DTC P2128[LF ATX (FN4A-EL), L3 ATX]

id0102b6812000

DTC P2128

Accelerator pedal position (APP) sensor No.2 circuit high input
DETECTION CONDITION
•  The PCM monitors the input voltage from APP sensor No.2 when the engine is running. If the input voltage is more than6 V for 1s, the PCM determines that the APP sensor No.2 circuit has malfunction.
Diagnostic support note
•  This is a continuous monitor (CCM).
•  The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  APP sensor No.2 malfunction
•  Connector or terminal malfunction
•  Open circuit in wiring harness between APP sensor terminal F and main relay
•  Open circuit in wiring harness between APP sensor terminal D and body ground
•  Open circuit in wiring harness between APP sensor terminal E and PCM terminal 1AL
•  Short to power supply in wiring harness between APP sensor terminal E and PCM 1AL
•  PCM 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.
No
Record the 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.
No
Go to the next step.
3
INSPECT APP SENSOR CONNECTOR FOR POOR CONNECTION
•  Turn the ignition switch 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 terminal, then go to Step 8.
No
Go to the next step.
4
INSPECT APP SENSOR NO.2 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Turn the ignition switch to the ON position (Engine off).
•  Measure the voltage between APP sensor terminal E and body ground.
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No
Go to the next step.
5
INSPECT APP SENSOR NO.2
•  Inspect APP sensor No.2.
•  Is there any malfunction?
Yes
Replace the APP sensor, then go to Step 8.
(See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION[LF, L3].)
No
Go to the next step.
6
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).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
7
INSPECT APP SENSOR NO.2 GROUND CIRCUIT FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Inspect for continuity between the following circuits:
―  APP sensor terminal D and body ground
―  APP sensor terminal E and PCM 1AL
―  APP sensor terminal F and main relay
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P2128 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION[LF, L3].)
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Is any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE[LF ATX (FN4A-EL), L3 ATX].)
No
DTC troubleshooting completed.