Engine General Information and Diagnosis: 1A-163
6 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “E23-
35”, “E23-37” and “E23-34” terminals.
3) If OK, measure resistance between “GRN” wire terminal
and each “BRN”, “RED” wire terminals of APP sensor
connector.
Is each resistance infinity?
Go to Step 7. “GRN” wire is shorted to
“BRN” wire and/or
“RED” wire.
7 Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between “E23-37” terminal of ECM
connector and engine ground.
Is voltage 0 V?
Go to Step 8. “GRN” wire is shorted to
power circuit.
8 Ground circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Measure resistance between “BLU” wire terminal of APP
sensor connector and vehicle body ground.
Is resistance below 5
Ω
?
Go to Step 10. Go to Step 9.
9 Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Check for proper connection of ECM connector at “E23-
52” terminal.
3) If OK, measure resistance between “E23-52” terminal of
ECM connector and engine ground.
Is resistance below 5
Ω
?
“BLU” wire is open or
high resistance circuit.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
10 APP sensor check
1) Check APP sensor (main) referring to “APP Sensor
Assembly Removal and Installation in Section 1C”.
Is output voltage within specified value?
Substitute a known-
good ECM and recheck.
Replace APP sensor.
Step Action Yes No
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