Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 276

DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
• Intake air temperature : between –14°C and 70°C (6.8°F and 158°F)
• Atmospheric pressure : higher than 560 mmHg (Altitude : lower than 2790 m (9150 ft))
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and run it for 5 min.
4) Check DTC and pending DTC by using scan tool.
DTC TROUBLESHOOTING
Step
1 Was "Engine Diag. Flow Table" performed?
2 Engine Start Signal check :
1) Remove ECM (PCM) cover.
2) While engine running, check voltage
between C51-2-26 and ground.
Is voltage 0 – 1 V?
3 Engine Start Signal check :
1) While engine cranking, check voltage
between C51-2-26 and ground.
Is voltage 6 – 14 V?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE) 6-1-135
Action Yes
Go to Step 2.
Go to Step 3.
Intermittent trouble.
If OK, substitute a known-
good ECM (PCM) and
recheck.
No
Go to "Engine Diag. Flow
Table".
"BLK/YEL" wire shorted to
power circuit.
"BLK/YEL" wire open.
If OK, substitute a known-
good ECM (PCM) and
recheck.