DTC P0118 [AJ (3.0L Duratec)]

id0102a4804100

DTC P0118

ECT circuit high input

DETECTION CONDITION

• PCM monitors input voltage from ECT sensor when engine is running. If input voltage at PCM terminal 38 is above 4.6 V, PCM determines that ECT circuit has a malfunction.

POSSIBLE CAUSE

• ECT sensor malfunction
• Connector or terminal malfunction
• Short to power supply in wiring between ECT sensor terminal 1 and PCM terminal 38
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to next step.
No
Record FREEZE FRAME DATA on repair order, then go to next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect the ECT sensor connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminals, then go to Step 7.
No
Go to next step.
4
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair terminal, then go to Step 7.
No
Go to next step.
5
INSPECT ECT SIGNAL CIRCUIT FOR SHORT TO POWER CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Measure voltage between ECT sensor terminal 1 (harness-side) and body ground.
• Is there voltage 0 V?
Yes
Go to next step.
No
Repair or replace suspected harness, then go to Step 7.
6
INSPECT ECT SENSOR
• Inspect the ECT sensor.
• Is there any malfunction?
Yes
Replace ECT sensor, then go to next step.
No
Go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0118 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from memory using WDS or equivalent.
• Start engine.
• Perform "KOEO/KOER self-test"
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
8
VERIFY AFTER SERVICE PRECAUTION
• Perform "AFTER SERVICE PRECAUTION".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.