DTC P0123


DTC P0123	TP circuit high input
DETECTION CONDITION	• If the PCM detects that the TP sensor voltage at PCM terminal 2AA is more than 4.9 V after the ignition switch is turned to On, the PCM determines that the TP circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • The PENDING CODE is available if the PCM detects the above malfunction condition. • The FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• TP sensor malfunction • Connector or terminal malfunction • Open circuit between TP sensor terminal B and PCM terminal 2AE • Open circuit between TP sensor terminal C and PCM terminal 2AA • Short to power circuit between TP sensor terminal C and PCM terminal 2AA


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is the same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2	INSPECT TP SENSOR CONNECTOR • Turn the ignition switch off. • Verify that the TP sensor connector is connected securely. • Is the connector normal?	Yes	Go to the next step.
2		No	Connect the connector securely, then go to Step 9.
3	INSPECT TP SENSOR FOR POOR CONNECTION • Disconnect the TP sensor connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected terminal, then go to Step 9.
3		No	Go to the next step.
4	INSPECT TP SENSOR • Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION.) • Is the TP sensor normal?	Yes	Go to the next step.
4		No	Replace the TP sensor, then go to Step 9.
5	INSPECT TP SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER • Turn the ignition switch to the ON position. (Engine off). • Measure the voltage between TP sensor terminal C (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace for a short to the power circuit, then go to Step 9.
5		No	Go to the next step.
6	VERIFY TP SIGNAL CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect the continuity between TP sensor terminal C (wiring harness-side) and PCM terminal 2AA (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the suspected wiring harness, then go to Step 9.
7	VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the continuity between TP sensor terminal B (wiring harness-side) and PCM terminal 2AE (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
7		No	Repair the terminal, then go to Step 9.
8	INSPECT PCM CONNECTOR • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair the terminal, then go to Step 9.
8		No	Go to Step 9.
9	VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the KOEO/KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE.)
10		No	Troubleshooting completed.