Checking Exhaust System ...................................... 21
Checking A/T Fluid ................................................. 21
Changing A/T Fluid ................................................. 23
Checking Transfer Fluid ......................................... 24
FLUID LEAKAGE AND FLUID LEVEL ................ 24
Changing Transfer Fluid ......................................... 24
DRAINING ........................................................... 24
FILLING ............................................................... 24
Checking Propeller Shaft ........................................ 24
Checking Final Drive Oil ......................................... 24
Changing Final Drive Oil ......................................... 25
Balancing Wheels ................................................... 25
REMOVAL ........................................................... 25
WHEEL BALANCE ADJUSTMENT ..................... 25
Tire Rotation ........................................................... 27
Checking Brake Fluid Level and Leaks .................. 27
Checking Brake Lines and Cables ......................... 27
Checking Disc Brake .............................................. 28
ROTOR ................................................................ 28
CALIPER ............................................................. 28
PAD ..................................................................... 28
Checking Steering Gear and Linkage ..................... 28
STEERING GEAR ............................................... 28
STEERING LINKAGE ......................................... 28
Checking Power Steering Fluid and Lines .............. 29
CHECKING FLUID LEVEL .................................. 29
CHECKING LINES .............................................. 29
Checking Axle and Suspension Parts .................... 29
FRONT AND REAR AXLE AND SUSPENSION
PARTS ................................................................. 29
DRIVE SHAFT ..................................................... 29
Lubricating Locks, Hinges and Hood Latches ........ 30
Checking Seat Belts, Buckles, Retractors, Anchors
and Adjusters .......................................................... 31