2001 SUZUKI GRAND VITARA body

ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-83
TROUBLESHOOTING
Fig. for Steps 2 and 3Step Action Yes No
1 Was “ENGINE DIAG. FLOW TABLE” per-
formed?Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE” in this
section.
2 Knock sensor and its circuit check :
1) With engine running, check voltage from
“C51-3-3” terminal of ECM connector to
body ground. See Fig.
Is voltage about 0.90 – 3.98 V?Knock sensor and its cir-
cuit are in good condition.
Intermittent trouble or
faulty ECM.
Recheck, referring to
“INTERMITTENT TROU-
BLE” in Section 0A.Go to Step 3.
3 Knock sensor power source circuit check :
1) Stop engine.
2) With ignition switch at OFF position, discon-
nect knock sensor connector.
3) With ignition switch at ON position, check
voltage from “WHT” to body ground terminal
of knock sensor connector. See Fig.
Is it 4 – 5 V?Substitute a known-good
knock sensor and
recheck.“WHT” wire open, shorted
to ground circuit or poor
“C51-3-3” connection.
If wire and connection are
OK, substitute a known-
good substitute a known-
good ECM and recheck.
1. Knock sensor
2. Knock sensor connector

6-1-108 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
DTC P0505 Idle Air Control System Malfunction
SYSTEM/WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
1. Throttle body 3. ECM (PCM) 5. FIA valve 7. Main relay
2. Idle air control valve 4. Sensed information 6. Main fuse
DTC DETECTING CONDITION TROUBLE AREA
•Engine idle speed is 100 r/min. or more lower than target idle
speed for longer than 20 sec. continuously.
or
•Engine idle speed is 200 r/min or more higher than target
idle speed for longer than 20 sec. continuously.
(2 driving cycle detection logic)•IAC valve or its circuit
•Abnormal air drawn in air intake system
•FIA (fast idle air) valve

6-1-110 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
DTC P0601 (DTC No.71) Internal Control Module Memory Check Sum Error
SYSTEM DESCRIPTION
Internal control module is installed in ECM (PCM).
DTC DETECTING CONDITION AND TROUBLE AREA
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Start engine and run it at idle if possible.
4) Check DTC by using scan tool.
TROUBLESHOOTING
Substitute a known-good ECM (PCM) and recheck.6 Was idle speed higher than specification in
Step 2?Check FIA valve for mal-
function.
Check abnormal air inhal-
ing from intake manifold,
throttle body, PCV valve
and EVAP canister purge
control system.Check parts or system
which can cause engine
low idle.
Check FIA valve for stuck.
Air inhaling from between
throttle body and MAF
sensor, EGR valve mal-
function (leakage from
valve seat), accessory
engine load, clog of idle
air passage, engine
mechanical, engine over-
heat and etc. Step Action Yes No
DTC DETECTING CONDITION TROUBLE AREA
Data write error or check sum error ECM (PCM)

ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-121
Table B-4 Idle Air Control System Inspection
WIRING DIAGRAM
INSPECTION
1. Throttle body 3. ECM (PCM) 5. Main fuse
2. Idle air control valve 4. Sensed information 6. Main relay
Step Action Yes No
1 Check engine idle speed and IAC duty
referring to “IDLE SPEED/IAC DUTY
INSPECTION” in Section 6E2.
Is idle speed/IAC duty within specifica-
tion?Go to Step 2. Go to Step 3.
2 Is engine idle speed kept specified speed
even with headlights turned ON?System is in good condition. Go to Step 3.

6-1-122 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
3 Check IAC valve referring to “IAC VALVE
INSPECTION” in Section 6E2.
Is check result as specified?Go to Step 4. IAC valve malfunction, “BLU/
BLK”, “LT GRN/BLK”, “PPL/
BLK”, “GRY/BLU” or “PPL/
YEL” wire open or short or
poor coupler connection.
If all above are OK, substi-
tute a known-good ECM
(PCM) and recheck.
4 Was idle speed within specification in
Step 1?Check for following :
FIA valve, Vacuum leaks, air inhal-
ing, EVAP canister purge control
system, accessory engine load,
stuck of PCV valve, clog of idle air
passage, MAF sensor, TP sensor,
ECT sensor, EGR valve malfunc-
tion (leakage from valve seat), A/C
signal, transmission range switch
signal and power steering switch
signal.Go to Step 5.
5 Was idle speed higher than specification
in Step 1?Go to Step 6. Go to Step 8.
6 Check A/C (input) signal circuit referring
to Step 1 of “Table B-5”. (A/C signal can
be also checked by using SUZUKI scan
tool.)
Is it in good condition?Go to Step 7. A/C signal circuit open or
short, or A/C system mal-
function.
7 Was IAC duty less than about 2% in Step
1 of this table?
Check FIA valve.
Check abnormal air inhaling from
intake manifold, throttle body, PCV
valve and EVAP canister purge
control system.Check TP sensor (closed
throttle position) and ECT
sensor for performance.
If sensors are OK, substitute
a known-good ECM (PCM)
and recheck.
8 Check transmission range switch signal
referring to “INSPECTION OF ECM
(PCM) AND ITS CIRCUIT” in this section.
Is check result satisfactory?Go to Step 9. Transmission range switch
malfunction or its circuits
open or short.
9 Was IAC duty more than about 30% in
Step 1 of this table?Check parts or system which can
cause engine low idle.
Check FIA valve.
Air inhaling from between throttle
body and MAF sensor, EGR valve
malfunction (leakage from valve
seat), accessory engine load, clog
of idle air passage and etc.Substitute a known-good
ECM (PCM) and recheck. Step Action Yes No

ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-125
Special Tool
09912-58441 09912-58431 09912-58490 09912-58421
Pressure gauge Pressure hose 3-way joint & hose Checking tool set
(See NOTE “A”.)
09917-47011 09930-88521 09931-76011
Vacuum pump gauge Injector test lead Tech 1A kit (SUZUKI scan
tool) (See NOTE “B”.)Mass storage cartridge for
Tech 1A
09931-76030
14/16 pin DLC cable for
Tech 1ATech 2 kit (SUZUKI scan
tool) (See NOTE “C”.)
NOTE:
“A”: This kit includes the following items.
1. Tool body & washer, 2. Body plug, 3. Body attachment-1, 4. Holder,
5. Return hose & clamp, 6. Body attachment-2 & washer, 7. Hose attachment-1,
8. Hose attachment-2
“B”: This kit includes the following items and substitutes for the Tech 2 kit.
1. Storage case, 2. Operator’s manual, 3. Tech 1A, 4. DLC cable,
5. Test lead/probe, 6. Power source cable, 7. DLC cable adaptor, 8. Self-test adaptor
“C”: This kit includes the following items and substitutes for the Tech 1A kit.
1. Tech 2, 2. PCMCIA card, 3. DLC cable, 4. SAE 16/19 adapter, 5. Cigarette cable, 6. DLC loopback
adapter, 7. Battery power cable, 8. RS232 cable, 9. RS232 adapter, 10. RS232 loopback connector,
11. Storage case, 12. Power supply

ENGINE MECHANICAL (H27 ENGINE) 6A2-1
6A2
SECTION 6A2
ENGINE MECHANICAL (H27 ENGINE)
CONTENTS
On-Vehicle Service........................................6A2-2
Throttle Body and Intake Manifold .............. 6A2-2
Exhaust Manifold ......................................... 6A2-9
LH (No.1) Bank 2nd Timing Chain
and Chain Tensioner ................................. 6A2-13
Camshaft and Valve Lash Adjuster ........... 6A2-14
Valves and Cylinder Heads ....................... 6A2-17
Piston, Piston Rings, Connecting Rodsand Cylinders ............................................ 6A2-21
Unit Repair Overhaul .................................. 6A2-26
Engine Assembly ...................................... 6A2-26
Main Bearings, Crankshaft
and Cylinder Block .................................... 6A2-30
Special Tool ................................................. 6A2-36

WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System:
Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).
NOTE:
For the descriptions (items) not found in this section, refer to the same section of service manual
mentioned in the FOREWORD of this manual.
Whether following systems (parts) are used in the particular vehicle or not depends on specifica-
tions. Be sure to bear this in mind when performing service work.
–EGR valve
–Warm up three way catalytic converter
–Heated oxygen sensor(s)
–Three way catalytic converter
–CKP sensor
–MAP sensor

6A2-2 ENGINE MECHANICAL (H27 ENGINE)
On-Vehicle Service
Throttle Body and Intake Manifold
1. Air cleaner box 6. Intake manifold 11. Gasket 16. Throttle body bolt
2. Intake air hose 7. Intake manifold gasket 12. IAT sensor Tightening Torque
3. Intake air pipe 8. Throttle body assembly 13. MAF sensor Do not reuse
4. Surge tank pipe 9. Throttle body gasket 14. MAP sensor
5. Gasket 10. Intake collector 15. Throttle body nut