Suzuki Grand Vitara Service Manual page 173

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 IMT vacuum solenoid valve power supply circuit check
1) Turn OFF ignition switch and disconnect connector from
IMT vacuum solenoid valve.
2) Measure voltage between engine ground and "BLU/
BLK" wire terminal of IMT vacuum solenoid valve
connector with ignition switch turned ON.
Is it voltage 10 – 14 V?
3 Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "C37-33" terminal of ECM
connector and vehicle body ground.
Is resistance infinity?
4 Wire circuit check
1) Measure voltage between "C37-33" terminal of ECM
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 0 V?
5 Wire circuit check
1) Connect connector to IMT vacuum solenoid valve with
ignition switch turned OFF.
2) Turn ON ignition switch and measure voltage between
"C37-33" terminal of ECM connector and vehicle body
ground.
Is it voltage 10 – 14 V?
6 IMT vacuum solenoid valve check
1) Check for coil resistance of IMT vacuum solenoid valve
referring to "Vacuum Tank Assembly Inspection (For J20
Engine): in Section 1C".
Is it in good condition?
7 IMT vacuum solenoid circuit check
1) With ignition switch turn OFF, measure resistance
between "E23-1/16" terminal and "C37-33" terminal of
ECM connector.
Is resistance below 40
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Action
Ω ° °
at 20 C, 68 F?
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Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Faulty ECM. Substitute
a known-good ECM and
recheck.
1A-166
No
Go to "Engine and
Emission Control
System Check: ".
"BLU/BLK" wire is open
circuit.
"GRY/RED" wire is
shorted to ground
circuit.
"GRY/RED" wire is
shorted to other circuit.
"GRY/RED" wire is open
circuit.
Faulty IMT vacuum
solenoid valve.
"GRY/RED" and/or
"BLU/BLK" wire are high
resistance circuit.