Test AB: No Start - ALT Fuel Switch Indicator Is Off

AB1 - AB4:

AB5 - AB6:

This pinpoint test is intended to diagnose only the following:
- ALT fuel relay module
- Compuvalve
- Harness circuits

NOTE: If the vehicle is equipped with a dual LPG tank option, be sure to check ALT operation in both LPG positions of the ALT/GAS switch.