Jeep Grand Cherokee WK. Manual — part 164
C122A-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122A-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT (CONTINUED)
For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
When the Anti-Lock Brake Module indicates that the Brake Pedal Force Switch signals are invalid or not avail-
able.
Possible Causes
TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
(B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
BRAKE TRAVEL SENSOR
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK FOR A DTC C122A-BRAKE PEDAL FORCE SWITCH CIRCUIT
NOTE: This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, read and record DTC’s.
With the scan tool, read and record Freeze Fame information.
With the scan tool, erase DTC’s.
CAUTION: Ensure brake capability is available before road testing.
Test drive vehicle above 24 k/mh (15 mph).
With the scan tool, read and record DTC’s.
Does the scan tool display: C122A-BRAKE PEDAL FORCE SWITCH CIRCUIT?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
2.
CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE
Check all related wiring for bruised, chafed, pierced, or partially broken wires.
Check all related connectors for broken, bent, pushed out, or corroded terminals.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 3
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122A-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT (CONTINUED)
3.
CHECK THE VOLTAGE ON THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT
Turn the ignition on.
Measure the voltage of the (B134) Brake Pedal Force Switch Close
circuit by back probing at the Brake Travel Sensor harness connector.
Is the voltage approximately 6 volts?
Yes
>> Go To 7
No
>> Go To 4
4.
CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Travel Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (B134) Brake Pedal Force Switch Close
circuit.
Is there any voltage present?
Yes
>> Repair the (B134) Brake Pedal Force Switch Close circuit
for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (B134) Brake Pedal
Force Switch Close circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B134) Brake Pedal Force Switch Close circuit
for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 6
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122A-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT (CONTINUED)
6.
CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR AN OPEN
Measure the resistance of the (B134) Brake Pedal Force Switch Close
circuit.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Anti-Lock Brake Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Repair the (B134) Brake Pedal Force Switch Close circuit
for an open.
Perform ABS VERIFICATION TEST - VER 1.
7.
CHECK THE VOLTAGE ON THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT
Measure the voltage of the (B135) Brake Pedal Force Switch Open
circuit by back probing at the Brake Travel Sensor harness connector.
Is the voltage approximately 12 volts?
Yes
>> Go To 11
No
>> Go To 8
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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