- Important Preliminary Checks

BEFORE STARTING
Before using this section you should have performed the DIAGNOSTIC CIRCUIT CHECK and found out that:
1. The ECM and "CHECK ENGINE" light are operating.
2. There are no trouble codes stored, or there is a trouble code but no "CHECK ENGINE" light.
3. The fuel control system is operating OK (by performing Field Service Mode Check).
Verify the customer complaint, and locate the correct SYMPTOM below. Check the items indicated under that symptom.
If the ENGINE CRANKS BUT \WILL NOT RUN, see CHART A-3. Chart A-3A & A-3B Engine Cranks But Won't Run
Several of the symptom procedures below call for a careful visual check. This check should include:
^ Vacuum hoses for splits, kinks, and proper connections, as shown on Emission Control Information label.
^ Air leaks at throttle body mounting and intake manifold.
^ Ignition wires for cracking, hardness, proper routing. and carbon tracking.
^ wiring for proper connections, pinches, and cuts.
The importance of this step cannot be stressed too strongly - it can lead to correcting a problem without further checks and can save valuable time.
The following symptoms cover several engines. To determine if a particular system or component is used refer to the ECM wiring diagrams for application.