C 2500 3/4 Ton Pickup 2WD V8-379 6.2L DSL VIN J FI (1984)
Glow Plug Controller: Service and Repair
1982---84
1.
Disconnect electrical connector from thermal controller.
2.
Measure resistance between controller terminals using high impedance, digital ohmmeter set on 200 ohms scale.
3.
Resistance should be as follows:
Pins 2 to 3................................................................................................................................................................................................0.40---0.75 ohms
Pins 4 to 5......................................................................................................................................................................................................24---30 ohms
Pins 1 to 5..................................................................................................................................................................................................117---143 ohms
Pins 2 to 6............................................................................................................................................................................................Continuity (0) ohms
4.
If resistance values are not as specified, controller is defective.
5.
If resistance values are within specifications, reconnect electrical connector and observe controller operation with ignition key in on position and
engine stopped.
6.
If controller cycles more than one time, controller is satisfactory.
7.
If controller cycles only once, check for a short or open in harness as outlined in ``System Diagnosis.''
8.
If all other components are satisfactory, but controller cycles only once in step 5, replace controller and recheck system operation.
