Dodge Ram Truck 1500-2500-3500. Manual — part 918
P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED)
2.
(B29) BRAKE SWITCH NO.1 SIGNAL SHORTED TO GROUND
Turn the ignition off.
Disconnect the Stop Lamp Switch harness connector.
Disconnect the C3 PCM harness connector.
Measure the resistance between ground and the (B29) Brake Switch
No.1 Signal circuit in the Stop Lamp Switch harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (B29) Brake Switch No.1
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
3.
(V32) BRAKE SWITCH NO.2 SIGNAL CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (V32) Brake Switch No.2 Signal circuit
from the Stop Lamp Switch harness connector to the appropriate ter-
minal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the open in the (V32) Brake Switch No.2 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9 - 594
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED)
4.
(V32) BRAKE SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (V32) Brake Switch
No.2 Signal circuit in the Stop Lamp Switch harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (V32) Brake Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(Z429) GROUND CIRCUIT OPEN
Measure the resistance between ground and the (Z429) Ground circuit
in the Stop Lamp Switch harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (Z429) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
6.
STOP LAMP SWITCH
Measure the resistance between the (Z429) Ground circuit terminal and the (B29) Brake Switch No.1 Signal terminal
in the Stop Lamp Switch.
Next, measure the resistance between the (V30) Fused Igniton Switch circuit terminal and the (V32) Brake Switch
No.2 Signal circuit terminal in the Stop Lamp Switch.
Apply and release the brake pedal while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to an open circuit for one or both of the measurements
taken?
Yes
>> Go To 7
No
>> Replace the Stop Lamp Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 595
P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 596
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0572-BRAKE SWITCH 1 STUCK ON
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 597
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