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Home >> Mazda >> 2014 >> MX-5 Miata Club, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System LF] >> DTC P2128

DTC P2128

DTC P2128  APP sensor No. 2 circuit high input 
DETECTION CONDITION 
  • The PCM monitors the input voltage from APP sensor No. 2 when the engine is running. If the input voltage is more than 4.8 V  , the PCM determines that the APP sensor No. 2 circuit has a malfunction.

Diagnostic support note 
  • This is a continuous monitor (CCM).
  • The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
  • FREEZE FRAME DATA (Mode 2/Mode 12) is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • APP sensor connector or terminals malfunction
  • PCM connector or terminals malfunction
  • Short to power supply in wiring harness between APP sensor terminal C and PCM terminal 1 AP
  • APP sensor No. 2 power supply circuit and signal circuit are shorted to each other
  • Open circuit in wiring harness between APP sensor terminal B and PCM terminal 1AV
  • APP sensor No. 2 malfunction
  • PCM malfunction
G07877654
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED 
  • Has the FREEZE FRAME DATA (Mode 12) been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2 VERIFY RELATED SERVICE BULLETINS AVAILABILITY 
  • Verify related Service Bulletins availability.
  • Is any related Service Bulletins available?
 Yes Perform the repair or diagnosis according to the available Service Bulletins.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 INSPECT APP SENSOR CONNECTOR AND TERMINALS 
  • 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 connector or terminals, then go to Step 9.
No Go to the next step.
4 INSPECT PCM CONNECTOR AND TERMINALS 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals, then go to Step 9.
No Go to the next step.
5 INSPECT APP SENSOR NO. 2 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • APP sensor and PCM connectors are disconnected.
  • Turn the ignition switch to the ON position (Engine off).
  • Measure the voltage between APP sensor terminal C (wiring harness-side) and body ground.
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
No Go to the next step.
6 INSPECT APP SENSOR NO. 2 SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER 
  • APP sensor and PCM connectors are disconnected.
  • Turn the ignition switch off.
  • Inspect for continuity between APP sensor terminals A and C (wiring harness-side).
  • Is there continuity?
 Yes Repair or replace the wiring harness for a possible short to each other, then go to Step 9.
No Go to the next step.
7 INSPECT APP SENSOR NO. 2 GROUND CIRCUIT FOR OPEN CIRCUIT 
  • APP sensor and PCM connectors are disconnected.
  • Inspect for continuity between APP sensor terminal B (wiring harness-side) and PCM terminal 1AV (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 Step 9.
8 INSPECT APP SENSOR NO. 2 
 Yes Replace the APP sensor, then go to the next step.
(See ACCELERATOR PEDAL REMOVAL/INSTALLATION ).
No Go to the next step.
9 VERIFY TROUBLESHOOTING OF DTC P2128 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Perform the KOEO or KOER self test.

    (See KOEO/KOER SELF TEST ).

  • 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.
10 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
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