Diagnostic Procedure

DTC P0123 DIAGNOSTIC PROCEDURE TABLE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT THROTTLE BODY CONNECTION FOR POOR CONNECTION Disconnect the throttle body connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 9.
3		No	Go to the next step.
4	INSPECT TP SENSOR NO.1 Inspect the TP sensor No.1. (See THROTTLE POSITION (TP) SENSOR INSPECTION .) Is the TP sensor No.1 okay?	Yes	Go to the next step.
4		No	Replace the throttle body, then go to Step 9. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION .)
5	INSPECT TP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY Turn the ignition switch to the ON position (Engine off). Measure the voltage between throttle body terminal F (wiring harness-side) and body ground. Is the voltage above 4.9 V ?	Yes	Repair or replace for a short to power supply. Then, go to Step 9.
5		No	Go to the next step.
6	VERIFY TP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT Inspect for continuity between throttle body terminals E and F (wiring harness-side). Is there continuity?	Yes	Repair or replace suspected wiring harness, then go to Step 9.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair the terminal, then go to Step 9.
7		No	Go to the next step.
8	VERIFY TP SENSOR NO.1 GROUND CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between throttle body terminal C (wiring harness-side) and PCM terminal 2AP (wiring harness-side). Is there continuity?	Yes	Repair or replace for an open circuit between TP sensor No.1 terminal C (wiring harness-side) and PCM terminal 2AP (wiring harness-side). Then, go to the step.
8		No	Go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position (Engine off). Clear the DTC from the PCM memory using the WDS or equivalent. Start the engine and warm it up completely. 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 .) Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
10		No	Troubleshooting completed.