LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2011 >> RX-8 R3, 1.3 4 >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P1680
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

DTC P1680

DTC P1680 OCV circuit low input
DETECTION CONDITION 
  • The PCM monitors input voltage from the OCV. If the voltage of the OCV input terminal is less than the specification for 1 s  when the battery voltage is more than 10 V, the PCM determines the OCV circuit voltage is low.

Diagnostic support note 
  • This is a continuous monitor (other).
  • The MIL does not illuminate.
  • FREEZE FRAME DATA (Mode 2/Mode 12) is not available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • OCV connector or terminals malfunction
  • Short to ground or open circuit in OCV power supply circuit
    • Short to ground in wiring harness between main relay terminal C and OCV terminal B
    • OCV related fuse malfunction
    • Open circuit in wiring harness between main relay terminal C and OCV terminal B
  • Short to ground in wiring harness between OCV terminal A and PCM terminal 2E
  • PCM connector or terminals malfunction
  • Open circuit in wiring harness between OCV terminal A and PCM terminal 2E
  • OCV malfunction
  • PCM malfunction
G07878136
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify 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.
2 INSPECT OCV CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the OCV connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector and/or terminals, then go to Step 8.
No Go to the next step.
3 INSPECT OCV POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT 
  • OCV connector is disconnected.
  • Turn the ignition switch to the ON position (engine off).
  • Measure the voltage between OCV terminal B (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Inspect the OCV related fuse.
  • If the fuse is melt:
    • Repair or replace the wiring harness for a possible short to ground.
    • Replace the fuse.
  • If the fuse is deterioration:
    • Replace the fuse.
  • If the fuse is normal:
    • Repair or replace the wiring harness for a possible open circuit.

Go to Step 8.
4 INSPECT OCV CONTROL CIRCUIT FOR SHORT TO GROUND 
  • OCV connector is disconnected.
  • Turn the ignition switch off.
  • Inspect for continuity between OCV terminal A (wiring harness-side) and body ground.
  • Is there continuity?
 Yes If the short to ground circuit could be detected:
  • Repair or replace the wiring harness for a possible short to ground.

If the short to ground circuit could not be detected:
Go to Step 8.
No Go to the next step.
5 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector and/or terminals, then go to Step 8.
No Go to the next step.
6 INSPECT OCV CONTROL CIRCUIT FOR OPEN CIRCUIT 
  • OCV and PCM connectors are disconnected.
  • Turn the ignition switch off.
  • Inspect for continuity between OCV terminal A (wiring harness-side) and PCM terminal 2E (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 8.
7 INSPECT OCV 
 Yes Replace the OCV, then go to the next step.
(See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION ).
No Go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P1680 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.

    (See AFTER REPAIR PROCEDURE ).

  • Perform the 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.
9 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals