DTC P0123[L3 Turbo]

id0102b7804300

DTC P0123

TP sensor No.1 circuit high input

DETECTION CONDITION

•  If the PCM detects that the TP sensor No.1 voltage is above 4.85 V after ignition switch to the ON position, PCM determines that TP circuit has a malfunction.

Diagnostic support note

•  This is a continuous monitor (CCM).

•  MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA is available.

•  DTCs are stored in the PCM memory.

POSSIBLE CAUSE

•  TP sensor malfunction

•  Connector or terminal malfunction

•  Open circuit between throttle body terminal B and PCM terminal 2AO

•  Open circuit between throttle body terminal D and PCM terminal 2AP

•  Short to the constant voltage supply circuit between throttle body terminal A and PCM terminal 2AK

•  PCM malfunction

DTC P0123	TP sensor No.1 circuit high input
DETECTION CONDITION	• If the PCM detects that the TP sensor No.1 voltage is above 4.85 V after ignition switch to the ON position, PCM determines that TP circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • DTCs are stored in the PCM memory.
POSSIBLE CAUSE	• TP sensor malfunction • Connector or terminal malfunction • Open circuit between throttle body terminal B and PCM terminal 2AO • Open circuit between throttle body terminal D and PCM terminal 2AP • Short to the constant voltage supply circuit between throttle body terminal A and PCM terminal 2AK • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA 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 the repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT THROTTLE BODY CONNECTOR • Turn the ignition switch off. • Verify that the throttle body connector is connected securely. • Is connector normal?	Yes	Go to the next step.
3		No	Connect the connector securely, then go to Step 10.
4	INSPECT THROTTLE BODY CONNECTION FOR POOR CONNECTION • Disconnect throttle body connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the suspected wiring terminal, then go to Step 10.
4		No	Go to the next step.
5	INSPECT TP SENSOR • Perform the TP sensor inspection. (See THROTTLE POSITION (TP) SENSOR INSPECTION[L3 Turbo]) • Is the TP sensor normal?	Yes	Go to the next step.
5		No	Replace the throttle body, then go to Step 10.
6	INSPECT TP1 SIGNAL CIRCUIT FOR OPEN CIRCUIT • Turn ignition switch to the ON position (Engine off). • Measure the voltage between throttle body terminal B (harness-side) and body ground. • Is the voltage above 4.9 V?	Yes	Go to the next step.
6		No	Repair or replace for short to a power supply. Then, go to Step 10.
7	VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between throttle body connector terminal D (harness-side) and PCM connector terminal 2AP. • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace for an open circuit between TP sensor connector terminal B (harness-side) and PCM connector terminal 3P (harness-side). Then, go to Step 10.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair terminal, then go to Step 10.
8		No	Go to Step 10.
9	VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT • Inspect for continuity between throttle body terminals A and B (harness-side). • Is there continuity?	Yes	Repair or replace the suspected wiring harness, then go to the next step.
9		No	Go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0123 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the M-MDS. • Start the engine and warm it up completely. • Is same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION[L3 Turbo].)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE[L3 Turbo].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE[L3 Turbo].)
11		No	Troubleshooting completed.