| DTC P0118 | Engine coolant temperature (ECT) sensor circuit high input |
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DETECTION CONDITION
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• The PCM monitors the ECT sensor signal. If the voltage at PCM terminal 230 remains high, the PCM determines that there is an ECT sensor circuit problem.
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POSSIBLE CAUSE
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• ECT sensor malfunction
• Connector or terminal malfunction
• Open circuit in the wiring harness between ECT sensor terminal B and PCM terminal 230
• Short to power supply in the wiring harness between ECT sensor terminal B and PCM terminal 230
• Open circuit in the wiring harness between ECT sensor terminal A and PCM terminal 244
• PCM malfunction
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Diagnostic procedure
| STEP | INSPECTION | ACTION | |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the M-MDS to the DLC-2.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
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4
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CLASSIFY MALFUNCTION AS OR OTHER SHORT TO POWER SUPPLY MALFUNCTION
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between ECT sensor terminal B (wiring harness-side) and body ground.
• Is the voltage more than 5.0 V?
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Yes
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Go to the next step.
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No
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Go to Step 7.
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5
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INSPECT ECT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the engine switch off.
• Disconnect the PCM connector.
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between PCM terminal 230 (wiring harness-side) and body ground.
• Is the voltage more than 5.0 V?
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Yes
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Repair or replace the wiring harness between ECT sensor terminal B (wiring harness-side) and PCM terminal 230 (wiring harness-side), then go to Step17.
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No
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Go to the next step.
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6
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 17.
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No
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Go to Step 17.
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7
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CLASSIFY MALFUNCTION AS ECT SENSOR OR OTHER MALFUNCTION
• Connect the M-MDS to DLC-II.
• Access the ECT PID.
• Turn the engine switch to ON position.
• Using a jumper wire, verify that the change in the quantity of the ECT value while shorting ECT connector terminals A and B.
• Does the engine coolant temperature value charge from –40 °C {–40 °F} to 130 °C {266 °F}?
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Yes
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Go to the next step.
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No
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Go to Step 11.
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8
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INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the ECT sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 17.
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No
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Go to the next step.
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9
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INSPECT ECT SENSOR
• Inspect the ECT sensor.
• Is there any malfunction?
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Yes
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Replace the ECT sensor, then go to Step 17.
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No
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Go to the next step.
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10
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INSPECT ECT SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the ECT sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 17.
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No
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Go to Step 17.
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11
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CLASSIFY MALFUNCTION AS ECT SENSOR SIGNAL CIRCUIT OR ECT SENSOR GROUND CIRCUIT MALFUNCTION
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between ECT sensor terminal B (wiring harness-side) and body ground.
• Is the voltage approx. 5.0 V?
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Yes
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Go to Step 14.
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No
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Go to the next step.
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12
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INSPECT ECT SENSOR SIGNAL CIRCUIT FOR OPEN
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between PCM terminal 230 (wiring harness-side) and body ground.
• Is the voltage approx. 5.0 V?
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Yes
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Repair or replace the wiring harness between ECT sensor terminal B (wiring harness-side) and PCM terminal 230 (wiring harness-side), then go to Step17.
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No
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Go to the next step.
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13
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 17.
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No
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Go to Step 17.
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14
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CLASSIFY MALFUNCTION AS ECT SENSOR GROUND CIRCUIT OR OTHER MALFUNCTION
• Turn the engine switch off.
• Inspect for continuity between the ECT sensor terminal A (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Go to Step 17.
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No
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Go to the next step.
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15
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CLASSIFY MALFUNCTION AS ECT SENSOR GROUND CIRCUIT OR OTHER MALFUNCTION
• Turn the engine switch off.
• Inspect for continuity between the PCM terminal 244 (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness between ECT sensor terminal A (wiring harness-side) and PCM terminal 244 (wiring harness-side), then go to Step17.
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No
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Go to the next step.
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16
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to the next step.
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No
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Go to the next step.
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17
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VERIFY THAT DTC P0118 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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18
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VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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