IGNITION CONTROL SYSTEM — Trouble-shooting
EF & EC-656flowchartTrouble-shooting
Ignition Control System Trouble-shooting
1
Engine turns erratically.
2
Check ignition timing.
N.G.
Adjust.
Adjust.
Check for burned or fouled spark plug.
O.K.
3
Attach adapter *1 to high tension wire and position tip of adapter approx. 6 mm (0.24 in) away from cylinder block. With adapter held in that position, crank engine to see if spark jumps across gaps between tip and cylinder block at regular intervals.
O.K.
Check for burned or fouled spark plug.
N.G.
4
Check high-tension wires. Refer to MA section.
O.K.
5
Check air gap between reluctor and stator.
O.K.
6
Check IC ignition system. IC Ignition System is checked using a volt-ohmmeter. Follow the steps in the sequence indicated; if a fault is in found, correct the problem before continuing. If all tests indicate "O.K." replace the IC Ignition Unit. DO NOT REPLACE THE UNIT UNTIL ALL TESTS HAVE BEEN COMPLETED AND INDICATE "O.K.".
Go to test table.
WARNING
When current is flowing, never touch with bare hand high tension wires or any other parts with high voltage. If parts are moist, touching them could cause an electric shock, even if they are insulated. Always wear dry, well-insulated gloves or wrap affected parts with dry cloth before handling.
NOTE
*1: Preparation of spark plug for checking — Many things can be utilized as an adapter. However, it is recommended that a used spark plug whose threaded portion has been half cut off as shown in the figure be utilized.
1. When performing the following tests, use a multitester which can measure accurately in the following ranges; 0 to 20V. D.C.; 0 to 1,000Ω; 0 to 10V A.C.; 0 to 50,000Ω.
2. If possible, start the vehicles and let it run for 5 to 15 minutes with the hood closed. This will bring all components to normal operating temperature, and will make it easier to diagnose intermittent problems.
3. It is not necessary to disconnect the harness connectors when performing the tests which follow. Simply insert the meter probes into the back of appropriate connector cavity.