Home ReviewsRefund
Home/Honda/Pilot/Honda Pilot I (2002-2005)/Repair manual/Testing & Diagnostics/DTC P0117: ECT Sensor Circuit Low Voltage
Contents Wiring diagrams Section: Testing & Diagnostics All sections

DTC P0117: ECT Sensor Circuit Low Voltage Honda Pilot I

Testing & Diagnostics 11 illustrations ~1002 words
  1. Turn the ignition switch ON (II).
  2. Check the ECT with the scan tool or the HDS. Is 302°F (150°C) or higher (or H-Limit in the HDS), 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 at the PCM.
  3. Disconnect the ECT sensor 2P connector.
  4. Check the ECT with the scan tool or the HDS. Is 302°F (150°C) or higher (or H-Limit in the HDS), or 0 V indicated? YES -Go to step 5. NO -Replace the ECT sensor.
  5. Turn the ignition switch OFF.
  6. Disconnect PCM connector C (31P).
  7. Check for continuity between ECT sensor 2P connector terminal No. 2 and body ground.

Is there continuity?

  1. YES -Repair short in the wire between the PCM (C26) and the ECT sensor.
  2. NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If normal voltage is indicated, replace the original PCM.

Scheme 83

Scheme 83: DTC P0118: ECT Sensor Circuit High Voltage
Scheme 83: DTC P0118: ECT Sensor Circuit High Voltage

Scheme 84

Scheme 84
Scheme 84
  1. Turn the ignition switch ON (II).
  2. Check the ECT with the scan tool or the HDS. Is -4°F (-20°C) or less (or L-Limit in the HDS), 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 at the 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 the scan tool or the HDS. Is -4°F (-20°C) or less (or L-Limit in the HDS), or 5 V indicated? YES -Go to step 8. NO -Replace the ECT sensor.
  8. Turn the ignition switch OFF.
  9. Remove the jumper wire.
  10. Connect PCM connector terminals C18 and C26 with a jumper wire.
  11. Turn the ignition switch ON (II).
  12. Check the ECT with the scan tool or the HDS. Is -4°F (-20°C) or less (or L-Limit in the HDS), or 5 V indicated? YES -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If normal voltage is indicated, replace the original PCM. NO -Repair open in the wire between the PCM (C18, C26) and the ECT sensor.

Scheme 85

Scheme 85: DTC P0122: TP Sensor Circuit Low Voltage
Scheme 85: DTC P0122: TP Sensor Circuit Low Voltage

Scheme 86

Scheme 86
Scheme 86

Scheme 87

Scheme 87
Scheme 87

Scheme 88

Scheme 88
Scheme 88

Scheme 89

Scheme 89
Scheme 89

Scheme 90

Scheme 90
Scheme 90

Scheme 91

Scheme 91
Scheme 91
  1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then turn the ignition switch OFF.
  2. Turn the ignition switch ON (II).
  3. Check the throttle position with the scan tool or the HDS. Is there about 10% or 0.5 V when the throttle is fully closed and about 90% or 4.5 V when the throttle is fully opened? YES -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the TP sensor and at the PCM. NO -Go to step 4.
  4. Turn the ignition switch OFF.
  5. Disconnect the TP sensor 3P connector.
  6. Turn the ignition switch ON (II).
  7. Measure voltage between TP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES Go to step 8. NO Go to step 15 .
  8. Turn the ignition switch OFF.
  9. At the sensor side, measure resistance between TP sensor 3P connector terminals No. 1 and No. 2 with the throttle fully closed. Is there about 0.5-0.9 kohm? YES -Go to step 10. NO -Replace the throttle body.
  10. Measure resistance between TP sensor 3P connector terminals No. 2 and No. 3 with the throttle fully closed. Is there about 4.5 kohm? YES -Go to step 11. NO -Replace the throttle body.
  11. Disconnect PCM connector C (31P).
  12. At the wire harness side, check for continuity between TP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (C27) and the TP sensor. NO -Go to step 13.
  13. Connect PCM connector terminal C27 to body ground with a jumper wire.
  14. At the wire harness side, check for continuity between TP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If prescribed voltage is now available, replace the original PCM. NO -Repair open in the wire between the PCM (C27) and the TP sensor.
  15. Measure voltage between PCM connector terminals C18 and C28. Is there about 5 V? YES -Repair open in the wire between the PCM (C28) and the TP sensor. NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If voltage is normal, replace the original PCM.

Scheme 92

Scheme 92: DTC P0123: TP Sensor Circuit High Voltage
Scheme 92: DTC P0123: TP Sensor Circuit High Voltage

Scheme 93

Scheme 93
Scheme 93
  1. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then turn the ignition switch OFF.
  2. Turn the ignition switch ON (II).
  3. Check the throttle position with the scan tool or the HDS. Is there about 10% or 0.5 V when the throttle is fully closed and about 90% or 4.5 V when the throttle is fully opened? YES -Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the TP sensor and at the PCM. NO -Go to step 4.
  4. Turn the ignition switch OFF.
  5. Disconnect the TP sensor 3P connector.
  6. Turn the ignition switch ON (II).
  7. At the wire harness side, measure voltage between TP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Replace the throttle body. NO -Go to step 8.
  8. Measure voltage between PCM connector terminals C18 and C28. Is there about 5 V? YES -Repair open in the wire between the PCM (C18) and the TP sensor. NO -Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING»(ref-173995-S22023424662005041500000) ). If voltage is normal, replace the original PCM.

More articles — Pgm-Fi System