DTC P0122 [L8, LF]

id0102b1804200

DTC P0122 | TP sensor No.1 circuit low input
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DETECTION CONDITION | • If the PCM detects that the TP sensor No.1 voltage is below 0.1 V while the engine is running, the PCM determines that the TP sensor No.1 circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction conditions during first drive cycles. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Throttle body connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― Throttle body terminal E and PCM terminal 2AO ― Throttle body terminal F and PCM terminal 2AK • PCM connector or terminals malfunction • TP sensor No.1 malfunction • TP sensor No.1 signal circuit and ground circuit are shorted to each other • Open circuit in wiring harness between throttle body terminal E and PCM terminal 2AO • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 12) been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE 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 | INSPECT THROTTLE BODY CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the throttle body connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 9.
No | Go to the next step.
4 | VERIFY TP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO GROUND • Throttle body connector is disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Throttle body terminal E ― Throttle body terminal F • Is there continuity? | Yes | If the short to ground circuit could be detected: • Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: • Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION [L8, LF].) Go to Step 9.
No | Go to the next step.
5 | INSPECT PCM CONNECTOR AND TERMINALS • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 9.
No | Go to the next step.
6 | CLASSIFY TP SENSOR NO.1 OR WIRING HARNESS MALFUNCTION • Reconnect the PCM connector. • Connect the M-MDS. • Perform the PID/DATA Monitor and Record Procedure and access the TP1 PID. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Connect a jumper wire between throttle body terminals E and F (wiring harness-side). • Is the voltage above 4.9 V? | Yes | Replace the throttle body, then go to Step 9. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
7 | VERIFY TP SENSOR NO.1 SIGNAL AND GROUND CIRCUIT FOR SHORT TO EACH OTHER • Throttle body connectors is disconnected. • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for continuity between throttle body terminal F and C (wiring harness-side). • Is there continuity? | Yes | Repair or replace the suspected wiring harness, then go to Step 9.
No | Go to the next step.
8 | VERIFY TP SENSOR NO.1 SIGNAL CIRCUIT FOR OPEN CIRCUIT • Throttle body and PCM connectors are disconnected. • Inspect for continuity between throttle body terminal E (wiring harness-side) and PCM terminal 2AO (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9 | VERIFY DTC TROUBLESHOOTING 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 M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Start the engine and warm it up completely. • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [L8, LF].) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.