DTC P2127

BHE010202100W10

DTC P2127

APP sensor No.2 circuit low input

DETECTION CONDITION

• The PCM monitors the input voltage from the APP sensor No.2 when the engine is running. If the input voltage is less than 0.3 V, the PCM determines that the APP sensor No.2 circuit input voltage is low.

Diagnostic support note

• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• 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 A and PCM terminal 4X
• Short to GND in wiring harness between APP sensor terminal A and PCM terminal 4X
• Open circuit in wiring harness between APP sensor terminal C and PCM terminal 5C
• Short to GND in wiring harness between APP sensor terminal C and PCM terminal 5C
• 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 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

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 CIRCUIT FOR SHORT TO GND

• Turn the ignition switch off.
• Inspect for continuity between the following circuits:
– APP sensor terminal A (wiring harness-side) and body GND
– APP sensor terminal C (wiring harness-side) and body GND
• Is there any continuity?
Yes
Repair or replace the wiring harness for a possible short to GND, then go to Step 8.
No
Go to the next step.
5

INSPECT APP SENSOR NO.2

• Inspect the APP sensor No.2.
• Is there any malfunction?
Yes
Replace the APP sensor, then go to Step 8.
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 CIRCUIT FOR OPEN CIRCUIT

• Turn the ignition switch off.
• Inspect for continuity between the following circuits:
– APP sensor terminal A (wiring harness-side) and PCM terminal 4X (wiring harness-side)
– APP sensor terminal C (wiring harness-side) and PCM terminal 5C (wiring harness-side)
• 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 P2127 COMPLETED

• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
9

VERIFY AFTER REPAIR PROCEDURE

• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE.)
No
DTC troubleshooting completed.