- Turn the ignition switch ON (II).
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about 176 °F (80 °C) or higher, or 0.78 V or less indicated? YES - Go to step 6 . NO - Go to step 3.
- Note the value of the ECT SENSOR in the DATA LIST with the HDS.
- Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
- Check the ECT SENSOR in the DATA LIST with the HDS. Does the ECT SENSOR change 18 °F (10 °C) or higher? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM. NO - Go to step 11 .
- Note the value of the ECT SENSOR in the DATA LIST with the HDS.
- Turn the ignition switch OFF.
- Open the hood, and let the engine cool for 3 hours.
- Turn the ignition switch ON (II).
- Check the ECT SENSOR in the DATA LIST with the HDS. Does the ECT SENSOR change 18 °F (10 °C) or more? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM. NO - Go to step 11.
- Turn the ignition switch OFF.
- Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(ref-219371-S15629695632006021400000) ).
- Turn the ignition switch ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-219374-S42320443812006021400000) ).
- Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0116 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
Scheme 30
- Turn the ignition switch ON (II).
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about 356 °F (180 °C) or higher, or 0.08 V or less indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
- Turn the ignition switch OFF.
- Disconnect the ECT sensor 2P connector.
- Turn the ignition switch ON (II).
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about 356 °F (180 °C) or higher, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
- Turn the ignition switch OFF.
- Jump the SCS line with the HDS.
- Disconnect ECM/PCM connector B (24P).
- Check for continuity between ECT sensor 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the ECT sensor and the ECM/PCM (B8), then go to step 13 . NO - Go to step 18 .
- Turn the ignition switch OFF.
- Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(ref-219371-S15629695632006021400000) ).
- Reconnect all connectors.
- Turn the ignition switch ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-219374-S42320443812006021400000) ).
- Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
- Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING»(ref-219370-S15199960282006021400000) ).
- Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-219371-S37179676622006021400000) ).
Scheme 31
Scheme 32
Scheme 33
Scheme 34
Scheme 35
- Turn the ignition switch ON (II).
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40 °F ( -40 °C) or less, or 4.90 V or higher indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
- Turn the ignition switch OFF.
- Disconnect the ECT sensor 2P connector.
- Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
- Turn the ignition switch ON (II).
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40 °F ( -40 °C) or less, or 4.90 V or higher indicated? YES - Go to step 8. NO - Go to step 18 .
- Turn the ignition switch OFF.
- Remove the jumper wire.
- Turn the ignition switch ON (II).
- Measure voltage between ECT sensor 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12. NO - Go to step 17 .
- Turn the ignition switch OFF.
- Jump the SCS line with the HDS.
- Disconnect ECM/PCM connector A (31P).
- Connect ECT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
- Check for continuity between ECM/PCM connector terminal A23 and body ground. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the ECM/PCM (A23) and the ECT sensor, then go to step 20 .
- Measure voltage between ECM/PCM connector terminal B8 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (B8) and the ECT sensor, then go to step 20 . NO - Go to step 25 .
- Turn the ignition switch OFF.
- Replace the ECT sensor (see «ECT SENSOR REPLACEMENT»(ref-219371-S15629695632006021400000) ).
- Reconnect all connectors.
- Turn the ignition switch ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-219374-S42320443812006021400000) ).
- Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.
- Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING»(ref-219370-S15199960282006021400000) ).
- Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0118 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-219371-S37179676622006021400000) ).