Test Mm - Spark Timing Check
- If spark advance was not 27-33° in Engine Running Self-Test, place system in Self-Test. System returns to normal 2 minutes after last Self-Test service code is displayed. Spark timing is locked at base timing plus 20°F3° BTDC when Engine Running Self-Test is activated. VECI decal (in engine compartment) will show base timing.
- Connect timing light to engine. Locate spark output (SPOUT) connector and open the connection. Start engine and check base timing. Base timing is 10° (F3°) BTDC except on 1.6L Turbo models which have a base timing of 8°(F3°) BTDC. If timing is correct, go to step 3). If timing is not correct, reconnect SPOUT circuit and set base timing. After timing is adjusted, repeat Engine Running Self-Test and check spark advance.
- Turn key OFF and wait 10 seconds. Disconnect 60-pin connector at ECA. Inspect for and repair any damaged wiring. Connect breakout box. Turn key ON, leaving engine OFF. With DVOM on 20 volt scale, measure voltage between test pins 37 and 40 and between test pins 57 and 60. If either reading is less than 10.5 volts, go to Circuit Test B, step 1). If both readings are 10.5 volts or more, go to next step.
- Turn key OFF and wait 10 seconds. Disconnect harness connector at TFI module. With DVOM on 200 ohm scale, measure SPOUT circuit between SPOUT pin (pin 2) on TFI harness connector and test pin 36. If 5 ohms or less, go to next step. If more than 5 ohms, repair open circuit. Reconnect SPOUT connector and check timing as described in step 1).
- Install breakout box, leave TFI harness disconnected. With key OFF, place DVOM on 200 ohm scale. Measure resistance between test pin 16 and TFI harness connector ignition ground pin (pin 6). If less than 5 ohms, go to TEST A , step 7). If 5 ohms or more, repair harness as required and repeat QUICK TEST.