Dodge Ram Truck 1500-2500-3500. Manual — part 1231

P0351-IGNITION COIL #1 PRIMARY CIRCUIT (CONTINUED)

For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With battery voltage greater than 8 volts during engine cranking or greater than 12 volts with engine running,
engine rpm less than 2016, and none of the coils in dwell when checked.

•

Set Condition:
Peak current is not achieved with battery based dwell plus 1.5 ms of diagnostic offset. It takes less than 3
seconds during cranking or up to 6 seconds while running to set.

Possible Causes

(K343) ASD RELAY OUTPUT CIRCUIT

IGNITION COIL

(K19) IGNITION COIL CONTROL CIRCUIT OPEN

(K19) IIGNITION COIL CONTROL CIRCUIT SHORTED TO GROUND

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

1.

GOOD TRIP EQUAL TO ZERO

Ignition on, engine not running.

With the scan tool, read DTCs and record the related Freeze Frame data.

Is the Good Trip Counter displayed and equal to zero?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDTION Diagnostic Procedure.

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

2.

(K343) ASD RELAY OUTPUT CIRCUIT

Turn the ignition off.

Disconnect the Ignition coil harness connector.

Ignition on, engine not running.

Using a 12-volt test light connected to ground, probe the (K343) ASD
Relay Output circuit at the coil harness connector.

With the scan tool, actuate the ASD Relay.

Does the test light illuminate brightly?

Yes

>> Go To 3

No

>> Inspect the related fuse. Repair the excessive resistance

or short to ground in the (K343) ASD Relay Output circuit.

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

CAUTION: Stop All Actuations

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0351-IGNITION COIL #1 PRIMARY CIRCUIT (CONTINUED)

3.

IGNITION COIL RESISTANCE

Turn the ignition off.

The resistance of a 8.3L Primary Ignition coil is 0.53 to 0.65 of an
ohm.

Measure the resistance of the primary Ignition coil.

Is the resistance within the appropriate specification?

Yes

>> Go To 4

No

>> Replace the Ignition coil.

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

4.

IGNITION COIL

Using a 12-volt test light connected to a 12-volt source, probe the
(K19) IIgnition Coil Driver circuit.

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

What is the condition of the test light while cranking the
engine?

Brightly blinking.

Replace the Ignition Coil.

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

ON constantly.

Go To 5

OFF constantly.

Go To 6

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0351-IGNITION COIL #1 PRIMARY CIRCUIT (CONTINUED)

5.

(K19) IGNITION COIL DRIVER CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Disconnect the C1 PCM harness connector.

Measure the resistance between the (K19) Ignition Coil Control circuit
and ground.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (K19) Ignition Coil Con-

trol circuit.

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

No

>> Go To 7

6.

(K19) COIL DRIVER CIRCUIT OPEN

Turn the ignition off.

Disconnect the C1 PCM harness connector.

Measure the resistance of the (K19) Ignition Coil Control circuit from
the Ignition Coil connector to the PCM connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 7

No

>> Repair the open in the (K19) Ignition Coil Control circuit.

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

7.

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.

If there are no possible causes remaining, view repair.

Repair

Replace and program the Powertrain Control Module per Service Information.

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

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P0352-IGNITION COIL #2 PRIMARY CIRCUIT

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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