Dodge Ram Truck 1500-2500-3500. Manual — part 167
INTERNAL MAIN RELAY OPEN — 65
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
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INTERNAL MAIN RELAY OPEN — 65 (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
Solenoid feedback voltage is below the calibrated value. (solenoids do not energize)
Possible Causes
INTERMITTENT BATTERY VOLTAGE LOW DTC
FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE
GROUND CIRCUIT OPEN OR HIGH RESISTANCE
CONTROLLER ANTI-LOCK BRAKE
Diagnostic Test
1.
DTC IS ACTIVE
NOTE: Diagnose and repair any powertrain Charging system DTCs before continuing with this procedure.
NOTE: Ensure the battery is fully charged.
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 5
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
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INTERNAL MAIN RELAY OPEN — 65 (CONTINUED)
2.
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
NOTE: Before continuing, inspect the fuses that are related to the
ABS system.
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)
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
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INTERNAL MAIN RELAY OPEN — 65 (CONTINUED)
4.
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)
5.
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.
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BRAKES - ABS - ELECTRICAL DIAGNOSTICS
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