Mirage L4-1597cc 1.6L DOHC (1990)
Ignition Coil Secondary Circuit Test
4. Using an ohm meter, check the resistance between secondary terminals for cylinders No. 1 and No. 4.
Resistance
10.3 - 13.9 Kohms
5. Using an ohm meter, check the resistance between secondary terminals for cylinders No. 2 and No. 3.
Resistance
10.3k - 13.9 Kohms
Replace the ignition coil if it fails any of these tests.
OSCILLOSCOPE TEST
Primary Signal Of Ignition Coil
Primary Signal Of Control Relay Scope Pattern
1. Run engine at idle speed.
2. Connect the scope probe to pick-up point #1 (one side at a time) shown in the system schematic diagram and compare each signal to the pattern
shown.
If scope pattern is not as depicted in image, continue with the rest of the test procedures before replacing the assembly.
Control Signal Of Power Transistor
1. Run engine at idle speed.
Power Transistor Control Signal Scope Pattern
2. Connect the scope probe to pick-up point #2 (one side at a time) shown in the system schematic diagram and compare each signal to the pattern
shown.
If scope pattern is not as depicted in image, continue with the rest of the test procedures before replacing the assembly.
HARNESS TEST
1. Disconnect the ignition coil connector and the transistor connector. Turn the key to the ON position.
2. Using a voltmeter, measure the power supply circuit of the ignition coil between the coil harness connector terminal 3 and ground and the transistor
harness connector terminal 5 and ground.
