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DTC P0116: ECT Sensor Circuit Range/Performance Problem (2005-2006 models) Acura RSX I facelift

Testing & Diagnostics 12 illustrations ~1763 words
  1. Turn the ignition switch ON (II).
  2. 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 7 . NO - Go to step 3.
  3. Note the value of the ECT SENSOR in the DATA LIST with the HDS.
  4. 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.
  5. 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 .
  6. Note the value of the ECT SENSOR in the DATA LIST with the HDS.
  7. Turn the ignition switch OFF.
  8. Open the engine hood, and let the engine cool for 3 hours.
  9. Turn the ignition switch ON (II).
  10. 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.
  11. Turn the ignition switch OFF.
  12. Replace the ECT sensor (see «CKP SENSOR REPLACEMENT»(ref-218785-S26595789332006021000000) ).
  13. Turn the ignition switch ON (II).
  14. Reset the ECM/PCM with the HDS.
  15. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-218787-S18900728242006021000000) ).
  16. 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»(ref-218785-S20313967292006021000000) . NO - Troubleshooting is complete.

Scheme 123

Scheme 123: DTC P0117: ECT Sensor Circuit Low Voltage (2002-2004 models)
Scheme 123: DTC P0117: ECT Sensor Circuit Low Voltage (2002-2004 models)
  1. Turn the ignition switch ON (II).
  2. Check the ECT with a scan tool or the HDS. Is 302°F (150°C) or higher, or 0 V 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.
  3. Disconnect the ECT sensor 2P connector.
  4. Check the ECT with a scan tool or the HDS. Is 302°F (150°C) or higher, or 0 V indicated? YES - Go to step 5. NO - Replace the ECT sensor (see «CKP SENSOR REPLACEMENT»(ref-218785-S26595789332006021000000) ).
  5. Turn the ignition switch OFF.
  6. Disconnect ECM/PCM connector B (24P).
  7. 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 ECM/PCM (B8) and the ECT sensor. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-218785-S00586955502006021000000) ).

Scheme 124

Scheme 124: DTC P0117: ECT Sensor Circuit Low Voltage (2005-2006 models)
Scheme 124: DTC P0117: ECT Sensor Circuit Low Voltage (2005-2006 models)
  1. Turn the ignition switch ON (II).
  2. 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.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Turn the ignition switch ON (II).
  6. 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 7 .
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HDS.
  9. Disconnect ECM/PCM connector B (24P).
  10. 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 .
  11. Turn the ignition switch OFF.
  12. Replace the ECT sensor (see «CKP SENSOR REPLACEMENT»(ref-218785-S26595789332006021000000) ).
  13. Reconnect all connectors.
  14. Turn the ignition switch ON (II).
  15. Reset the ECM/PCM with the HDS.
  16. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-218787-S18900728242006021000000) ).
  17. 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»(ref-218785-S20313967292006021000000) . NO - Troubleshooting is complete.
  18. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ).
  19. 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»(ref-218785-S20313967292006021000000) . 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-218785-S00586955502006021000000) ).

Scheme 125

Scheme 125: DTC P0118: ECT Sensor Circuit High Voltage (2002-2004 models)
Scheme 125: DTC P0118: ECT Sensor Circuit High Voltage (2002-2004 models)

Scheme 126

Scheme 126
Scheme 126

Scheme 127

Scheme 127
Scheme 127

Scheme 128

Scheme 128
Scheme 128

Scheme 129

Scheme 129
Scheme 129
  1. Turn the ignition switch ON (II).
  2. Check the ECT with a scan tool or the HDS. Is -4°F ( -20°C) or less, or 5 V 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.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the ECT with a scan tool or the HDS. Is -4°F ( -20°C) or less, or 5 V indicated? YES - Go to step 8. NO - Replace the ECT sensor (see «CKP SENSOR REPLACEMENT»(ref-218785-S26595789332006021000000) ).
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Turn the ignition switch ON (II).
  11. 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 14 .
  12. Connect ECT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  13. Check for continuity between ECM/PCM connector terminal A10 and body ground. Is there continuity? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-218785-S00586955502006021000000) ). NO - Repair open in the wire between the ECM/PCM (A10) and the ECT sensor.
  14. 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. NO - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ), then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(ref-218785-S00586955502006021000000) ).

Scheme 130

Scheme 130: DTC P0118: ECT Sensor Circuit High Voltage (2005-2006 models)
Scheme 130: DTC P0118: ECT Sensor Circuit High Voltage (2005-2006 models)

Scheme 131

Scheme 131
Scheme 131

Scheme 132

Scheme 132
Scheme 132

Scheme 133

Scheme 133
Scheme 133

Scheme 134

Scheme 134
Scheme 134
  1. Turn the ignition switch ON (II).
  2. Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40°F ( -40°C) or less, or 4.90 V or more 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.
  3. Turn the ignition switch OFF.
  4. Disconnect the ECT sensor 2P connector.
  5. Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire.
  6. Turn the ignition switch ON (II).
  7. Check the ECT SENSOR in the DATA LIST with the HDS. Is about -40°F ( -40°C) or less, or 4.90 V or more indicated? YES - Go to step 8. NO - Go to step 18 .
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire from the ECT sensor 2P connector.
  10. Turn the ignition switch ON (II).
  11. 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 .
  12. Turn the ignition switch OFF.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector A (31P).
  15. Connect ECT sensor 2P connector terminal No. 2 to body ground with a jumper wire.
  16. 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 .
  17. 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 .
  18. Turn the ignition switch OFF.
  19. Replace the ECT sensor (see «CKP SENSOR REPLACEMENT»(ref-218785-S26595789332006021000000) ).
  20. Reconnect all connectors.
  21. Turn the ignition switch ON (II).
  22. Reset the ECM/PCM with the HDS.
  23. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(ref-218787-S18900728242006021000000) ).
  24. 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»(ref-218785-S20313967292006021000000) . NO - Troubleshooting is complete.
  25. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see «HOW TO UPDATE THE ECM/PCM»(ref-218783-S21903648732006021000000) ).
  26. 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»(ref-218785-S20313967292006021000000) . 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-218785-S00586955502006021000000) ).

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