Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Component Tests and General Diagnostics

Spark Test:





1. Disconnect ignition coil assembly from intake collector.
2. Connect a known good spark plug to the ignition coil assembly.
3. Place end of spark plug against a suitable ground, crank the engine and check for spark.
4. Repeat this process at each spark plug.
- If any cylinder does not show spark, proceed to IGNITION COIL TESTS. Testing and Inspection
- If Ignition Coil test is O.K., proceed to POWER TRANSISTOR TESTS. Ignition Control Module
- If all cylinders test O.K., inspect for fouled spark plugs and clean or replace as necessary.
5. If no faults are found in the above tests, proceed to Computers and Control Systems for further diagnosis.