Engine General Information and Diagnosis: 1A-167
4 ECM voltage check
1) Disconnect connector from APP sensor with ignition
switch turned OFF.
2) Check for proper connection to APP sensor at “RED”,
“YEL” and “WHT” wire terminals.
3) If OK, measure voltage between “RED” wire terminal of
APP sensor 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-
34” terminal.
3) If OK, measure voltage between “E23-34” terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 0 V?
Substitute a known-
good ECM and recheck.
“RED” 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-
35”, “E23-36” and “E23-34” terminals.
3) If OK, measure resistance between “YEL” wire terminal
and each “BRN”, “RED” wire terminals of APP sensor
connector.
Is each resistance infinity?
Go to Step 7. “YEL” wire is shorted to
“BRN” wire and/or
“RED” wire.
7 Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between “E23-36” terminal of ECM
connector and engine ground.
Is voltage 0 V?
Go to Step 8. “YEL” wire is shorted to
power circuit.
8 Ground circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Measure resistance between “WHT” wire terminal of
APP sensor connector and vehicle body ground.
Is resistance below 5
Ω
?
Go to Step 10. Go to Step 9.
Step Action Yes No
"GRN"
"BLU"
"BRN"
"YEL"
"WHT"
"RED"
I4RS0B110048-01
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