DTC P0118 [LF, L3]

id0102008041a3

DTC P0118

ECT circuit high input

DETECTION CONDITION

• The PCM monitors the ECT sensor signal at PCM terminal 1M. If the PCM detects that the ECT sensor voltage is above 4.6 V, the PCM determines that ECT sensor circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• The PENDING CODE is available if the PCM detects the above malfunction condition.
• The FREEZE FRAME DATA is available.
• The 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 the ECT sensor or PCM connectors
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT ECT SENSOR FOR POOR CONNECTION
• Turn the ignition switch to the OFF position.
• Disconnect ECT sensor connector.
• Inspect for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Are any malfunctions?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
3
CLASSIFY ECT SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION
• Connect the WDS or equivalent to the DLC-2.
• Access the ECT PID.
• Connect a jumper wire between ECT sensor terminals A and B.
• Verify the ECT value
• Is the voltage below 4.5 V?
Yes
Replace the ECT sensor, then go to Step 8.
No
Go to the next step.
4
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between ECT sensor terminal A (harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a short to power, then go to Step 8.
No
Go to the next step.
5
INSPECT PCM FOR POOR CONNECTION
• Disconnect the PCM connector.
• Inspect for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
6
INSPECT ECT SENSOR SIGNAL CIRCUIT for an open circuit CIRCUIT
• Inspect for continuity between ECT sensor terminal A (harness-side) and PCM terminal 1M.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to Step 8.
7
INSPECT ECT SENSOR GROUND CIRCUIT for an open circuit CIRCUIT
• Inspect for continuity between ECT sensor terminal B (harness-side) and PCM terminal 2H.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for an open circuit, then go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0118 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from the PCM memory using the WDS or equivalent.
• Perform the KOEO/KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.