No Start Test
This test identifies faults in the MCU only, not other causes of No-Start condition.
- Turn ignition off. Disconnect coil "horseshoe" shaped connector from coil, and vehicle harness from ignition module (4-wire connector). Check resistance between coil connector "Tach Test" terminal and ground. If resistance is less than 1K ohms, go to next step. If greater than 1K ohms, MCU is okay.
- Disconnect vehicle harness connector at MCU. Measure resistance between Pin No. 8 of harness connector and ground. See Fig 1 . If greater than 1K ohms, replace MCU and re-test. If less than 1K ohms, repair circuit from MCU to ignition coil connector, and re-test.