Test T - Spark Timing Check
- If spark advance was not 27-33° in Engine Running Self-Test, place system in Self-Test. After last Self-Test service code is displayed, system returns to normal after 2 minutes and spark timing will no longer be locked at 30°.
- Connect timing light to engine. Locate spark output circuit to TFI module and open the connection. Start engine and check base timing. Base timing is 7-13° BTDC. If timing is correct, go to step 3 . If timing is not correct, reconnect spark output circuit and set base timing. After timing is adjusted, repeat QUICK TEST .
- Turn ignition off and wait 10 seconds. Disconnect 60-pin connector at ECA and inspect. Connect breakout box. Turn ignition on. With DVOM on 20 volt scale, measure voltage from box pin 37 to pin 40 and from box pin 57 to pin 60. If either reading is less than 10.5 volts, perform TEST B . If both readings are 10.5 volts or more, go to next step.
- Turn ignition off and wait 10 seconds. Disconnect harness connector at TFI module. With DVOM on 200 ohm scale, measure spark output circuit from spark output pin (pin 2) on TFI harness connector to box pin 36. If 5 ohms or less, continue to next step. If more than 5 ohms, repair open circuit. Check timing as described in step 1 .
- Install breakout box, leave TFI harness disconnected. With ignition off, place DVOM on 200 ohm scale. Measure resistance from box pin 16 to 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 .