1A-197 Engine General Information and Diagnosis:
6 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “E23-56” terminal of ECM
connector and engine ground.
Is resistance infinity?
Substitute a known-
good ECM and recheck.
“WHT” wire is shorted to
ground circuit.
7 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “E23-
55”, “E23-54” and “E23-51” terminals.
3) If OK, measure resistance between “WHT/BLU” wire
terminal of accelerator pedal position (APP) sensor
assembly connector and vehicle body ground.
Is resistance infinity?
Go to Step 8. “WHT/BLU” wire is
shorted to ground
circuit.
8 Wire harness check
1) Measure resistance between “E23-55” and each “E23-
54”, “E23-51” terminals of ECM connector with ignition
switch turned OFF.
Is each resistance infinity?
Go to Step 9. “WHT/BLU” wire is
shorted to “ORN” wire
and/or “BLU/YEL” wire
circuit.
9 Wire harness check
1) Measure resistance between “WHT/BLU” wire terminal
of accelerator pedal position (APP) sensor assembly
connector and “E23-55” terminal of ECM connector with
ignition switch turned OFF.
Is resistance below 5
Ω
?
Go to Step 10. “WHT/BLU” wire is open
or high resistance
circuit.
10 Accelerator pedal position (APP) sensor assembly
check
1) Check accelerator pedal position sensor (main) referring
to “Accelerator Pedal Position (APP) Sensor Assembly
Removal and Installation: in Section 1C”.
Is output voltage within specified value?
Substitute a known-
good ECM and recheck.
Replace accelerator
pedal position (APP)
sensor assembly.
Step Action Yes No
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