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DTC P0118

id010200804100

DTC P0118 | ECT circuit high input
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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

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is same DTC present? | Yes | Go to the next step.
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.
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.
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.
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.
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.
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.
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.)
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.)
No | Troubleshooting completed.