DTC P0122 [ZY, Z6]


DTC P0122	TP sensor circuit low input
DETECTION CONDITION	• If the PCM detects that the TP sensor voltage at PCM terminal 2AA is less than 0.10 V while the engine is running, the PCM determines that the TP sensor 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. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• TP sensor malfunction • Connector or terminal malfunction • Open circuit in wiring harness between TP sensor terminal A and PCM terminal 2W • Short to GND in wiring harness between TP sensor terminal A and PCM terminal 2W • Open circuit in wiring harness between TP sensor terminal C and PCM terminal 2AA • Short to GND in wiring harness between TP sensor terminal C and PCM terminal 2AA • PCM malfunction


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 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 TP SENSOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the TP sensor 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 8.
3		No	Go to the next step.
4	INSPECT TP SENSOR CIRCUIT FOR SHORT TO GND • Turn the ignition switch off. • Inspect for continuity between the following terminals: - TP sensor terminal A (wiring harness-side) and body GND - TP sensor terminal C (wiring harness-side) and body GND • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to GND, then go to Step 8.
4		No	Go to the next step.
5	INSPECT TP SENSOR • Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION [ZY, Z6].) • Is there any malfunction?	Yes	Replace the TP sensor, then go to Step 8. (See THROTTLE POSITION (TP) SENSOR REMOVAL/INSTALLATION [ZY, Z6].)
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM 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 8.
6		No	Go to the next step.
7	INSPECT TP SENSOR CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the following terminals: - TP sensor terminal A (wiring harness-side) and PCM terminal 2W (wiring harness-side) - TP sensor terminal C (wiring harness-side) and PCM terminal 2AA (wiring harness-side) • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0122 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [ZY, Z6].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [ZY, Z6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ZY, Z6].)
9		No	DTC troubleshooting completed.