TEST
ACTION
APPLICABILITY
11
Turn the ignition off.
Disconnect the PCM harness connectors.
Check the Injector Control circuit for an open, short to ground, and short to voltage.
Was a problem found with the Injector Control circuit?
All
Yes
→ Repair the excessive resistance or short in the Injector Control
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 17
12
Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special tool #6539 (5/16
9) #6631(3/89) fuel line adapter and the fuel pressure
gauge between the fuel supply line and the fuel pump module.
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 379 KPa +/- 14 KPa (55 psi +/- 2 psi).
Is the fuel pressure within specification?
All
Yes
→ Repair or replace fuel supply line as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 13
13
Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose,fitting or line, the fuel
system pressure must be released.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.
Is the Fuel Inlet Strainer plugged?
All
Yes
→ Replace the Fuel Pump Inlet Strainer.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ NOTE: Before continuing, check the Fuel Pump Module harness
connector terminals for corrosion, damage, or terminal push out.
Ensure the ground circuit is operating properly. Repair as neces-
sary. Replace the Fuel Pump Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
14
Turn the ignition off.
Remove the ignition wire.
Measure the resistance of the ignition wire.
Is the resistance below 10K ohms?
All
Yes
→ Go To 15
No
→ Replace the Ignition Wire.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
95
DRIVEABILITY - GAS
P0300-MULTIPLE CYLINDER MIS-FIRE —
Continued