DTC P0123 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6804300

DTC P0123

Accelerator pedal position (APP) sensor No.2 signal above upper limit
DETECTION CONDITION
•  The PCM monitors the accelerator pedal depression amount based on the APP sensor No.2 signal using CAN via the instrument cluster. If the PCM detects that the APP sensor No.2 signal exceeds 4.95112 V, the PCM determines that the APP sensor No.2 signal is in error.
POSSIBLE CAUSE
•  Communication error between instrument cluster and PCM
•  APP sensor connector or terminals malfunction
•  Instrument cluster connector or terminals malfunction
•  Short to power supply in wiring harness between APP sensor terminal B and instrument cluster terminal 1D
•  APP sensor No.2 power supply circuit and signal circuit are shorted to each other
•  Open circuit in wiring harness between APP sensor terminal C and instrument cluster terminal 1G
•  APP sensor No.2 malfunction
•  Instrument cluster malfunction
•  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.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY STORED CAN COMMUNICATION DTC IN PCM AND INSTRUMENT CLUSTER
•  Retrieve the PCM and instrument cluster DTC using the M-MDS.
•  Is the CAN communication DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See DTC TABLE [INSTRUMENT CLUSTER].)
No
Go to the next step.
4
INSPECT APP SENSOR CONNECTOR CONDITION
•  Switch the ignition to OFF.
•  Disconnect the APP sensor 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.
No
Go to the next step.
5
INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Disconnect the instrument cluster 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.
No
Go to the next step.
6
INSPECT APP SENSOR NO.2 POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT TO EACH OTHER
•  APP sensor and instrument cluster connectors are disconnected.
•  Inspect for continuity between APP sensor 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 10.
No
Go to the next step.
7
INSPECT APP SENSOR NO.2 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  APP sensor and instrument cluster connectors are disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the APP sensor terminal B (wiring harness-side).
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 10.
No
Go to the next step.
8
INSPECT APP SENSOR NO.2 CIRCUIT FOR OPEN CIRCUIT
•  APP sensor and instrument cluster connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  APP sensor terminal A—instrument cluster terminal 1F
―  APP sensor terminal B—instrument cluster terminal 1D
•  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 10.
9
INSPECT APP SENSOR NO.2
•  Reconnect all disconnected connectors.
•  Inspect the APP sensor No.2)
•  Is there any malfunction?
Yes
Replace the accelerator pedal, then go to the next step.
(See ACCELERATOR PEDAL (APP) REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
No
Replace the instrument cluster, then go to the next step.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
10
VERIFY THAT DTC P0123 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
DTC troubleshooting completed.