DTC P0123 [L8, LF]

id0102b1804300

DTC P0123 | TP sensor No.1 circuit high input
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DETECTION CONDITION | • If the PCM detects the TP sensor No.1 voltage is to be above 4.9 V after turn the ignition switch to the ON position, the PCM determines that 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 condition 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 • PCM connector or terminals malfunction • Short to power supply in wiring harness between throttle body terminal F and PCM terminal 2AK • TP sensor No.1 power supply circuit and signal circuit are shorted to each other • Open circuit in wiring harness between the following terminals: ― Throttle body terminal F and PCM terminal 2AK ― Throttle body terminal C and PCM terminal 2AP • TP 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 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 | 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.
5 | INSPECT TP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • PCM connector is disconnected. • Disconnect the throttle body connector. • Turn the ignition switch to the ON position (engine off). • Measure the voltage between throttle body terminal F (wiring harness-side) and body ground. • Is there any voltage? | Yes | Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
No | Go to the next step.
6 | VERIFY TP SENSOR NO.1 POWER SUPPLY AND SIGNAL CIRCUIT FOR SHORT TO EACH OTHER • Throttle body and PCM connectors are disconnected. • Turn the ignition switch off. • Inspect for continuity between throttle body terminals E and F (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 TP SENSOR NO.1 CIRCUIT FOR OPEN CIRCUIT • Throttle body and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Throttle body terminal F and PCM terminal 2AK ― Throttle body terminal C and PCM terminal 2AP • 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 TP SENSOR NO.1 • Reconnect the throttle body connector. • Inspect the TP sensor No.1. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L8, LF]) • Is there any malfunction? | Yes | Replace the throttle body, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L8, LF].)
No | 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.