LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2014 >> MX-5 Miata Sport, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System LF] >> DTC P2089
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P2089

DTC P2089  OCV circuit high input 
DETECTION CONDITION 
  • The PCM monitors the OCV voltage. If the PCM detects that the OCV control voltage (calculated from the OCV) is above the threshold voltage (calculated from battery positive voltage), the PCM determines that the OCV 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 
  • OCV connector or terminals malfunction
  • OCV malfunction
  • PCM connector or terminals malfunction
  • Short to power supply in wiring harness between OCV terminal A and PCM terminal 2E
  • PCM malfunction
G07877649
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 OCV CONNECTOR AND TERMINALS 
  • Turn the ignition switch off.
  • Disconnect the OCV 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 7.
No Go to the next step.
4 INSPECT OCV 
 Yes Replace the OCV, then go to Step 7.
(See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION ).
No Go to the next step.
5 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 7.
No Go to the next step.
6 INSPECT OCV CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • PCM connector is disconnected.
  • Disconnect the OCV connector.
  • Turn the ignition switch to the ON position (Engine off).
  • Measure the voltage between OCV terminal A (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 the next step.
No Go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P2089 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.
8 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals