Diagnostic Notes

PRE-CHECKS:
1. Check for adequate fuel supply in fuel tank. Do not rely on fuel gauge.
2. Verify battery is fully charged.
3. Verify fuse/fuse link integrity.
4. Inspect all hoses, fuel lines, and connections for fuel leaks, kinks and proper routing.
5. Verify correct fuel type and quality.
6. Check TSB's for fuel system design updates.

SPECIAL SERVICE TOOLS






ROTUNDA EQUIPMENT


To prevent the replacement of good components, the following areas may be at fault:

- Battery and charging system low (fuse integrity).

- Contamination within the Idle Air Control (IAC) device.

- Contamination of fuel.

- Octane rating.

- Plugged or restricted fuel filter.


- Engine not reaching operating temperature.

- Cooling system (low/leaking).

- PCV system (incorrect / clogged).


- Transmission, Clutch integrity.

- Brakes (not releasing).

- Ignition system.

- Exhaust system, EGR.

- Vacuum leaks (air intake manifold, vacuum hoses, vacuum reservoirs, power brake booster, as applicable).


Verify

- Transmission in PARK or NEUTRAL.

- Parking brake applied (automatic brake release disconnected where applicable).

- Wheels blocked.

- Transmission fluid integrity.

- Transmission shift timing.

- Adequate fuel supply in the tank.

- Fuel system integrity (leaks, restricted or damage).

- Fuel system electrical integrity (Inertia Fuel Shutoff (IFS) switch).

- Generator belt tension.

- Heater and accessories off.

- Throttle lever is resting on the throttle plate stop screw.

- EEC-IV/EEC-V diagnostics have been performed and the vehicle malfunction indicated by Diagnostic Trouble Codes (DTCs) has been resolved.