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DTC P1705: ECT Sensor Signal Input Malfunction: Testing

  1. Check for engine performance related DTC. See SCAN TOOL METHOD (PCM)  under RETRIEVING TROUBLE CODES. If DTC P0117 or P0118 is present, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Repair as necessary. If DTC P0117 or P0118 is not present, go to next step.
  2. Ensure engine is cold. Start engine. Using a DVOM, check duty cycle (voltage on-time) between ground and TCM harness connector E25, terminal No. 10 (Gray/Black wire). If reading is 3.4-4.6 volts with coolant temperature at 32-122°F (0-50°C), or 6.7-9.3 volts with coolant temperature greater than 122°F (50°C), check for an intermittent problem or faulty TCM. See DIAGNOSTIC AIDS . If reading is not as specified, go to next step.
  3. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. Using a DVOM, measure voltage between ground and PCM harness connector C21, terminal No. 5 (Gray/Green wire). See Figure. If reading is 9-14 volts, substitute PCM with a known-good unit. If reading is not as specified, go to next step.
  4. Check Gray/Black wire for an open or short to ground. Check TCM harness connector E25, terminal No. 10 (Gray/Black wire) for a poor connection. Repair as necessary. If wire is okay, substitute TCM with a known-good unit. Retest system.
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