Flow of Diagnosis

Flow Of Diagnosis:

1. Verify customer complaint. It is important that you get an accurate description of the problem. What condition is the engine under when the problem occurs? Verify the complaint by road testing. For further description use DRIVEABILITY WORKSHEET and VEHICLE REPAIR HISTORY forms. Refer to INFO TYPE/TECHNICAL/MANAGEMENT SUPPORT.
2. A comprehensive visual inspection should be made to find possible causes of ignition system failure.
a. Check all fuses and grounds.
b. Check for correct mating of all connectors.
c. Check all connectors for corrosion or damage.
d. Check component wiring for damage.
3. Check TSB's for any aids in diagnosis, testing, warranty and recall information.
4. Before starting TESTING PROCEDURES/TEST 1 check the following.

^ Verify proper fuel delivery, refer to FUEL SYSTEMS.

^ Verify engine is functioning properly i.e.. compression test, rotor rotation and timing belt or chain routing.

^ Move all primary wires, connectors and battery cables by pushing, pulling and twisting by hand. If any bad connectors or corroded connections are found, make necessary repairs to wire or connector.

^ Disconnect secondary wire from ignition coil. Inspect the coil, distributor cap, rotor and ignition wires for cracks or carbon tracking. Replace components as needed. Refer to MAINTENANCE PROCEDURES and check vehicle's maintenance schedule to ensure spark plugs and wires have been properly maintained.

^ START TESTING with TEST 1 - CHECKING FIRING ORDER this will indicate proper testing sequence. If after performing the procedures the problem still persists, refer to COMPUTERIZED ENGINE CONTROLS/DIAGNOSIS AND TESTING for further testing. The following is a description of the testing procedures.






TEST DESCRIPTION



TEST 1 - CHECKING FIRING ORDER
TEST 2 - SPARK TEST AT PLUGS
TEST 3 - SECONDARY DISPLAYS
TEST 4 - SPARK FROM COIL
TEST 5 - DISTRIBUTOR ASSEMBLY
TEST 6 - SPARK PLUG WIRE RESISTANCE
TEST 7 - SPARK PLUG CHECK
TEST 8 - IGNITION COIL RESISTANCE
TEST 9 - AUTO SHUTDOWN RELAY