Failure To Start Test
CAUTION:
Perform IGNITION SYSTEM SPARK TEST first. Failure to do so may result in lost diagnostic time or incorrect test results.
- Ensure sufficient battery voltage (12.4 volts) is present for cranking and ignition systems. Crank engine for 5 seconds while monitoring voltage at coil positive terminal. If voltage remains near zero during cranking, see appropriate article in COMPUTERIZED ENGINE CONTROLS section.
- If reading is close to battery voltage but drops to zero after 1-2 seconds of cranking, see appropriate article in COMPUTERIZED ENGINE CONTROLS section. If voltage remains close to battery voltage for entire 5 seconds, turn ignition off. Remove 14-pin connector from SMEC. Ensure terminals of 14-pin connector are not damaged, causing a poor connection.
- Disconnect ignition coil positive lead. Connect a jumper wire between coil positive terminal and battery positive terminal. Using a jumper wire with a .33 microfarad capacitor, momentarily ground terminal No. 12 of 14-pin connector. A spark should be seen when ground connection is removed.
- If a spark is generated, replace SMEC. If no spark is seen, use jumper wire with capacitor to ground coil negative terminal directly. See Fig 1. If spark is produced, repair wiring harness for an open circuit. If no spark is produced, replace ignition coil.