1A-199 Engine General Information and Diagnosis:
4
ECM voltage check
1) Disconnect connector from accelerator pedal position
(APP) sensor assembly with ignition switch turned OFF.
2) Check for proper connection to accelerator pedal
position (APP) sensor assembly at “WHT”, “WHT/BLU”
and “ORN” wire terminals.
3) If OK, measure voltage between “WHT” wire terminal of
accelerator pedal position (APP) sensor assembly
connector and vehicle body ground with ignition switch
turned ON.
Is voltage 4 – 6 V?
Go to Step 6.
Go to Step 5.
5
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “E23-
56” terminal.
3) If OK, measure voltage between “E23-56” terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 0 V?
Substitute a known-
good ECM and recheck.
“WHT” wire is shorted to
power circuit.
6
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at “E23-
56”, “E23-55” and “E23-53” terminals.
3) If OK, measure resistance between “WHT/BLU” wire
terminal and each “WHT”, “ORN/BLU” wire terminals of
accelerator pedal position (APP) sensor assembly
connector.
Is each resistance infinity?
Go to Step 7.
“WHT/BLU” wire is
shorted to “WHT” wire
and/or “ORN/BLU” wire.
7
Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between “E23-55” terminal of ECM
connector and engine ground.
Is voltage 0 V?
Go to Step 8.
“WHT/BLU” wire is
shorted to power circuit.
8
Ground circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Measure resistance between “ORN” wire terminal of
accelerator pedal position (APP) sensor assembly
connector and vehicle body ground.
Is resistance below 3
Ω
?
Go to Step 10.
Go to Step 9.
Step
Action
Yes
No
“BLU/GRN”
“BLU/YEL”
“ORN”
“WHT/BLU”
“WHT”
“ORN BLU”
I5JB0A110071-01
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