TEST
ACTION
APPLICABILITY
8
Check for any of the following conditions/mechanical problems.
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
Are there any engine mechanical problems?
All
Yes
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 18
9
Turn the ignition off.
Disconnect the Fuel Injector harness connector.
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Relay.
Using a 12-volt test light connected to ground, probe the ASD Relay Output circuit at
the Fuel Injector harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 10
No
→ Repair the ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
Turn the ignition off.
Disconnect the Fuel Injector harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to 12-volts, probe the Injector Control circuit.
With the DRBIII
t, actuate the Fuel Injector.
Does the test light blink/flicker?
All
Yes
→ Replace the Fuel Injector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 11
11
Turn the ignition off.
Disconnect the Fuel Injector harness connector.
Disconnect the PCM harness connectors.
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 Injector Control circuit.
Was a problem found with the Injector Control circuit?
All
Yes
→ Repair the Injector Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
350
DRIVEABILITY - NGC
P0300-MULTIPLE CYLINDER MISFIRE —
Continued