Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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6-110 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
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 and warm up
engine completely.
3) Run engine at idle speed for 1 min.
4) Check DTC and pending DTC by using scan tool.
TROUBLESHOOTING (P0505)
NOTE:
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temp. : –8°C, 18°F or higher
• Engine coolant temp. : –8 – 110°C (18 – 230°F)
• Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
Step Action Yes No
1 Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Table”.
2 Idle Speed Check :
1) Check engine idle speed referring to “Idle
Speed/Idle Air Control Duty Inspection” in
Section 6E1.
Is engine idle speed within specification?
Intermittent trouble or
faulty ECM (PCM).
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0A. Go to Step 3.
3 IAC Valve Check :
1) Check IAC valve referring to “IAC Valve” in
Section 6E1.
Is check result as specified?
Go to Step 6. Go to Step 4.
4 IAC Valve Circuit Check :
1) With ignition switch OFF, disconnect ECM
(PCM) couplers.
2) Check for proper connection to IAC valve at
C51-2-3, C51-2-12, C51-2-11 and C51-2-10
terminals.
3) If OK, check resistance between C51-2-3
and C51-2-12, C51-2-10 and C51-2-11.
Is each resistance 70 – 86
Ω?
Go to Step 5. “LT GRN/BLK”, “PPL/
BLK”, “GRY/BLU” or
“PPL/YEL” wire open or
short.
If wire and connections
are OK, replace IAC
valve.
5 IAC Valve Power Supply Voltage Check :
1) Connect ECM (PCM) couplers.
2) With ignition switch OFF, disconnect coupler
of IAC valve.
3) With ignition switch ON, check voltage
between C29-2 (“BLU/BLK” wire terminal of
IAC valve coupler) and ground, C29-5
(“BLU/BLK” wire terminal of IAC valve cou-
pler) and ground.
Is each voltage 10 – 14 V?
IAC valve or ECM (PCM)
malfunction. Open “BLU/BLK” wire.