Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mazda >> 2010 >> 5 Touring, 2.3 L >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3] >> DTC P0117 >> Diagnostic procedure

Diagnostic procedure

DTC P0117 [L3] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) 
  • Is DTC P0117 on FREEZE FRAME DATA (Mode 2)?
Yes Go to the next step.
No Go to troubleshooting for DTC on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE .)
2 VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (Engine cooling system related) been recorded?
Yes Go to the next step.
No Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
3 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.
4 VERIFY ENGINE CONDITION 
  • Is the engine overheating?
Yes Perform symptom troubleshooting "No. 17 Cooling system concerns - Overheating". (See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING .)
No Go to the next step.
5 INSPECT TERMINAL BENT 
  • Turn the ignition switch off.
  • Disconnect the ECT sensor connector.
  • Inspect for bent of ECT sensor terminals A and B (part-side).
  • Is there any malfunction?
Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
6 CLASSIFY ECT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION 
  • Access PCM PID ECT using the M-MDS.
  • Verify ECT value when disconnecting ECT sensor connector.
  • Does the ECT value change?
Yes Replace the ECT sensor, then go to Step 10.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION .)
No Go to the next step.
7 INSPECT ECT SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Turn the ignition switch off.
  • Inspect for continuity between ECT sensor terminal A (wiring-harness-side) and body ground.
  • Is there continuity?
Yes If the short to ground circuit could be detected:
  • Repair or replace for a possible short to ground.

If the short to ground circuit could not be detected:

Then go to Step 10.
No Go to the next step.
8 INSPECT PCM TERMINAL 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
Yes Repair the terminal, then go to Step 10.
No Go to the next step.
9 INSPECT ECT CIRCUIT FOR SHORT WIRING HARNESSES 
  • ECT sensor and PCM connectors are disconnected.
  • Inspect for continuity between ECT sensor terminal A and B (wiring-harness-side).
  • Is there continuity?
Yes Repair or replace the wiring harness for short, then go to the next step.
No Go to the next step.
10 VERIFY TROUBLESHOOTING OF DTC P0117 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 KOEO/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.
11 VERIFY AFTER REPAIR PROCEDURE 
Yes Go to the applicable DTC troubleshooting.
(See DTC TABLE .)
No Troubleshooting completed.