Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chrysler >> 2000 >> Voyager Base, 2.4 B >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> System Tests >> Overhead Console >> Incorrect Ambient Temperature Readings (Generally Plus Or Minus 5 Degrees)

Incorrect Ambient Temperature Readings (Generally Plus Or Minus 5 Degrees)

  1. Turn ignition off. Remove ambient temperature sensor. Sensor has a 2-pin connector with a Black/Light Blue wire and a Violet/Light Green wire and is located behind right center of front bumper. Measure resistance between ambient temperature sensor terminals and compare results with AMBIENT TEMPERATURE SENSOR RESISTANCE  table. If resistance is not as specified, replace ambient temperature sensor. If resistance is as specified, go to next step.
    AMBIENT TEMPERATURE SENSOR RESISTANCE

    Ambient Temperature °F (°C) Ohms
    32 (0) 29,300-36,000
    50 (10) 18,000-22,000
    68 (20) 11,400-13,600
    77 (25) 9100-10,800
    86 (30) 7400-8700
    104 (40) 4900-5700
    122 (50) 3300-3800
  2. Close all vehicle doors and ensure all lights are off. Measure resistance between ground and Black/Light Blue wire at ambient temperature sensor connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, go to step  7 .
  3. Connect ambient temperature sensor. Disconnect Compass/Mini-Trip Computer (CMTC). CMTC is located behind overhead console. Measure resistance between terminals No. 2 (Black/Light Blue wire) and No. 5 (Violet/Light Green wire) at CMTC connector. Compare ohmmeter reading with AMBIENT TEMPERATURE SENSOR SPECIFICATIONS  table. If resistance is as specified, replace CMTC. If resistance is not as specified, go to next step.
  4. Disconnect ambient temperature sensor. Measure resistance between ground and Black/Light Blue wire at ambient temperature sensor connector. If resistance is less than 500 k/ohms, repair partial short to ground in Black/Light Blue wire between ambient temperature sensor and CMTC. If resistance is 500 k/ohms or more, go to next step.
  5. Measure resistance between ground and Violet/Light Green wire at ambient temperature sensor connector. If resistance is less than 500 k/ohms, repair partial short to ground in Violet/Light Green wire between ambient temperature sensor and CMTC. If resistance is 500 k/ohms or more, go to next step.
  6. Measure resistance between ambient temperature sensor connector terminals. If resistance is less than 500 k/ohms, Violet/Light Green wire and Black/Light Blue wire are shorted together between ambient temperature sensor and CMTC. Repair wiring as necessary. If resistance is 500 k/ohms or more, system is functioning properly at this time. Fault may be intermittent.
  7. Disconnect Compass/Mini-Trip Computer (CMTC). CMTC is located behind overhead console. Connect a jumper wire between ground and Black/Light Blue wire at ambient temperature sensor connector. Measure resistance between ground and terminal No. 2 (Black/Light Blue wire) at CMTC connector. If resistance is less than 5 ohms, replace CMTC. If resistance is 5 ohms or more, repair open in Black/Light Blue wire between CMTC and ambient temperature sensor.
scientia non olet · About Mike's Workshop Manuals