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Section
Testing
Ignition Modules
Troubleshooting
Tips
Save yourself time! Always begin with a thorough
visual and “hands-on” inspection. You can often
find the cause of many problems by just looking.
Has the vehicle been serviced recently? Some-
times things get reconnected to the wrong place,
or not at all.
Poor grounding can cause no-starts! Some
modules make ground connections to vehicle
chassis. Check mounting hardware, module
flanges and chassis for clean contact surfaces and
snug attachment.
• Inspect wiring for:
– Contact with sharp edges.
– Contact with hot surfaces, such as exhaust
manifolds.
– Pinched, burned or chafed insulation.
– Proper routing and connections.
• Check electrical connectors for:
– Corrosion on pins.
– Bent or damaged pins.
– Contacts not properly seated in housing.
– Bad wire crimps to terminals.
• Check crankshaft/camshaft sensors connected
to ignition module. (Refer to page 2-46.)
• Many ignition modules require heat transfer
grease applied between module and mounting
surface. Modules can overheat and fail if
grease is missing or incorrectly applied.
6DLC24
5AAC28