Laser FWD L4-1997cc 2.0L DOHC Turbo (1993)
4. Connect the scope probe to pick-up point #2 shown in the system schematic diagram and compare the power transistor control signal to the pattern
shown.
If scope patterns are not as depicted in images, continue with the rest of the test procedures before replacing the assembly.
HARNESS TEST
1. Disconnect the Power transistor and ignition coil connectors.
2. Measure the voltage between terminal 3 of the ignition coil connector and ground.
Voltage: Battery voltage
3. Measure the voltage between terminal 6 of the power transistor connector and ground.
Voltage: Battery voltage
4. Disconnect the Engine Control Module connector.
5. Using an ohmmeter, check for continuity between the Engine Control Module terminal 109 and the power transistor terminal 4.
Continuity: Should exist
6. Check for a short to ground at the Engine Control Module terminal 109 and the power transistor terminal 4.
Continuity: Should not exist
7. Check for continuity between the ignition coil terminal 1 and the power transistor terminal 1.
Continuity: Should exist
8. Check for continuity between the ignition coil terminal 2 and the power transistor terminal 8.
Continuity: Should exist
9. Check for a short to ground at the ignition coil terminals 1 and 2, and the power transistor terminals 1 and 8.
Continuity: Should not exist
10. Check for continuity between the power transistor terminal 3 and ground.
Continuity: Should exist
11. Reconnect the ECM connector.
12. Using a voltmeter, measure the control signal to the ignition power transistor, with the key in the START position, between terminal 2 and ground,
and terminal 7 and ground.
Voltage: 0.5 - 4.0 volts
13. Measure the voltage between the ignition timing adjustment connector and ground, with the ignition switch in the ON position.
Voltage: 4.0 - 5.2 volts
