Suzuki GRAND VITARA Owner's Manual page 214

1A-159 Engine General Information and Diagnosis:
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine.
4) Check DTC and pending DTC.
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions For DTC Troubleshooting: ".
Step
1 Was "Engine and Emission Control System Check"
performed?
2 Signal circuit check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Measure voltage at terminal "C37-22" of ECM connector,
under following condition.
Voltage at terminal "C37-22" of ECM connector
While engine cranking: 6 – 14 V
After starting engine: 0 – 1 V
Is each voltage within specified range?
Action Yes
Go to Step 2.
Poor "C37-22"
connection or
intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
If wire and connections
are OK, substitute a
known-good ECM and
recheck.
No
Go to "Engine and
Emission Control
System Check: ".
"BLK/YEL" wire is open
or high resistance
circuit.