Dodge Ram Truck 1500-2500-3500. Manual — part 1277

*CHECKING THE PCM POWER AND GROUNDS

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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*CHECKING THE PCM POWER AND GROUNDS (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

Possible Causes

(A919) PCM FUSED B+ CIRCUIT

(F202) PCM FUSED IGNITION SWITCH OUTPUT CIRCUIT

(Z130) AND (Z131) PCM GROUND CIRCUITS

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

Diagnostic Test

1.

(A919) PCM FUSED B+ CIRCUIT

Turn the ignition off.

Disconnect the PCM harness connectors.

Using a 12-volt test light connected to ground, probe the (A919) PCM
Fused B+ circuit in the C1 PCM harness connector.

Does the test light illuminate brightly?

Yes

>> Go To 2

No

>> Repair the open in the (A1919) Fused B+ circuit. Inspect

the related fuse and repair as necessary.

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

2.

(F202) PCM FUSED IGNITION SWITCH OUTPUT CIRCUIT

Ignition on, engine not running.

Using a 12-volt test light connected to ground, probe the (F202) PCM
Fused Ignition Switch Output circuit in the C1 PCM harness connector.

Does the test light illuminate brightly?

Yes

>> Go To 3

No

>> Repair the open in the (F202) Fused Ignition Switch Out-

put circuit.

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

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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*CHECKING THE PCM POWER AND GROUNDS (CONTINUED)

3.

(Z130) AND (Z131) PCM GROUND CIRCUITS

Turn the ignition off.

Using a 12-volt test light connected to battery voltage, probe the
(Z130) and (Z131) PCM ground circuits in the C1 PCM harness con-
nector.

Does the test light illuminate brightly?

Yes

>> Test Complete.

No

>> Repair the open in the (Z130) and (Z131) PCM ground cir-

cuits.

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

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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STANDARD PROCEDURE

POWERTRAIN VERIFICATION TEST

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

Diagnostic Test

1.

SELECTING THE PROPER VERIFICATION TEST

The following verification test are for different repairs. Select the appropriate Verification test for the
repair that has been completed.

Speed Control repair

Go To 2

Charging System repair

Go To 3

NVLD System repair

Go To 4

All other repairs

Go To 5

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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