DTC P0118 [MZR-CD (RF Turbo)]

BME010200100W29

DTC P0118

ECT sensor circuit high input

DETECTION CONDITION

• PCM monitors input voltage from ECT sensor while engine is running. If input voltage from ECT sensor is above 5.0 V, PCM determines ECT sensor circuit high input.

POSSIBLE CAUSE

• ECT sensor malfunction
• Connector or terminal malfunction
• Short to power circuit in wiring between ECT sensor terminal A and PCM terminal 87
• Open circuit in wiring between ECT sensor terminal A and PCM terminal 87
• Open circuit in wiring between ECT sensor terminal B and PCM terminal 91
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform "DTC Confirmation Procedure".
• Is same DTC present during KOEO or KOER self-test?
Yes
Go to next step.
No
Intermittent concern exists. Go to "Intermittent Concern Troubleshooting".
2
INSPECT POOR CONNECTION OF ECT SENSOR CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 7.
No
Go to next step.
3
CLASSIFY ECT SENSOR MALFUNCTION OR HARNESS MALFUNCTION
• Turn engine switch to ON (Engine OFF).
• Connect jumper wire between ECT sensor connector terminals.
• Access ECT PID using WDS or equivalent.
• Is ECT PID below 1.0 V?
Yes
Replace ECT sensor, go to Step 7.
No
Go to next step.
4
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn engine switch to ON (Engine OFF).
• Inspect voltage between ECT sensor terminal A and body GND.
• Is voltage below 1.0 V?
Yes
Go to next step.
No
Repair or replace harness for short to power, go to Step 7.
5
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 7.
No
Go to next step.
6
INSPECT ECT SENSOR CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between following harnesses:
- ECT sensor terminal A and PCM terminal 87.
- ECT sensor terminal B and PCM terminal 91.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0118 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.