NO. 10 LOW ENGINE COOLANT TEMPERATURE INDICATOR LIGHT/HIGH ENGINE COOLANT TEMPERATURE WARNING LIGHT ILLUMINATES OR FLASHES CONTINUOUSLY [INSTRUMENT CLUSTER]

id0903d5858200

10

Low engine coolant temperature indicator light/High engine coolant temperature warning light illuminates or flashes continuously.
POSSIBLE CAUSE
•  PCM malfunction
•  Instrument cluster malfunction
•  Connector or pin malfunction
•  Short circuit in wiring harness between CAN-L, CAN-H and ground
•  Open circuit in CAN wiring harness (CAN-L, CAN-H)
•  CAN wiring harness (CAN-L, CAN-H) short each other

Diagnostic procedure

STEP

INSPECTION

RESULT

ACTION
1
•  Retrieve the DTC of instrument cluster using M-MDS.
•  Is the DTC detected?
Yes
Go to applicable DTC troubleshooting procedure.
(See DTC TABLE [INSTRUMENT CLUSTER].)
No
Go to the next step.
2
•  Cool down the engine.
•  Switch the ignition to ON.
•  Verify the high engine coolant temperature warning light condition.
•  Does the high engine coolant temperature warning light illuminate or flash for 3— 30 s after the engine switch is turned to ON position?
Yes
Go to the next step.
No
Go to Step 5.
3
•  Monitor the PCM PID ECT using the M-MDS.
•  Is the PID ECT monitoring value for following value?
MZR 1.5, MZR 1.6, MZR 2.0, MZR 2.5, MZR 2.0 DISI i-stop, MZR 2.3 DISI Turbo, MZR-CD 2.2
―  Above 120 °C {248 °F} when high engine coolant temperature warning light flashes.
―  Above 125 °C {257 °F} when high engine coolant temperature warning light illuminates.
MZ-CD 1.6
―  Above 115 °C {239 °F} when high engine coolant temperature warning light flashes.
―  Above 120 °C {248 °F} when high engine coolant temperature warning light illuminates.
SKYACTIV-G 2.0
―  Above 122 °C {252 °F}when high engine coolant temperature warning light flashes.
―  Above 127 °C {261 °F} when high engine coolant temperature warning light illuminates.
Yes
Go to the next step.
No
Go to Step 5.
4
•  Start the engine.
•  Monitor PCM PID ECT using the M-MDS.
•  Verify the low engine coolant temperature indicator light condition when the ECT monitoring value above 55 °C {131°F} [MZR 1.5, MZR 1.6, MZR 2.0, MZR 2.5, MZR 2.0 DISI i-stop, MZR 2.3 DISI Turbo, SKYACTIV-G 2.0], 40 °C {131°F} [MZ-CD 1.6, MZR-CD 2.2]
•  Does the low engine coolant temperature indicator light illuminate?
Yes
Go to the next step.
No
Troubleshooting is completed. (The system is normal.)
5
•  Do the speedometer and tachometer indicate correct?
Yes
Go to the next step.
No
Go to Step 7.
6
•  Turn on and off both low engine coolant temperature indicator light/high engine coolant temperature warning light using M-MDS instrument cluster active command modes WL+IL.
•  Does both low engine coolant temperature indicator light/high engine coolant temperature warning light turn on and off according to active command modes?
Yes
Inspect the ECT sensor.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.5, MZR 1.6].)
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 2.0, MZR 2.5].)
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 2.3 DISI Turbo].)
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR-CD 2.2].)
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZ-CD 1.6].)
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G 2.0].)
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 2.0 DISI i-stop].)
No
Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
7
•  Disconnect the negative battery cable.
•  Measure the resistance between the DLC-2 terminals F and E.
•  Is the resistance below 60 ohms?
Yes
Go to the next step.
No
Go to Step 9.
8
•  Disconnect the negative battery cable.
•  Inspect the DLC-2 terminals F and E for short to power supply or ground.
•  Is there any malfunction?
Yes
Inspect the wiring harness and CAN system-related module.
Repair or replace the malfunctioning part.
No
Replace the instrument cluster.
9
•  Switch the ignition to off.
•  Inspect the instrument cluster connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Are the terminals normal?
Yes
Go to the next step.
No
Repair or replace the terminal.
10
•  Disconnect the negative battery cable.
•  Measure the resistance between the instrument cluster connector terminals 2B and 2D.
•  Is the resistance 114—126 ohms?
Yes
Inspect the wiring harness and CAN system-related module.
Repair or replace the malfunctioning part.
No
Replace the instrument cluster.