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Test 25F - ATC Evaporator Temperature Sensor Circuit

WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform TEST 16A or 19A before proceeding with this test.
  1. Connect DRB. Read EVAPORATOR TEMPERATURE SENSOR. If display is EVAP TEMP: -70, go to next step. If display is not as specified, go to step 6).
  2. Unplug evaporator temperature sensor, located on A/C-heater unit. With DRB in voltmeter mode, probe Light Green/Black wire at evaporator sensor harness connector. If voltage is not higher than 10 volts, go to next step. If voltage is higher than 10 volts, repair short to voltage on Light Green/Black wire.
  3. Connect jumper wire between evaporator temperature sensor harness connector terminals. Read EVAPORATOR TEMPERATURE SENSOR. If display is EVAP TEMP: -70, go to next step. If display is not as specified, replace sensor. Perform VERIFICATION TEST.
  4. Disconnect jumper wire. Connect jumper wire between Light Green/Black wire and ground at harness connector. Read EVAPORATOR TEMPERATURE SENSOR. If display is EVAP TEMP: -70, go to next step. If display is not as specified, repair open Gray/Tan wire between sensor and BCM. Perform VERIFICATION TEST.
  5. Disconnect jumper wire. Connect jumper wire between Light Green/Black wire and ground at Gray BCM harness connector, leaving connector attached. Read EVAPORATOR TEMPERATURE SENSOR. If display is EVAP TEMP: -70, replace BCM. Perform VERIFICATION TEST. If display is not as specified, repair open Light Green/Black wire between sensor and BCM. Perform VERIFICATION TEST.
  6. Unplug evaporator temperature sensor, located on A/C-heater unit. Read EVAPORATOR TEMPERATURE SENSOR. If display is not EVAP TEMP: -70, go to next step. If display is not as specified, go to step 8).
  7. Turn ignition off. Unplug BCM. With DRB in ohmmeter mode, probe Light Green/Black wire at Gray BCM connector. If resistance is less than 5 ohms, repair short to ground on Light Green/Black wire between sensor and BCM. Perform VERIFICATION TEST. If resistance is not less than 5 ohms, replace BCM. Perform VERIFICATION TEST.
  8. Connect wiring to evaporator temperature sensor. Erase BCM codes. Wait 2 minutes. Retrieve BCM codes. If specified code does not return, go to next step. If EVAPORATOR SENSOR FAILURE code returns, replace sensor.
  9. Start engine. Turn A/C on for 5 minutes. Retrieve BCM codes. If specified code does not return, sensor circuit is okay at this time. If EVAPORATOR SENSOR FAILURE code returns, replace sensor. Perform VERIFICATION TEST.
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