Test 1: Power Supply Check
- Disconnect MCU control terminals at MCU. Turn ignition on, and check for battery voltage at terminals 29 and 41. If battery voltage is present, go to step 2 . If no voltage at terminals, check main relay, starter switch, fuses, fusible link and circuits.
- Check for continuity between terminals 38 and 39 and ground. If ohmmeter does not show continuity to ground, check ground connection, terminal ends and wires.