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Home >> Mazda >> 2017 >> CX-9 Signature >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Control System (3 Of 5) >> DTC P2184-00; ECT Sensor No. 2 Circuit Low Input >> Diagnostic Procedure
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Diagnostic Procedure

DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION
NOTE:
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the FREEZE FRAME DATA/snapshot data on the repair order.
 - 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
  • Reconnect all disconnected connectors.
  • Access the ECT2_V PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)] .)
  • Verify the ECT2_V PID value when disconnecting the ECT sensor No. 2 connector.
  • Does the ECT2_V PID value change?
 Yes Replace the ECT sensor No. 2, then go to Step 8.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
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 1CZ

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 [PCM (SKYACTIV-G 2.5T)] .)
No DTC troubleshooting completed.
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