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Home >> Mazda >> 2007 >> 6 Mazdaspeed >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3 With TC] >> DTC P2127 >> Diagnostic procedure
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Diagnostic procedure

DTC P2127 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 REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair 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 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 
 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.
(See PCM REMOVAL/INSTALLATION ).
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No Troubleshooting completed.
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