Chart 2 of 3

Diagnostic Chart:

Engine Cranks But Won't Start:

At this point in diagnosing a no start condition it has been determined that the ECM inputs and the ignition system are OK. This chart will diagnose the fuel delivery system.

TEST DESCRIPTIONS
1. When the ignition is turned On, the fuel pump relay should be energized for about 2 seconds. After connecting fuel pressure gauge the ignition may have to be cycled a few times before reaching the specified pressure A Scan tool can also be used to prime the fuel system. If pressure is available, but low, it indicates the ECM and fuel pump relay circuit is OK.
2. The ignition must be Off for about 10 seconds before the fuel pump relay will be re-energized. If test light illuminates at FUEL PUMP fuse, ECM control and relay are OK.
3. The ECM sends 12 volts to relay coil.