Diagnostic Procedure

DTC P0122 DIAGNOSTIC PROCEDURE

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 FREEZE FRAME DATA on repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or online 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	CLASSIFY TP SENSOR OR HARNESS MALFUNCTION Connect WDS or equivalent. Access TP1 PID. Disconnect throttle body connector. Connect a jumper wire between throttle body terminals A and B (wiring harness-side). Is voltage above 4.9 V ?	Yes	Go to the next step.
3		No	Go to step 5.
4	INSPECT TP SENSOR Perform TP sensor inspection. (See THROTTLE POSITION (TP) SENSOR INSPECTION ). Is TP sensor normal?	Yes	Inspect for poor throttle body connector terminal B connection. Repair or replace if necessary, then go to Step 8.
4		No	Replace throttle body, then go to Step 8.
5	INSPECT POWER SUPPLY CIRCUIT VOLTAGE AT THROTTLE BODY CONNECTOR NOTE: If DTC P0107 and P2228 are also retrieved with P0122, go to troubleshooting procedure. Turn ignition switch to ON (Engine off). Measure voltage at throttle body terminal B (wiring harness-side). Is voltage within 4.5-5.5 V ?	Yes	Go to the next step.
5		No	Repair or replace open circuit between throttle body connector terminal B (wiring harness-side) and PCM connector terminal 2AO (wiring harness-side). Then, then go to Step 8.
6	VERIFY TP1 SIGNAL CIRCUIT FOR OPEN CIRCUIT Turn the ignition switch off. Inspect continuity between throttle body terminal A (wiring harness-side) and PCM terminal 2AK (wiring harness-side). Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace suspected harness, then go to Step 8.
7	VERIFY TP1 SIGNAL CIRCUIT FOR SHORT TO GROUND Inspect continuity between throttle body terminal A (wiring harness-side) and body ground. Inspect continuity between throttle body terminal B (wiring harness-side) and body ground. Is there continuity?	Yes	Repair or replace suspected harness, then go to the next step.
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0122 COMPLETED Make sure to reconnect all disconnected connectors. Turn ignition switch to ON (Engine off). Clear the DTC from the PCM memory using the WDS or equivalent. Start engine and warm it up completely. Is same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	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 ).
9		No	Troubleshooting completed.