DTC P0123:00 [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]

id0102h9701900

DTC P0123:00

TP sensor No.1 circuit high input

DETECTION CONDITION

•  If the PCM detects that the TP sensor No.1 voltage at the PCM terminal 1BP is above 4.9 V, the PCM determines that the TP sensor No.1 circuit has a malfunction.

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Restricts the upper limit of the engine speed.

POSSIBLE CAUSE

•  Throttle body connector or terminals malfunction

•  PCM connector or terminals malfunction

•  TP sensor No.1 malfunction

•  Short to power supply in wiring harness between throttle body terminal A and PCM terminal 1BP

•  Open circuit in wiring harness between the following terminals:

―  Throttle body terminal B—PCM terminal 1BS

―  Throttle body terminal A—PCM terminal 1BP

―  Throttle body terminal D—PCM terminal 1BQ

•  PCM malfunction

DTC P0123:00	TP sensor No.1 circuit high input
DETECTION CONDITION	• If the PCM detects that the TP sensor No.1 voltage at the PCM terminal 1BP is above 4.9 V, the PCM determines that the TP sensor No.1 circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Restricts the upper limit of the engine speed.
POSSIBLE CAUSE	• Throttle body connector or terminals malfunction • PCM connector or terminals malfunction • TP sensor No.1 malfunction • Short to power supply in wiring harness between throttle body terminal A and PCM terminal 1BP • Open circuit in wiring harness between the following terminals: ― Throttle body terminal B—PCM terminal 1BS ― Throttle body terminal A—PCM terminal 1BP ― Throttle body terminal D—PCM terminal 1BQ • 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	DETERMINE IF TP SENSOR NO.1 OR WIRING HARNESS MALFUNCTION • Access the TP1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Verify the TP1 PID value. • Is the TP1 PID value 5 V or B+?	Yes	Go to Step 7.
3		No	Go to the next step.
4	INSPECT THROTTLE BODY CONNECTOR CONDITION • Switch the ignition off. • Disconnect the throttle body connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 10.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR CONDITION • 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 and/or terminals, then go to Step 10.
5		No	Go to the next step.
6	INSPECT TP SENSOR NO.1 • Reconnect all disconnected connectors. • Inspect the TP sensor No.1. (See THROTTLE POSITION (TP) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the throttle body, then go to Step 10. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
6		No	Go to Step 10.
7	DETERMINE IF TP SENSOR NO.1 SIGNAL CIRCUIT OR TP SENSOR NO.1 GROUND CIRCUIT MALFUNCTION • Switch the ignition off. • Disconnect the throttle body connector. • Access the TP1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Verify the TP1 PID value. • Is the TP1 PID value 5 V or B+?	Yes	Go to the next step.
7		No	Go to Step 9.
8	INSPECT TP SENSOR NO.1 SIGNAL CIRCUIT FOR OPEN CIRCUIT • Verify that the throttle body connector is disconnected. • Switch the ignition off. • Disconnect the PCM connector. • Inspect for continuity between throttle body terminal A (wiring harness-side) and PCM terminal 1BP (wiring harness-side). • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between throttle body terminal A and PCM terminal 1BP. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 10.
8		No	Refer to the wiring diagram and verify whether or not there is a common connector between throttle body terminal A and PCM terminal 1BP. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 10.
9	INSPECT TP SENSOR NO.1 CIRCUIT FOR OPEN CIRCUIT • Verify that the throttle body connector is disconnected. • Switch the ignition off. • Disconnect the PCM connector. • Inspect for continuity between the following terminals (wiring harness-side): ― Throttle body terminal B—PCM terminal 1BS ― Throttle body terminal D—PCM terminal 1BQ • Is there continuity?	Yes	Replace the throttle body, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
9		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Throttle body terminal B—PCM terminal 1BS • Throttle body terminal D—PCM terminal 1BQ If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to the next step.
10	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 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 [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) Go to the next step.
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
11		No	DTC troubleshooting completed.