Suzuki SX4 Service Manual page 136

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1A-86 Engine General Information and Diagnosis:
Step
6
ECT sensor harness resistance check
1) Measure resistance between "C01-24" terminal of ECM
connector and "LT GRN" wire terminal of ECT sensor
connector with ignition switch turn OFF.
Is resistance below 5
7
ECT sensor ground circuit check
1) Connect connectors to ECM.
2) Check for proper connection of ECT sensor connector at
"GRY/BLU" wire terminal.
3) Measure resistance between "GRY/BLU" wire terminal
of ECT sensor connector and vehicle body ground.
Is resistance below 5
8
ECT sensor ground circuit check
1) Measure resistance between "C01-55" terminal of ECM
connector and vehicle body ground.
Is resistance below 5
9
ECT sensor for performance check
1) Check ECT sensor according to "Engine Coolant
Temperature (ECT) Sensor Inspection in Section 1C".
Is it in good condition?
Action
?
?
?
Yes
Go to Step 7.
Go to Step 9.
"GRY/BLU" wire is open
circuit or high resistance
circuit. Poor "C01-55"
connection.
Substitute a known-
good ECM and recheck.
No
"LT GRN" wire is high
resistance circuit.
Go to Step 8.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
Replace ECT sensor.

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