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Home >> Mazda >> 2014 >> 3 SV, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Controls (5 Of 6) >> DTC P2184 00: ECT Sensor No. 2 Circuit Low Input >> Diagnostic Procedure

Diagnostic Procedure

DTC P2184:00 (SKYACTIV-G 2.0, SKYACTIV-G 2.5) - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) been recorded?
Yes Go to the next step.
No Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the 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 NO. 2 CONNECTOR CONDITION 
  • Switch the ignition off.
  • Disconnect the ECT sensor No. 2 connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, 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.
4 DETERMINE IF ECT SENSOR NO. 2 OR WIRING HARNESS MALFUNCTION 
Yes Replace the ECT sensor No. 2, then go to Step 8.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
No Go to the next step.
5 INSPECT PCM CONNECTOR CONDITION 
  • Switch the ignition 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 connector and/or terminals, then go to Step 8.
No Go to the next step.
6 INSPECT ECT SENSOR NO. 2 SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Verify that the PCM connector is disconnected.
  • Disconnect the ECT sensor No. 2 connector.
  • Inspect for continuity between ECT sensor No. 2 terminal A (wiring harness-side) and body ground.
  • Is there continuity?
Yes Refer to the wiring diagram and verify whether or not there is a common connector between ECT sensor No. 2 terminal A and PCM terminal 2F.
If there is a common connector: 
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Repair or replace the malfunctioning part.

If there is no common connector: 
  • Repair or replace the wiring harness which has a short to ground.

Go to Step 8.
No Go to the next step.
7 INSPECT ECT SENSOR NO. 2 SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER 
  • Verify that the ECT sensor No. 2 and PCM connectors are disconnected.
  • Inspect for continuity between ECT sensor No. 2 terminals A and B (wiring harness-side).
  • Is there continuity?
Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • ECT sensor No. 2 terminal A-PCM terminal 2F
  • ECT sensor No. 2 terminal B-PCM terminal 2AJ

If there is a common connector: 
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other.
  • Repair or replace the malfunctioning part.

If there is no common connector: 
  • Repair or replace the wiring harness which has a short to each other.

Go to the next step.
No Go to the next step.
8 VERIFY DTC TROUBLESHOOTING COMPLETED 
Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE 
Yes Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
No DTC troubleshooting completed.