DTC P2122 [L8, LF]

id0102b1811700

DTC P2122 | APP sensor No.1 circuit low input
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DETECTION CONDITION | • The PCM monitors the input voltage from APP sensor No.1 when the engine is running. If the input voltage is less than 0.35 V, the PCM determines that the APP sensor No.1 circuit input voltage is low. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • APP sensor connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― APP sensor terminal D and PCM terminal 1AL ― APP sensor terminal F and PCM terminal 1AO • PCM connector or terminals malfunction • APP sensor No.1 signal circuit and ground circuit are shorted to each other • Open circuit in wiring harness between the following terminals: ― APP sensor terminal D and PCM terminal 1AL ― APP sensor terminal F and PCM terminal 1AO • APP sensor No.1 malfunction • 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 APP SENSOR CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the APP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, 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 | INSPECT APP SENSOR NO.1 CIRCUIT FOR SHORT TO GROUND • APP sensor connector is disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― APP sensor terminal D ― APP sensor 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, 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 | INSPECT APP SENSOR NO.1 SIGNAL AND GROUND CIRCUIT FOR SHORT TO EACH OTHER • APP sensor and PCM connectors are disconnected. • Inspect for continuity between APP sensor terminals F and E (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.
7 | INSPECT APP SENSOR NO.1 CIRCUIT FOR OPEN CIRCUIT • APP sensor and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― APP sensor terminal D and PCM terminal 1AL ― APP sensor terminal F and PCM terminal 1AO • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for a possible open circuit, then go to Step 9.
8 | INSPECT APP SENSOR NO.1 • Reconnect the APP sensor and PCM connectors. • Inspect the APP sensor No.1. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Replace the APP sensor, then go to the next step. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
9 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • 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.