DTC P2127 [L3 Turbo]

id0102b7811900

DTC P2127

Accelerator pedal position (APP) sensor No.2 circuit low input
DETECTION CONDITION
•  The PCM monitors the APP sensor No.2 signal. If the PCM detects that the APP sensor No.2 voltage is below 0.2 V, the PCM determines that the APP sensor No.2 circuit has a malfunction.
Diagnostic support note
•  This is a continuous monitor (CCM).
•  MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA is available.
•  DTCs are stored in the PCM memory.
POSSIBLE CAUSE
•  Connector or terminal malfunction
•  APP sensor malfunction
•  Open circuit between APP sensor terminal C and PCM terminal 1AC
•  Open circuit between APP sensor terminal A and PCM terminal 1AJ
•  Short to ground circuit between APP sensor terminal C and PCM terminal 1AC
•  Short to ground circuit between APP sensor terminal A and PCM terminal 1AJ
•  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 FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SEIVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related repair information available?
Yes
Perform the 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
CLASSIFY APP SENSOR OR HARNESS MALFUNCTION
•  Connect the M-MDS.
•  Access the APP2 PID.
•  Disconnect the throttle body connector.
•  Connect a jumper wire between APP sensor terminals A and C (wiring harness-side).
•  Is the PID approx. 100%?
Yes
Go to the next step.
No
Go to step 5.
4
INSPECT APP SENSOR
•  Perform the APP sensor inspection.
•  Is the APP sensor normal?
Yes
Inspect for poor APP sensor connector terminal A connection. Repair or replace if necessary, then go to Step 8.
No
Replace the APP sensor, then go to Step 8.
5
INSPECT POWER SUPPLY CIRCUIT VOLTAGE AT APP SENSOR CONNECTOR
•  Turn ignition switch to the ON position (Engine off).
•  Measure the voltage at APP sensor terminal A (wiring harness-side).
•  Is the voltage within 4.5—5.5 V?
Yes
Go to the next step.
No
Repair or replace for an open circuit between APP sensor connector terminal A (wiring harness-side) and PCM connector terminal 1AJ (wiring harness-side).
Then, then go to Step 8.
6
VERIFY APP2 SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Turn the ignition switch to off.
•  Inspect for continuity between APP sensor terminal C (wiring harness-side) and PCM terminal 1AC (wiring harness-side).
•  Inspect for continuity between APP sensor terminal A (wiring harness-side) and PCM terminal 1AJ (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the suspected wiring harness, then go to Step 8.
7
VERIFY APP2 SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Inspect for continuity between APP sensor terminal C (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the suspected wiring harness, then go to the next step.
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P2127 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Turn ignition switch to the ON position (Engine off).
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start engine and warm it up completely.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(SeePCM REMOVAL/INSTALLATION [L3 Turbo].)
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.
(SeeDTC TABLE [L3 Turbo].)
No
Troubleshooting completed.