Electronic Throttle Control System Test

Connect a tachometer to engine. Start and run engine until normal operating temperature is obtained. On vehicle without air conditioning, depress and release accelerator. An RPM higher than curb idle speed should be seen for specified time shown in EGR and Throttle Control Specifications table.
On vehicles equipped with air conditioning or rear window defogger, turning on the air conditioner or defogger and depressing accelerator for a moment should give an RPM higher than curb idle speed. Turning off the air conditioner or rear window defogger will result in normal idle speed.
NOTE: The air conditioning clutch will cycle on and off as it is running. DO NOT mistake this for electronic throttle control operation.
On all vehicles, if speed increases do not occur as outlined above, turn engine off and disconnect 3-wire connector at carburetor (idle stop solenoid and duty cycle solenoid). Using an ohmmeter, check the resistance of the solenoid by measuring from the 3-wire connector containing the Black wire to ground. Resistance should be 15-35 ohms. If not, replace idle stop solenoid.
On vehicles without air conditioning or rear window defogger, start vehicle and before specified time has elapsed, measure voltage at Black wire of 3-wire connector. Voltmeter reading should equal charging system voltage. If voltmeter reading does not equal charging system voltage, replace the Gray starter timer on 3.7L Federal models. On all other models, replace the computer.
On air conditioned vehicles, start engine and turn on air conditioner. Measure voltage at Black wire of 3-wire connector. Voltmeter reading should equal charging system voltage AFTER specified time has elapsed. If not, check wiring back to instrument panel for an open circuit.