K 2500 Suburban 4WD V8-454 7.4L VIN N TBI (1995)
Pick-Up Coil: Testing and Inspection
Testing The Pickup Coil
TOOL REQUIRED
J 39200 Digital Multimeter.
Make sure the ignition switch is "OFF."
INSPECTION
1. Remove the distributor cap.
2. Disconnect the pickup coil connector from the ignition control module (ICM).
3. Test the resistance of the coil with J 39200.
A. Connect J 39200 to either pickup coil lead and the housing as shown (1) in the image. The reading should be OL (infinite). If not, replace the
coil.
B. Connect J 39200 to both pickup coil leads, (2) in the image. Flex the leads by hand at the coil and the connector to locate any intermittent
opens. J 39200 should read a constant value in the 500 to 1500 ohm range. If not, replace the coil.
To replace the pickup coil, remove the distributor.
