TEST
ACTION
APPLICABILITY
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.
15
Turn the ignition off.
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 seconds while observing the test light.
NOTE: The primary resistance of the 4.7L Ignition coil is 0.6 to 0.9 of an ohm
and the resistance of a 5.7L Ignition coil is 0.558 to 0.682 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 16
16
Turn the ignition off.
Disconnect the Ignition Coil harness connector.
Disconnect the PCM harness connectors.
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 17
17
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 in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
96
DRIVEABILITY - SBEC
P0300-MULTIPLE CYLINDER MIS-FIRE —
Continued