Warm Dr4 - Throttle Position Sensor

Connect voltmeter negative lead to a good ground, and attach its positive lead to cavity No. 13 of 13-way ECU connector. Turn ignition switch to "RUN" position. Check voltage with throttle closed and open. On vehicles with ECU No. MD072035, voltmeter should indicate 0-1 volt with throttle closed and 2-3 volts with throttle opened. On vehicles with ECUs No. MD080152, MD082058 or MD082059, voltage should be 0-1 volt with throttle closed, 3-5.5 volts with throttle wide open.

Fig 1: View of ECU Connector, WARM DR4 - Throttle Position Sensor
Courtesy of CHRYSLER MOTORS.
If voltage is to specifications, proceed to next test. If voltage is not correct, turn ignition switch off. Disconnect 4-way carburetor connector. Connect ohmmeter leads to Orange and Light Green/Red wires of carburetor connector. Measure resistance with throttle closed and wide open. With throttle closed, reading should be 3500-6500 ohms. With throttle wide open, reading should be 100-1000 ohms.

Fig 2: View of Carb. Connector, WARM DR4 - Throttle Position Sensor
Courtesy of CHRYSLER MOTORS.
If resistance is incorrect, replace throttle position sensor. If reading is okay, check that ignition switch is still off. Reconnect carburetor 4-way connector. Disconnect 13-way connector from ECU. Connect ohmmeter leads to cavities No. 3 and 13.

Fig 3: View of 13-Way Connector, WARM DR4 - Throttle Position Sensor
Courtesy of CHRYSLER MOTORS.
Resistance should be the same as shown in step 2). If resistance is okay, replace ECU. If no resistance, repair open wires from throttle sensor to ECU.