DTC P0118


DTC P0118	ECT circuit high input
DETECTION CONDITION	• The PCM monitors the ECT sensor signal at PCM terminal 2J. If the PCM detects a that the ECT sensor voltage is more than 4.94 V, the PCM determines that the ECT sensor circuit has 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 2J • Short to power circuit between ECT sensor terminal A and PCM terminal 2J • Open circuit between ECT sensor terminal B and PCM terminal 2AX • Poor connection of the ECT sensor or PCM connectors • PCM malfunction


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2	INSPECT ECT SENSOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the ECT sensor connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
2		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 (wiring harness-side) A and B. • Verify the ECT value. • Is the voltage 4.94 V or less?	Yes	Replace the ECT sensor, then go to Step 8.
3		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 (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace the wiring harness for short to power, then go to Step 8.
4		No	Go to the next step.
5	INSPECT PCM FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
5		No	Go to the next step.
6	INSPECT ECT SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect continuity between ECT sensor terminal A (wiring harness-side) and PCM terminal 2J (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness for an open circuit, then go to Step 8.
7	INSPECT ECT SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect continuity between ECT sensor terminal B (wiring harness-side) and PCM terminal 2AX (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
7		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 the DTC from the PCM memory using WDS or equivalent. • Perform the KOEO/KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE.)
9		No	Troubleshooting completed.