Cold Dr4 - Air Intake Temperature Sensor
- Connect voltmeter negative lead to ground. Connect voltmeter positive lead to cavity No. 4 of 13-wire ECU connector. Turn ignition switch to "RUN" position. On vehicles with ECU No. MD072035, voltmeter should read 3-5.5 volts with engine cold; 1-2 volts at room temperature and 0-1 volt with engine warm. On vehicles with ECU MD080152, MD082058 or MD082059, voltmeter should read 2-3 volts with engine cold; 1-2 volts at room temperature and 0-1 with engine warm.
- If voltage is okay, proceed to COLD DR5. If not okay, connect an ohmmeter between terminals of sensor connector. Ohmmeter should read 6000 or more ohms with engine cold, 1300-2500 ohms at room temperature, and 100-1300 ohms with engine warm. If resistance is as specified, proceed to step 3). If resistance is not to specification, replace air intake temperature sensor.
- Reconnect air temperature sensor connector. Disconnect 13 wire ECU connector. Connect ohmmeter leads to cavity Nos. No. 2 and 4. Ohmmeter should read as in step 2). If resistance is correct, replace ECU. If resistance is incorrect, repair open or shorted wires from air intake temperature sensor to ECU.
Courtesy of CHRYSLER MOTORS.