DTC P0118 [L3]

BME010200100W10

DTC P0118

ECT circuit high input

DETECTION CONDITION

• PCM monitors ECT sensor signal at PCM terminal 1M. If PCM detects ECT sensor voltage above 4.5 V, PCM determines that ECT sensor circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• ECT sensor malfunction
• Open circuit between ECT sensor terminal A and PCM terminal 1M
• Short to power circuit between ECT sensor terminal A and PCM terminal 1M
• Open circuit between ECT sensor terminal B and PCM terminal 2H
• Poor connection of ECT sensor or PCM connectors
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT POOR CONNECTION OF ECT SENSOR CONNECTOR
• Turn ignition key to OFF.
• Disconnect ECT sensor connector.
• Inspect for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 8.
No
Go to next step.
3
CLASSIFY ECT SENSOR MALFUNCTION OR HARNESS MALFUNCTION
• Connect WDS or equivalent to DLC-2.
• Access ECT PID.
• Connect a jumper wire between ECT sensor terminals A and B.
• Verify ECT value
• Is voltage below 4.5 V?
Yes
Replace ECT sensor, then go to Step 8.
No
Go to next step.
4
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between ECT sensor terminal A (harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace harness for short to power, then go to Step 8.
No
Go to next step.
5
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 8.
No
Go to next step.
6
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect continuity between ECT sensor terminal A (harness-side) and PCM terminal 1M.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, then go to Step 8.
7
INSPECT ECT SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
• Inspect continuity between ECT sensor terminal B (harness-side) and PCM terminal 2H.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, then go to next step.
8
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, then go to next step.
No
Go to next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.