1A-93 Engine General Information and Diagnosis:
5
Wire harness check
1) Disconnect ECT sensor connector with ignition switch
turned OFF.
2) Check for proper connection to ECT sensor connector at
“PPL/YEL” and “GRY/GRN” wire terminals.
3) If OK, then with ignition switch ON, measure voltage
between “PPL/YEL” wire terminal of ECT sensor
connector and vehicle body ground.
Is voltage about 4 – 6 V?
Go to Step 9.
Go to Step 6.
6
ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Check for proper connection of ECM connector at “C37-
24” terminal.
4) If OK, then turn ON ignition switch, measure voltage
between “C37-24” terminal of ECM connector and
vehicle body ground.
Is voltage about 4 – 6 V?
“PPL/YEL” wire is open
circuit.
If wire and connection
are OK, go to Step 7.
Go to Step 7.
7
Wire circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Turn ignition switch to ON position.
3) Measure voltage between “PPL/YEL” wire terminal of
ECT sensor connector and body ground.
Is voltage about 0 V?
Go to Step 8.
“PPL/YEL” wire is
shorted to other circuit.
If wire is OK, substitute
a known-good ECM and
recheck.
8
Wire circuit check
1) Measure resistance between “C37-24” terminal of ECM
connector and “PPL/YEL” wire terminal of ECT sensor
connector with ignition switch turned OFF.
Is resistance below 3
Ω
?
Go to Step 9.
“PPL/YEL” wire is high
resistance circuit.
9
Ground circuit check
1) Connect connectors to ECM.
2) Check for proper connection of ECT sensor connector at
“GRY/GRN” wire terminal.
3) Measure resistance between “GRY/GRN” wire terminal
of ECT sensor connector and vehicle body ground.
Is resistance below 3
Ω
?
Go to Step 11.
Go to Step 10.
Step
Action
Yes
No
I5JB0A110039-01
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