DTC P0123:00 [MZR 2.0, MZR 2.5]

id0102g3701900

DTC P0123:00

TP sensor No.1 circuit high input

DETECTION CONDITION

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

Diagnostic support note

•  This is a continuous monitor (CCM).

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

•  FREEZE FRAME DATA (Mode 2)/Snapshot data 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 circuit in wiring harness between throttle body terminal A and PCM terminal 2AK

•  TP sensor No.1 signal circuit and power supply circuit are shorted to each other

•  Open circuit in wiring harness between throttle body terminal D and PCM terminal 2AN

•  TP sensor No.1 malfunction

•  PCM malfunction

DTC P0123:00	TP sensor No.1 circuit high input
DETECTION CONDITION	• If the PCM detects the TP sensor No.1 voltage is to be above 4.85 V after switch the ignition to ON, PCM determines that TP sensor circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data 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 circuit in wiring harness between throttle body terminal A and PCM terminal 2AK • TP sensor No.1 signal circuit and power supply circuit are shorted to each other • Open circuit in wiring harness between throttle body terminal D and PCM terminal 2AN • TP sensor No.1 malfunction • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot 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 THROTTLE BODY CONNECTOR CONDITION • Switch the ignition to 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 terminal and/or connector, then go to Step 9.
3		No	Go to the next step.
4	INSPECT PCM CONNECTOR CONDITION • 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 terminal and/or connector, then go to Step 9.
4		No	Go to the next step.
5	INSPECT TP SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Throttle body and PCM connectors are disconnected. • Switch the ignition to ON (engine off). • Measure the voltage between throttle body terminal A (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.
5		No	Go to the next step.
6	INSPECT TP SENSOR NO.1 SIGNAL CIRCUIT AND POWER SUPPLY CIRCUIT FOR SHORT TO EACH OTHER • Throttle body and PCM connectors are disconnected. • Switch the ignition to off. • Inspect for continuity between throttle body terminals A and B (wiring harness-side). • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to each other, then go to Step 9.
6		No	Go to the next step.
7	INSPECT TP SENSOR NO.1 GROUND CIRCUIT FOR OPEN CIRCUIT • Throttle body and PCM connectors are disconnected. • Inspect for continuity between throttle body terminal D (wiring harness-side) and PCM terminal 2AN (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
7		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 and PCM connectors. • Inspect the TP sensor No.1. (See THROTTLE POSITION (TP) SENSOR INSPECTION [MZR 2.0, MZR 2.5].) • Is there any malfunction?	Yes	Replace the throttle body, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
8		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 [MZR 2.0, MZR 2.5].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [MZR 2.0, MZR 2.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 2.0, MZR 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.0, MZR 2.5].)
10		No	DTC troubleshooting completed.