Dodge 2004 Neon SX2 Diagnostic Manual page 462

DRIVEABILITY - NGC
P0300-MULTIPLE CYLINDER MISFIRE —
TEST
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?
Yes → Repair as necessary.
→ Go To 18
No
9 Turn the ignition off.
Disconnect the Fuel Injector harness connector.
Ignition on, engine not running.
With the DRBIII , 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?
Yes → Go To 10
→ Repair the ASD Relay Output circuit.
No
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 , actuate the Fuel Injector.
Does the test light blink/flicker?
Yes → Replace the Fuel Injector.
→ Go To 11
No
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?
Yes → Repair the Injector Control circuit.
→ NOTE: Before continuing, check the PCM harness connector
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
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 - NGC.
Continued
126
APPLICABILITY
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