DTC P0118 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200100W02

DTC P0118

ECT circuit high input

DETECTION CONDITION

• The PCM monitors ECT sensor signal at PCM terminal 41. If the PCM detected ECT sensor voltage above 4.58 V, the PCM determines that the ECT sensor circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (Engine cooling system).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the 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 41
• Short to power circuit between ECT sensor terminal A and PCM terminal 41
• Open circuit between ECT sensor terminal B and PCM terminal 20
• Poor connection of ECT sensor or PCM connectors
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Engine cooling system related) been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the 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
VERIFY CURRENT INPUT SIGNAL STATUS- IS CONCERN INTERMITTENT OR CONSTANT
• Connect WDS or equivalent to DLC-2.
• Turn the ignition switch to ON (engine OFF).
• Access ECT PID.
• Is ECT PID above 4.57 V?
Yes
Go to next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERNS TROUBLESHOOTING procedure.
4
INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect ECT sensor connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Are there any malfunctions?
Yes
Repair or replace terminal, then go to Step 10.
No
Go to next step.
5
CLASSIFY ECT SENSOR OR HARNESS MALFUNCTION
• Connect jumper wire between ECT sensor terminals A and B (harness-side)
• Access ECT PID.
• Is ECT PID approx. 0 V?
Yes
Replace ECT sensor, then go to Step 10.
No
Go to next step.
6
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to ON (Engine OFF).
• Measure voltage between ECT sensor terminal A (harness-side) and body ground.
• Is there voltage B+?
Yes
Repair or replace harness for short to power, then go to Step 10.
No
Go to next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Disconnect PCM connector.
• Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
• Are there any malfunction?
Yes
Repair or replace terminal, then go to Step 10.
No
Go to next step.
8
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Disconnect PCM connector.
• Check continuity between ECT sensor terminal A (harness-side) and PCM terminal 41.
• Is there any continuity?
Yes
Go to next step.
No
Repair or replace harness for open, then go to Step 10.
9
INSPECT ECT SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
• Check continuity between ECT sensor terminal B (harness-side) and PCM terminal 20.
• Is there any continuity?
Yes
Go to next step.
No
Repair or replace harness for open, then go to next step.
10
VERIFY TROUBLESHOOTING OF DTC P0118 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Turn the ignition switch to ON (Engine OFF).
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.