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Evaporator Temperature Sensor Circuit Open (Active)

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. See Figure. Turn the ignition on. Measure the voltage between the Evaporator Temperature Sensor Signal circuit and ground. If there is any voltage present, repair the Evaporator Temperature Sensor Signal circuit for a short to voltage. If there is no voltage present, go to the next step.
  2. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. See Figure. Measure the resistance between the Evaporator Temperature Sensor Signal circuit and the Sensor Ground circuit. The approximate circuit resistance should be:
    • 5900 ohms @ 100°F (38°C).
    • 6600 ohms @ 95°F (35°C).
    • 7400 ohms @ 90°F (32°C).
    • 8300 ohms @ 85°F (29°C).
    • 9400 ohms @ 80°F (27°C).
    • 10,600 ohms @ 75°F (24°C).
    • 11,900 ohms @ 70°F (21°C).
    • 13,500 ohms @ 65°F (18°C).
    • 15,300 ohms @ 60°F (16°C).
    • 17,500 ohms @ 55°F (13°C).
    • 19,900 ohms @ 50°F (10°C).
    • 22,800 ohms @ 45°F (7°C).
    • 26,100 ohms @ 40°F (4°C).
    • 30,000 ohms @ 35°F (2°C).
    • 34,600 ohms @ 30°F (-1°C).
    If the resistance is within the specifications, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION. If the resistance is not within the specifications, go to the next step.
  3. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. See Figure. Open the glove box door. Disconnect the glove box door roller latch from each side of the glove box. Roll the glove box downward toward the floor. Disconnect the in-line C202 harness connector. Measure the resistance of the Evaporator Temperature Sensor Signal circuit between the A/C-Heater Control Module C1 harness connector and the in-line C202 harness connector. See Fig 1 and Fig 2 . If the resistance is less than 5 ohms, go to the next step. If the resistance is more than 5 ohms, repair the Evaporator Temperature Sensor Signal circuit between the A/C-Heater Control Module C1 harness connector and the in-line C202 harness connector (HVAC side) for an open.
  4. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. See Figure. Open the glove box door. Disconnect the glove box door roller latch from each side of the glove box. Roll the glove box downward toward the floor. Disconnect the in-line C202 harness connector. Measure the resistance of the Sensor Ground circuit between the A/C-Heater Control Module C1 harness connector and the in-line C202 harness connector. See Fig 1 and Fig 2 . If the resistance is less than 5 ohms, check the wiring harness between the in-line C202 harness connector (plenum side) and the Evaporator Temperature Sensor for an open. If OK, replace the Evaporator Temperature Sensor. See EVAPORATOR TEMPERATURE SENSOR under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS article in HVAC. If the resistance is more than 5 ohms, repair the sensor ground circuit between the A/C-Heater Control Module C1 harness connector and the in-line C202 harness connector (HVAC side) for an open.
Fig 1: Locating In-Line Harness Connector C202
G00011428Courtesy of CHRYSLER CORP.
Fig 2: Identifying Terminals Of C202 Connector
G00172185Courtesy of DAIMLERCHRYSLER CORP.
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