Dodge Ram Truck 1500-2500-3500. Manual — part 173

LEFT FRONT ISOLATION SOLENOID SHORTED - 47 (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition on.

•

Set Condition:
When there is high logic feedback voltage from the solenoid when it is supposed to be low. (solenoid ener-
gized)

Possible Causes

INTERMITTENT BATTERY VOLTAGE LOW DTC

FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE

FUSED B+ CIRCUIT SHORTED TO FUSED IGNITION SWITCH OUTPUT CIRCUIT

GROUND CIRCUIT OPEN OR HIGH RESISTANCE

CONTROLLER ANTI-LOCK BRAKE

Diagnostic Test

1.

DTC IS ACTIVE

Turn the ignition on.

With the DRBIII

T

, erase DTCs.

Turn the ignition off.

Start the engine.

With the DRBIII

T

read DTCs.

Does the DTC reset?

Yes

>> Go To 2

No

>> Go To 6

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LEFT FRONT ISOLATION SOLENOID SHORTED - 47 (CONTINUED)

2.

FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

NOTE: Before continuing, inspect the fuses that are related to the
ABS system. If one or more is found to be opened, use the sche-
matic and repair the short to ground.
Turn the ignition off.

Disconnect the Controller Anti-lock Brake harness connector.

Check connectors - Clean/repair as necessary.

Turn the ignition on.

Using a 12–volt test light connected to ground, probe the Fused Igni-
tion Switch Output circuit.

NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

>> Go To 3

No

>> Repair the Fused Ignition Switch Output circuit for an open

circuit or high resistance.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

3.

FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE

Using a 12–volt test light connected to ground, probe the Fused B+
circuit.

NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

>> Go To 4

No

>> Repair the Fused B+ circuit for an open circuit or high

resistance.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

DR/DH

BRAKES - ABS - ELECTRICAL DIAGNOSTICS

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LEFT FRONT ISOLATION SOLENOID SHORTED - 47 (CONTINUED)

4.

FUSED B+ CIRCUIT SHORTED TO FUSED IGNITION SWITCH OUTPUT CIRCUIT

Turn the ignition off.

Disconnect the Controller Anti-Lock Brake harness connector.

Using a 12–volt test light connected to ground, probe the Fused Igni-
tion Switch Output circuit.

Does the test light illuminate?

Yes

>> Repair the Fused B+ circuit shorted to the Fused Ignition

Switch Output circuit.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

No

>> Go To 5

5.

GROUND CIRCUIT(S) OPEN OR HIGH RESISTANCE

Turn the ignition off.

Using a 12–volt test light connected to B+, probe both the Ground cir-
cuit.

NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery at
each circuit.

Is the test light illuminated and bright?

Yes

>> Replace the Controller Anti-lock Brake Module in accor-

dance with the Service Information.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

No

>> Repair the Ground circuit(s) for an open circuit or high

resistance.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES/ELECTRICAL - DIAGNOSIS AND TESTING)

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LEFT FRONT ISOLATION SOLENOID SHORTED - 47 (CONTINUED)

6.

INTERMITTENT DTC

Turn the ignition off.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

Check connectors - Clean/repair as necessary.

Inspect the vehicle for aftermarket accessories that may exceed the Charging System output.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

>> Repair as necessary.

Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES/ELECTRICAL - DIAGNOSIS AND
TESTING)

No

>> Test Complete.

DR/DH

BRAKES - ABS - ELECTRICAL DIAGNOSTICS

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