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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1318 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT POWER SUPPLY VOLTAGE USING WDS OR EQUIVALENT 
  • Turn the ignition switch off.
  • Connect the WDS or equivalent to the DLC-2.
  • Turn the ignition switch to the ON position (engine off).
  • Access B+ PID.
  • Is the voltage normal?
 Yes Malfunction may be temporary. Go to Step 6.
No Go to the next step.
2 INSPECT BATTERY  Yes Go to the next step.
No Repair or replace the battery, then go to Step 6.
(See BATTERY REMOVAL/INSTALLATION .)
3 INSPECT GENERATOR  Yes Go to the next step.
No Repair or replace the generator, then go to Step 6.
(See GENERATOR REMOVAL/INSTALLATION .)
4 INSPECT WHETHER MALFUNCTION IS CAUSED BY POOR CONNECTION OF EPS CONTROL MODULE OR PIN DEFORMATION 
  • Turn the ignition switch off.
  • Inspect connection of the EPS control module and wiring harness.
  • Disconnect the EPS control module connector.
  • Inspect whether malfunction is caused by bent or poorly connected EPS control module connector pin.
  • Are the connector connection, connector pins, and wiring harness normal?
 Yes Go to the next step.
No Repair or replace the malfunction connector wiring harness, then go to Step 6.
5 INSPECT EPS CONTROL MODULE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND 
  • Disconnect the battery positive terminal.
  • Inspect for continuity between EPS control module terminal 2P and ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for short to ground between EPS control module terminal 2P and ground, then go to Step 6.
No Go to the next step.
6 VERIFY TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the memory.

    (See CLEARING DTCS PROCEDURE .)

  • Turn the ignition switch off.
  • Start the engine.
  • Is the same DTC present?
 Yes Replace the EPS control module, then go to the next step. (See EPS CONTROL MODULE REMOVAL/INSTALLATION .)
No Go to the next step.
7 VERIFY AFTER REPAIR PROCEDURE 
  • Are any other DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No DTC troubleshooting completed.
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