Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 230 / 729

YH4
GRAND
VITARA
ENGINE (H25 ENGINE) 6-1-119
DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCE-
DURE.
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 ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE”.
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?
Go to Step 3. “B / Y” wire shorted
to power circuit.
3 Engine Start Signal check:
(1) While engine cranking, check voltage between
C51-2-26 and ground.
Is voltage 6 – 14 V?
Intermittent trouble.
If OK, substitute a
known-good ECM
(PCM) and recheck. “B / Y” wire open.
If OK, substitute a
known-good ECM
(PCM) and recheck.