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Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2 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.
3 INSPECT ECT SENSOR CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the ECT sensor connector
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 8.
No Go to the next step
4 VERIFY PID DATA FOR ECT SENSOR MALFUNCTION 
  • Connect the M-MDS to the DLC-2.
  • Access the ECT PID using the M-MDS.
  • Connect a jumper wire between ECT sensor terminals A and B (wiring harness-side).
  • Is the voltage 4.6 V or below?
 Yes Replace the ECT sensor, then go to Step 8.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [L5] .)
No Go to the next step.
5 INSPECT PCM CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 8.
No Go to the next step
6 INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Reconnect the disconnected connectors.
  • Switch the ignition to ON (engine off).
  • Measure the voltage between ECT sensor terminal A (wiring harness-side) and body ground.
  • Is the voltage above 4.6 V?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No Go to the next step.
7 INSPECT ECT SENSOR CIRCUIT FOR OPEN CIRCUIT 
  • Switch the ignition to off.
  • Inspect for continuity between the following terminals:
    • ECT sensor terminal A (wiring harness-side) and PCM terminal 2AH (wiring harness-side)
    • ECT sensor terminal B (wiring harness-side) and PCM terminal 2AY (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 the next step.
8 VERIFY DTC TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Perform the KOEO/KOER self test.

    (See KOEO/KOER SELF TEST [L5] .)

  • Is the same DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L5] .)
No Go to the next step
9 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [L5] .)
No DTC troubleshooting completed.
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