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 DTC P2127 [L3 Turbo]

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

• APP sensor malfunction
• Connector or terminal malfunction
• Open circuit between APP sensor terminal C and PCM terminal 2A
• Short to ground circuit between APP sensor terminal C and PCM terminal 2A
• Open circuit between APP sensor terminal A and PCM terminal 2K

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS 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 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
CLASSIFY APP SENSOR OR HARNESS MALFUNCTION
• Connect the WDS or equivalent.
• Access the APP2 PID.
• Disconnect the throttle body connector.
• Connect a jumper wire between APP sensor terminals A and C (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 (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 and PCM connector terminal 2K (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 (harness-side) and PCM terminal 2A (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 (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 WDS or equivalent.
• Start engine and warm it up completely.
• 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.
No
Troubleshooting completed.