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DTC P2128 [L3 With TC]: Notes

DTC P2128 [L3 WITH TC] DETECTION CONDITION AND POSSIBLE CAUSE

DTC P2128 Accelerator pedal position (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 6.5 V  for 1s  , the PCM determines that the APP sensor No. 2 circuit has malfunction.

Diagnostic support note 
  • This is a continuous monitor (CCM).
  • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
  • PENDING CODE is available if the PCM detects the above malfunction condition.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • APP sensor No. 2 malfunction
  • Connector or terminal malfunction
  • Open circuit in wiring harness between APP sensor terminal F and main relay
  • Open circuit in wiring harness between APP sensor terminal D and PCM terminal 1U
  • Open circuit in wiring harness between APP sensor terminal E and PCM terminal 1 AC
  • Short to power supply in wiring harness between APP sensor terminal E and PCM 1 AC
  • PCM malfunction
G04954413Courtesy of MAZDA MOTORS CORP.
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