Dodge 2004 Neon SX2 Diagnostic Manual page 463

P0300-MULTIPLE CYLINDER MISFIRE —
TEST
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 5/16 fuel line adapter tool #6539 between the disconnected fuel line
and the fuel pump module.
Attach a fuel pressure test gauge to the T fitting on the tool #6539
Ignition on, engine not running.
With the DRBIII , actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Is the fuel pressure within specification?
Yes → Repair or replace fuel supply line as necessary.
No
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?
Yes → Replace the Fuel Pump Inlet Strainer.
No
14 Turn the ignition off.
Remove the ignition wire.
Measure the resistance of the ignition wire.
Is the resistance below 10K ohms?
Yes → Go To 15
No
15 Turn the ignition off.
Disconnect the Ignition Coil 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 Ignition Coil harness connector.
Does the test light illuminate brightly?
Yes → Go To 16
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Go To 13
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ 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 - NGC.
→ Replace the Ignition Wire.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Repair the ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
Continued
127
APPLICABILITY
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All
All
All