Vehicle Check/Preparation

Before using the diagnostic tool to perform any test, refer to the important Safety Notice and the necessary visual checks listed below.

Visual Checks
^ Inspect the air cleaner and inlet ducting.
^ Check all engine vacuum hoses for damage, leaks, cracks, kinks and proper routing.
^ Check the system wiring harness for proper connections, bent or broken pins, corrosion, loose wires and proper routing.
^ Check the alternative fuel tank(s) for adequate LPG level.
^ Verify the fuel filter is not installed backwards.
^ Check the Powertrain Control Module (PCM), sensors and actuators for physical damage.
^ Check the compuvalve, sensors and actuators for physical damage.
^ Check the engine coolant for proper level and mixture.
^ Check the transmission fluid level and quality.
^ Check for TSB and SPECIAL SERVICE messages.
^ Make all necessary repairs before continuing with Diagnostic Quick Test.

Vehicle Preparation
^ Perform ALL safety steps required to start and run vehicle tests. Apply the parking brake, place shift lever firmly into PARK position and block the drive wheels.
^ Turn off ALL electrical loads: radios, lamps, A/C, blower and fans.
^ Start the engine and bring up to normal operating temperature before running Diagnostic Quick Test.

NOTE: Vehicles equipped with LPG fuel systems will only start in ALT fuel mode with CHT temperatures above -25°C (-13°F). Below this point, liquid propane cannot vaporize.

It may be necessary to bring the vehicle to operating temperature in gasoline mode before switching to or restarting in ALT fuel mode. REFER to Description and Operation, Bi-Fuel Switch-Over Pressures and Temperatures. Description and Operation