2002 NISSAN TERRANO engine control

qA
CHECK OVERDRIVE CONTROL
SWITCH CIRCUIT.
1. Turn ignition switch to ªONº posi-
tion.
(Do not start engine.)
2. Select ªECU INPUT SIGNALSº in
Data Monitor.
3. Read out ªOVERDRIVE SWITCHº.
Check the signal of the overdrive
control switch is indicated prop-
erly.
(Overdrive control switch ªONº
displayed on CONSULT-II means
overdrive ªOFFº.)
-----------------------------------------------------------------------------------------------------------------------OR -----------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªONº posi-
tion.
(Do not start engine.)
2. Check voltage between TCM ter-
minalq
22and ground when over-
drive control switch is ªONº and
ªOFFº.
OK
ENG
Check the following items.
IOverdrive control switch
Refer to ªCOMPONENT
INSPECTIONº, AT-114.
IHarness for short or
open between TCM and
overdrive control switch
(Main harness)
IHarness for short or
open of ground circuit for
overdrive control switch
(Main harness)
qB(Go to next page.)
Switch position Voltage
ON Battery voltage
OFF 1V or less
YAT327
H
H
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Park/neutral Position, Overdrive Control or
Throttle (Accelerator) Position Switches
(Cont'd)
AT-90

qB
CHECK THROTTLE (ACCELERATOR)
POSITION SWITCH CIRCUIT.
1. Turn ignition switch to ªONº posi-
tion.
(Do not start engine.)
2. Select ªECU INPUT SIGNALSº in
Data Monitor.
3. Read out ªCLOSED THL/SWº and
ªW/O THRL/P-SWº depressing
and releasing accelerator pedal.
Check the signal of throttle (accel-
erator) position switch is indicated
properly.
-----------------------------------------------------------------------------------------------------------------------OR -----------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªONº posi-
tion.
(Do not start engine.)
2. Check voltage between TCM ter-
minalsq
16,q17and ground while
depressing, and releasing accel-
erator pedal slowly. (after warming
up engine)
OK
ENG
Check the following items:
IThrottle (accelerator)
position switch
Refer to ªCOMPONENT
INSPECTIONº, AT-114.
IHarness for short or
open between ignition
switch and throttle
(accelerator) position
switch (Main harness)
IHarness for short or
open between throttle
(accelerator) position
switch and TCM (Main
harness)
Perform ªDIAGNOSTIC PROCEDUREº,
AT-89.
OK
ENG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
Accelerator
pedal condi-
tionData monitor
CLOSED
THL/SWW/O THRL/
P-SW
Released ON OFF
Fully
depressedOFF ON
Accelerator
pedal
conditionVoltage
Terminal
No.q
16Terminal No.
q17
ReleasedBattery
voltage1V or less
Fully
depressed1V or lessBattery
voltage
YAT328
YAT329
H
H
H
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMS
Park/neutral Position, Overdrive Control or
Throttle (Accelerator) Position Switches
(Cont'd)
AT-91

1. SPORT Indicator Lamp Does Not Come On
SYMPTOM:
POWER indicator lamp does not come on for about 2 seconds
when turning ignition switch to ªONº.
CHECK TCM POWER SOURCE.
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminals
q
4,q9and ground.
Battery voltage should exist.
OK
ENG
Check the following items:
IHarness for short or
open between ignition
switch and TCM (Main
harness)
IIgnition switch and fuse
Refer to EL section
(ªPOWER SUPPLY
ROUTINGº).
CHECK TCM GROUND CIRCUIT.
1. Turn ignition switch to ªOFFº position.
2. Disconnect TCM harness connector.
3. Check resistance between TCM termi-
nalsq
15,q48and ground.
Resistance:
Approximately 0W
If OK, check harness for short to
ground and short to power.
OK
ENG
Repair open circuit or short
to ground or short to
power in harness or con-
nector.
CHECK LAMP CIRCUIT.
1. Turn ignition switch to ªONº position.
2. Set overdrive control, A/T check or
power switch to ªONº position.
3. Check voltage between TCM terminal
q
39and ground.
Voltage: Battery voltage
4. Reinstall any part removed.
OK
ENG
Check the following items:
IFuse (7.5A)
ISPORT indicator lamp
Refer to EL section
(ªWARNING LAMPSº).
IHarness for short or
open between ignition
switch and SPORT indi-
cator lamp (Main har-
ness)
Refer to EL section
(ªPOWER SUPPLY
ROUTINGº).
IHarness for short or
open between SPORT
indicator lamp and TCM
Check again.
OK
ENG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
YAT332
YAT333
YAT334
H
H
H H
H
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-94

16. A/T Does Not Hold Lock-up Condition
SYMPTOM:
A/T does not hold lock-up condition for more than 36 seconds.
Does self-diagnosis show damage to
engine speed signal circuit after cruise
test?
No
EYe s
Check engine speed sig-
nal. Refer to AT-80.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
ENG
1. Remove control valve
assembly. Refer to
AT-113.
2. Check the following
items:
ITorque converter clutch
control valve
IPilot valve
IPilot filter
3. Disassemble A/T.
4. Check torque converter
and oil pump assembly.
1. Remove control valve assembly. Refer
to AT-113.
2. Check the following items:
ITorque converter clutch control valve
IPilot valve
IPilot filter
OKFOK
Check again.
OK
ENG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
17. Lock-up Is Not Released
SYMPTOM:
Lock-up is not released when accelerator pedal is released.
Does ªECU INPUT SIGNALSº in
Data Monitor show damage to closed
throttle position switch circuit?
-----------------------------------------------------------------------------------------------------------------------OR -----------------------------------------------------------------------------------------------------------------------
Does self-diagnosis show damage to
closed throttle position switch circuit?
No
EYe s
Check closed throttle posi-
tion switch. Refer to AT-88.
Check again.
OK
ENG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
SAT835H
SAT171B
SAT146BA
H
H
H H
H
H
H
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-107

18. Engine Speed Does Not Return To Idle
(Light Braking D
4®D3)
SYMPTOM:
IEngine speed does not smoothly return to idle when A/T
shifts from D
4to D3.
IVehicle does not decelerate by engine brake when turning
overdrive control switch OFF.
IVehicle does not decelerate by engine brake when shifting
A/T from ªDº to ª2º position.
Does self-diagnosis show damage to
overrun clutch solenoid valve circuit after
cruise test?
No
EYe s
Check overrun clutch sole-
noid valve. Refer to AT-69.
Check throttle (accelerator) position sen-
sor. Refer to EC section [TROUBLE
DIAGNOSIS FOR ªTHROTTLE (ACCEL)
POSI SENº].
OK
ENG
Repair or replace throttle
(accelerator) position sen-
sor.
1. Remove oil pan.
2. Check A/T fluid condition.
OK
ENG
1. Remove control valve
assembly. Refer to
AT-113.
2. Check the following
items:
IOverrun clutch control
valve
IOverrun clutch reducing
valve
IOverrun clutch solenoid
valve
3. Disassemble A/T.
4. Check the following
items:
IOverrun clutch assembly
IOil pump assembly
1. Remove control valve assembly. Refer
to AT-113.
2. Check the following items:
IOverrun clutch control valve
IOverrun clutch reducing valve
IOverrun clutch solenoid valve
OK
FOK
Check again.
OK
ENG
1. Perform TCM input/
output signal inspection.
2. If NG, recheck TCM pin
terminals for damage or
loose connection with
harness connector.
INSPECTION END
YAT338
NAT262
SAT171B
H
H
H
H H
H
DIAGNOSTIC PROCEDURES FOR SYMPTOMS
AT-108

Revolution Sensor Replacement
1. Remove rear engine mounting member from side member
while supporting A/T with transfer case with jack. Tighten rear
engine mounting member to the specified torque. Refer to EM
section (ªENGINE REMOVALº).
2. Lower A/T with transfer case as much as possible.
3. Remove revolution sensor from A/T.
4. Reinstall any part removed.
IAlways use new sealing parts.
Rear Oil Seal Replacement
1. Remove transfer case from vehicle. Refer to TF section
(ªRemovalº, ªREMOVAL AND INSTALLATIONº).
2. Remove rear oil seal.
3. Install rear oil seal.
IApply ATF before installing.
4. Reinstall any part removed.
Parking Components Inspection
1. Remove propeller shaft. Refer to PD section (ªRemovalº, ªPRO-
PELLER SHAFTº).
2. Remove transfer case from vehicle. Refer to TF section
(ªRemovalº, ªREMOVAL AND INSTALLATIONº).
3. Remove manual control linkage bracket from adapter case.
4. Support A/T assembly with a jack.
5. Remove adapter case from transmission case.
6. Replace parking components if necessary.
7. Reinstall any part removed.
IAlways use new sealing parts.
Park/neutral Position Switch Adjustment
1. Remove manual control linkage from manual shaft of A/T
assembly.
2. Set manual shaft of A/T assembly in ªNº position.
3. Loosen park/neutral position switch fixing bolts.
4. Insert pin into adjustment holes in both park/neutral position
switch and manual shaft of A/T assembly as near vertical as
possible.
5. Reinstall any part removed.
6. Check continuity of park/neutral position switch. Refer to ªCom-
ponents Inspectionº, AT-92.
NAT278
NAT279
NAT280
SAT078B
NAT290
ON-VEHICLE SERVICE
AT-114

Removal
CAUTION:
When removing the A/T assembly from engine, first remove
the crankshaft position sensor (OBD) from the A/T assembly
upper side.
Be careful not to damage sensor edge.
1. Remove battery negative terminal.
2. Remove exhaust front tube.
3. Remove fluid charging pipe from A/T assembly.
4. Remove oil cooler pipe from A/T assembly.
5. Plug up openings such as the fluid charging pipe hole, etc.
6. Remove propeller shaft. Refer to PD section (ªRemovalº, ªPRO-
PELLER SHAFTº).
7. Remove transfer control linkage from transfer. Refer to TF sec-
tion (ªRemovalº, ªREMOVAL AND INSTALLATIONº).
8. Remove A/T control cable from A/T assembly.
9. Disconnect A/T and speedometer sensor harness connectors.
NAT284
REMOVAL AND INSTALLATION
AT-116

7. Check foreign materials in oil pan to help determine cause of
malfunction. If the fluid is very dark, smells burned, or contains
foreign particles, the frictional material (clutches, band) may
need replacement. A tacky film that will not wipe clean indicates
varnish build up. Varnish can cause valves, servo, and clutches
to stick and may inhibit pump pressure.
IIf frictional material is detected, replace radiator after
repair of A/T. Refer to LC section (ªRadiatorº, ªENGINE
COOLING SYSTEMº).
8. Remove torque converter clutch solenoid valve and A/T fluid
temperature sensor connectors.
IBe careful not to damage connector.
9. Remove oil strainer.
a. Remove oil strainer from control valve assembly then remove
O-ring from oil strainer.
b. Check oil strainer screen for damage.
10. Remove control valve assembly.
a. Straighten terminal clips to free terminal cords then remove
terminal clips.
SAT171B
NAT228
SAT008B
SAT025B
SAT009B
DISASSEMBLY
Disassembly (Cont'd)
AT-124