Dodge Ram Truck 1500-2500-3500. Manual — part 172
LEFT FRONT ISOLATION SOLENOID OPEN - 45 (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)
5 - 116
BRAKES - ABS - ELECTRICAL DIAGNOSTICS
DR/DH
LEFT FRONT ISOLATION SOLENOID OPEN - 45 (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)
DR/DH
BRAKES - ABS - ELECTRICAL DIAGNOSTICS
5 - 117
LEFT FRONT ISOLATION SOLENOID OPEN - 45 (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.
5 - 118
BRAKES - ABS - ELECTRICAL DIAGNOSTICS
DR/DH
LEFT FRONT ISOLATION SOLENOID SHORTED - 47
DR/DH
BRAKES - ABS - ELECTRICAL DIAGNOSTICS
5 - 119
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