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DTC P0122 [L8, LF, L3]

id0102a1804200

DTC P0122 | TP sensor No.1 circuit low input
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DETECTION CONDITION | • If the PCM detects that the TP sensor voltage is below 0.2 V while the engine is running, 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 conditions in first drive cycles. • PENDING CODE is available if the PCM detects the above malfunction condition. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE | • TP sensor malfunction • Connector or terminal malfunction • Short to ground in wiring harness between TP sensor terminal A and PCM terminal 2AK • Open circuit in wiring harness between TP sensor terminal A and PCM terminal 2AK • Open circuit in wiring harness between TP sensor terminal B and PCM terminal 2AO • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service information. If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | CLASSIFY TP SENSOR OR WIRING HARNESS MALFUNCTION • Connect the 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 the voltage above 4.9 V? | Yes | Go to the next step.
No | Go to Step 5.
4 | INSPECT TP SENSOR • Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L8, LF, L3].) • Is TP sensor okay? | Yes | Inspect throttle body connector terminal B for poor connection. Repair or replace if necessary, then go to Step 8.
No | Replace the 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 CONSTANT VOLTAGE troubleshooting procedure. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage at throttle body terminal B (wiring harness-side). • Is the voltage within 4.5- 5.5 V? | Yes | Go to the next step.
No | Repair or replace for an 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 for 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.
No | Repair or replace the wiring harness, then go to Step 8.
7 | VERIFY TP1 SIGNAL CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between throttle body terminal A (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness, then go to the next step.
No | Go to the next step.
8 | VERIFY TROUBLESHOOTING OF DTC P0122 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 [L8, LF, L3].)
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.