Dodge Ram Truck 1500-2500-3500. Manual — part 1211

P0305-CYLINDER #5 MISFIRE (CONTINUED)

11.

INJECTOR CONTROL CIRCUIT

Turn the ignition off.

Disconnect the PCM harness connector.

Check the (K38) Injector Control circuit for an open or short to ground.

Was a problem found with the Injector Control circuit?

Yes

>> Repair the excessive resistance or short in the Injector

Control circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 17

12.

FUEL SUPPLY LINE RESTRICTED

Turn the ignition off.

WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser-
vicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow
these instructions can result in personal injury or death.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.

Install special tool #6539 (5/16

9

) #6631(3/8

9

) fuel line adapter and the fuel pressure gauge between the fuel supply

line and the fuel pump module.

Ignition on, engine not running.

With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge.

NOTE: Fuel pressure specification is 379 KPa +/- 14 KPa (55 psi +/- 2 psi).

Is the fuel pressure within specification?

Yes

>> Repair or replace fuel supply line as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 13

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P0305-CYLINDER #5 MISFIRE (CONTINUED)

13.

FUEL PUMP INLET STRAINER

Turn the ignition off.

WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or ser-
vicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow
these instructions can result in personal injury or death.
Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer.

Is the Fuel Inlet Strainer plugged?

Yes

>> Replace the Fuel Pump Inlet Strainer.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Before continuing, check the Fuel Pump Module harness connector terminals for corrosion, damage, or

terminal push out. Make sure the ground circuit is functional. Repair as necessary. Replace the Fuel
Pump Module.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

14.

IGNITION WIRE

NOTE: If the vehicle being tested does not have an ignition wire answer YES to this test and continue.
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

>> Replace the Ignition Wire.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

15.

IGNITION COIL

Disconnect the Ignition Coil harness connector.

Remove the Fuel Pump Relay.

Using a 12-volt test light connected to 12-volts, probe the (K17) Coil
Control circuit.

Crank the engine for 5 seconds while observing the test light.

NOTE: The primary resistance of the 8.3L Ignition coil is 0.53 to
0.65 of an ohm at 77°F (25°C).

Does the test light brightly blink/flicker?

Yes

>> Replace the Ignition Coil.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 16

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0305-CYLINDER #5 MISFIRE (CONTINUED)

16.

COIL CONTROL CIRCUIT

Turn the ignition off.

Disconnect the PCM harness connector.

Check the (K17) Coil Control circuit for an open, short to ground, and
short to voltage.

Was a problem found with the Coil Control circuit?

Yes

>> Repair the Coil Control circuit.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 17

17.

PCM

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.

Were there any problems found?

Yes

>> Repair as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Replace and program the Powertrain Control Module per Service Information.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0306-CYLINDER #6 MISFIRE

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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