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, FUEL SYSTEM.

^ Verify engine is functioning properly ie. 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 - This will indicate proper testing sequence. If after performing the procedures the problem still persists, refer to COMPONENT TESTING for further testing. The following is a description of the testing procedures.



TEST DESCRIPTION




TEST 1 - CHECK FIRING ORDER
TEST 2 - SPARK TEST AT PLUGS
TEST 3 - SECONDARY DISPLAYS
TEST 4 - SPARK AT COIL
TEST 5 - DISTRIBUTOR ASSEMBLY
TEST 6 - SPARK PLUG WIRE RESISTANCE
TEST 7 - PRIMARY CIRCUIT
STEP 1- Coil voltage check, ignition switch in ON position.
STEP 2- Coil voltage check, ignition switch in START position.
STEP 3- Starter solenoid and wiring check
STEP 4- Coil voltage drop
STEP 5- Wiring continuity check
STEP 6- Resistor wire resistance check
STEP 7- Ignition switch resistance check
TEST 8 - IGNITION COIL
STEP 1- Coil visual check
STEP 2- Coil primary resistance check
STEP 3- Coil secondary resistance check
TEST 9 - SPARK PLUG CHECK
TEST 10 - SENSOR AND IGNITION CONTROL MODULE CHECK
STEP 1- Module check
STEP 2- Pickup coil resistance check
STEP 3- Pickup resistance check
STEP 4- Pickup coil continuity check
STEP 5- Module ground check
STEP 6- Pickup output check
TEST 11 - IGNITION CONTROL MODULE POWER AND GROUND CHECK
STEP 1- Voltage check
STEP 2- Voltage repair
STEP 3- Current draw check