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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (AJ]DTC P2123 [AJ]DIAGNOSTIC PROCEDURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Diagnostic procedure

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnostic procedure
DTC P2123 [AJ] 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 FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or on-line 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 APP sensor connector.
  • Check for poor connection (such as damaged, pulled-out pins, and 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.1 SIGNAL CIRCUIT FOR SHORT TO POWER 
  • Turn the ignition switch to the ON position.
  • Measure voltage between APP sensor terminal F and body ground.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power, then go to Step 8.
No Go to the next step.
5 INSPECT APP SENSOR NO.1 
 Yes Replace accelerator pedal, then go to Step 8.
(See ACCELERATOR PEDAL REMOVAL/INSTALLATION [AJ] ).
No Go to the next step.
6 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Check for poor connection (such as damaged, pulled-out pins, and 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.1 GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Check continuity between APP sensor terminal E and PCM terminal 1X.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P2123 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear DTC from PCM memory using M-MDS.
  • Perform the KOEO or KOER SELF TEST using the M-MDS.

    (See KOEO/KOER SELF TEST [AJ] ).

  • Is the PENDING CODE same DTC present?
 Yes Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [AJ] ).
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [AJ] ).
No Troubleshooting completed.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.