DTC P0123:00 [MZI-3.7]

id0102d2701900

DTC P0123:00

TP sensor No.1 circuit high input

DETECTION CONDITION

•  The TP sensor No.1 circuit was flagged as a concern by the PCM indicating a high voltage.

POSSIBLE CAUSE

•  Connector or terminal malfunction

•  Short to constant voltage supply circuit between throttle body terminal F and PCM terminal 2AN

•  TP sensor signal circuits are shorted each other

•  TP sensor No.1 malfunction

DTC P0123:00	TP sensor No.1 circuit high input
DETECTION CONDITION	• The TP sensor No.1 circuit was flagged as a concern by the PCM indicating a high voltage.
POSSIBLE CAUSE	• Connector or terminal malfunction • Short to constant voltage supply circuit between throttle body terminal F and PCM terminal 2AN • TP sensor signal circuits are shorted each other • TP sensor No.1 malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has 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 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 TP SENSOR CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the throttle body connector. • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion). • Are there any malfunction?	Yes	Repair or replace suspected part, then go to Step 8.
3		No	Go to the next step.
4	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion). • Are there any malfunction?	Yes	Repair or replace suspected part, then go to Step 8.
4		No	Go to the next step.
5	INSPECT TP SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Throttle body and PCM connectors are disconnected. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between throttle body connector terminal F (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace suspected part, then go to Step 8.
5		No	Go to the next step.
6	INSPECT TP SENSOR SIGNAL CIRCUITS FOR SHORT EACH OTHER • Throttle body and PCM connectors are disconnected. • Turn the ignition switch off. • Measure resistance between throttle body connector terminal D and F • Is the resistance more than 10 kilohms?	Yes	Go to the next step.
6		No	Repair or replace suspected part, then go to Step 8.
7	INSPECT TP SENSOR NO.1 • Inspect the TP sensor No.1. (See THROTTLE POSITION (TP) SENSOR INSPECTION [MZI-3.7].) • Are there any malfunction?	Yes	Replace the throttle body, then go to the next step.
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P0123:00 HAS BEEN COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
9		No	Troubleshooting completed.