Dodge Ram Truck 1500-2500-3500. Manual — part 1101
P0572-LOW VOLTAGE DETECTED AT THE BRAKE SWITCH
9 - 1326
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0572-LOW VOLTAGE DETECTED AT THE BRAKE SWITCH (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:
While the ignition is on
•
Set Condition:
The brake switch status is = to OFF and the not brake switch status is = to ON for a calibrated amount of
time..
Possible Causes
DAMAGED WIRING HARNESS OR CONNECTORS
BRAKE SWITCH CIRCUIT SHORTED TO GROUND (BRAKE SWITCH WILL ALWAYS BE OFF)
BRAKE SWITCH
ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.
BRAKE SWITCH CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the brake switch connection. Inspect the pins and connec-
tor for damage, corrosion, etc.
Disconnect the ECM connectors. Inspect the pins and connector for
damage, corrosion, etc.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the brake switch circuit in the ECM
connector and battery negative.
Is the resistance less than 10 ohms?
Yes
>> Repair the Brake switch circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
No
>> Go To 2
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1327
P0572-LOW VOLTAGE DETECTED AT THE BRAKE SWITCH (CONTINUED)
2.
BRAKE SWITCH CIRCUIT SHORTED TO OTHER CIRCUITS IN HARNESS
Measure the resistance between the brake switch wire in the ECM
connector and all other pins in the ECM connector.
Is the resistance less than 10 ohms?
Yes
>> Repair or replace the harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
No
>> Go To 3
3.
ECM
Reconnect the ECM connectors.
Measure the resistance between the brake switch circuit at the switch
connector and battery negative.
Is the resistance less than 10 ohms?
Yes
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
No
>> Go To 4
9 - 1328
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0572-LOW VOLTAGE DETECTED AT THE BRAKE SWITCH (CONTINUED)
4.
Reconnect the brake switch connector.
Using the scan tool, clear the DTC’s.
Turn the ignition on.
Cycle the brake pedal several times.
Using the scan tool, read the DTC’s.
Has the brake switch low DTC returned?
Yes
>> Replace the brake switch.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Perform Intermittent condition test. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1329
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