Chart A-5 Fuel System Diagnosis

Fig. 106 - WIRING DIAGRAM for Chart A-5 Fuel System Diagnosis. VIN P:

CHART A-5

FUEL SYSTEM DIAGNOSIS

2.0L "J" SERIES

FUEL INJECTION (TBI)

Fig. 105 - Chart A-5 - Fuel System Diagnosis:

When the ignition switch is turned "ON", the Electronic Control Module (ECM) will turn "ON" the in-tank fuel pump. It will remain "ON" as long as the engine is cranking or running, and the ECM is receiving HEI distributor reference pulses.
If there are no reference pulses, the ECM will shut "OFF" the fuel pump within 2 seconds after key "ON".
The pump will deliver fuel to the TBI unit, where the system pressure is controlled to 62 to 90 kPa (9 to 13 psi). Excess fuel is then returned to the fuel tank.
The fuel pump test terminal is located in the left side of the engine compartment. When the engine is stopped, the pump can be turned "ON" by applying battery voltage to the test terminal.
Improper fuel system pressure can result in one of the following symptoms:
a. Cranks but won't run.
b. Code 44
c. Code 45
d. Cuts out, may feel like ignition problem.
e. Poor fuel economy, loss of power.
f. Hesitation.