TEST
ACTION
APPLICABILITY
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
Disconnect the Ignition Coil harness connector.
Remove the Fuel Pump Relay or ASD Relay.
Using a 12-volt test light connected to 12-volts, probe the Ignition Coil Control
circuit.
Crank the engine for 5 second while observing the test light.
NOTE: The resistance of the primary Ignition Coil on a 3.7L is 0.6 to 0.9 of an
ohm at 77°F (25°C).
Does the test light brightly blink/flicker?
All
Yes
→ Replace the Ignition Coil.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 15
15
Turn the ignition off.
Disconnect the C2 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Check the Coil Control circuit for an open, short to ground, and short to voltage.
Was a problem found with the Coil Control circuit?
All
Yes
→ Repair the Coil Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 16
16
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
121
DRIVEABILITY - NGC
P0300-MULTIPLE CYLINDER MISFIRE —
Continued