Engine General Information and Diagnosis: 1A-165
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 7. Go to Step 5.
5 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 “E23-
34” terminal.
4) If OK, measure voltage between “E23-34” terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 4 – 6 V?
“RED” wire is open or
high resistance circuit.
Go to Step 6.
6 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “E23-34” terminal of ECM
connector and engine ground.
Is resistance infinity?
Substitute a known-
good ECM and recheck.
“RED” 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-
36”, “E23-52” and “E23-51” terminals.
3) If OK, measure resistance between “YEL” wire terminal
of APP sensor connector and vehicle body ground.
Is resistance infinity?
Go to Step 8. “YEL” wire is shorted to
ground circuit.
8 Wire harness check
1) Measure resistance between “E23-36” and each “E23-
52”, “E23-51”, “E23-50” terminals of ECM connector with
ignition switch turned OFF.
Is each resistance infinity?
Go to Step 9. “YEL” wire is shorted to
“BLU” wire and/or
“WHT” wire and/or
“E23-50” circuit.
9 Wire harness check
1) Measure resistance between “YEL” wire terminal of APP
sensor connector and “E23-36” terminal of ECM
connector with ignition switch turned OFF.
Is resistance below 5
Ω
?
Go to Step 10. “YEL” wire is open or
high resistance circuit.
Step Action Yes No
"GRN"
"BLU"
"BRN"
"YEL"
"WHT"
"RED"
I4RS0B110048-01
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