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Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> Transmission >> Automatic Trans >> On-Board Diagnostic - Automatic Transaxle (Mm8AX-EC) >> DTC P0C23-00: Electric At Oil Pump: Circuit Malfunction

DTC P0C23-00: Electric At Oil Pump: Circuit Malfunction

System malfunction location Electric AT oil pump: Circuit malfunction
Detection condition
  • The TCM detects an electric AT oil pump relay circuit malfunction.

    Precondition 

  • Battery voltage is the standard or more.
Fail-safe
  • Inhibits switching from engine-only driving to EV driving. (With Mazda M Hybrid boost)
  • Inhibits i-stop control. (Without Mazda M Hybrid boost)
Possible cause
  1. Electric AT oil pump relay malfunction (Refer to [RELAY INSPECTION ] in service information).
  2. Malfunction in wiring harness (including connector/terminal) between electric AT oil pump relay and TCM (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .)
  3. Control valve body malfunction (TCM malfunction) (Refer to [CONTROL VALVE BODY REMOVAL/INSTALLATION ] in service information).
Repeatability verification procedure
  1. Clear the DTC recorded in the memory. (See CLEARING DTC .)
  2. Perform the following procedure to ensure that the DTC has been resolved:
    • Drive the vehicle under the following condition:
      • Vehicle speed: 30 km/h {19 mph} or more
G16689590Courtesy of MAZDA MOTORS CORP.
1 Battery
2 Electric AT oil pump relay
3 TCM