Engine General Information and Diagnosis: 1A-161
DTC P2123: Throttle / Pedal Position Sensor / Switch “D” (Main) Circuit High Input
S7RS0B1104073
Wiring Diagram
Refer to “DTC P2122: Throttle / Pedal Position Sensor / Switch “D” (Main) Circuit Low Input”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.
6 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “E23-35” terminal of ECM
connector and engine ground.
Is resistance infinity?
Substitute a known-
good ECM and recheck.
“BRN” 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-
37”, “E23-52” and “E23-51” terminals.
3) If OK, measure resistance between “GRN” wire terminal
of APP sensor connector and vehicle body ground.
Is resistance infinity?
Go to Step 8. “GRN” wire is shorted to
ground circuit.
8 Wire harness check
1) Measure resistance between “E23-37” and each “E23-
52”, “E23-51”, “E23-50” terminals of ECM connector with
ignition switch turned OFF.
Is resistance infinity?
Go to Step 9. “GRN” wire is shorted to
“BLU” wire and/or
“WHT” wire and/or
“E23-50” circuit.
9 Wire harness check
1) Measure resistance between “GRN” wire terminal of
APP sensor connector and “E23-37” terminal of ECM
connector with ignition switch turned OFF.
Is resistance Below 5
Ω
?
Go to Step 10. “GRN” wire is open or
high resistance circuit.
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
DTC detecting condition Trouble area
Output voltage of APP sensor (main) is more than
specified value for 0.2 seconds continuously.
(1 driving detection logic)
• APP sensor (main) circuit
• APP sensor
•ECM
• Incorrect mounting of APP sensor
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