Jeep Grand Cherokee WK. Manual — part 168
C122B-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT PERFORMANCE (CONTINUED)
14.
CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR AN OPEN
Measure the resistance of the (B136) Brake Pedal Force Switch Signal
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 (B136) Brake Pedal Force Switch Signal circuit
for an open.
Perform ABS VERIFICATION TEST - VER 1
.
15.
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.
Depress and hold the brake pedal.
Is the voltage approximately 12 volts?
Yes
>> Go To 16
No
>> Replace the Brake Travel Sensor in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122B-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT PERFORMANCE (CONTINUED)
16.
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.
Depress and hold the brake pedal.
Is the voltage approximately 6 volts?
Yes
>> Go To 17
No
>> Replace the Brake Travel Sensor in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
17.
CHECK THE VOLTAGE ON THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT
Measure the voltage of the (B136) Brake Pedal Force Switch Signal
circuit by back probing at the Brake Travel Sensor harness connector.
Depress and hold the brake pedal.
Is the voltage approximately 6 volts?
Yes
>> Replace the Anti-Lock Brake Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Replace the Brake Travel Sensor in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122C-ACTIVE BRAKE BOOSTER CONTROL CIRCUIT SUPPLY VOLTAGE
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122C-ACTIVE BRAKE BOOSTER CONTROL CIRCUIT SUPPLY VOLTAGE (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 the Active Brake Booster circuit fails the diagnostic test.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
(B131) ACTIVE BRAKE BOOSTER SOLENOID (+) CIRCUIT SHORTED TO (B984) BRAKE PRESSURE
SENSOR RETURN CIRCUIT
(B131) ACTIVE BRAKE BOOSTER SOLENOID (+) CIRCUIT SHORTED TO GROUND, VOLTAGE, OR OPEN
BRAKE TRAVEL SENSOR
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK FOR A DTC C122C-ACTIVE BRAKE BOOSTER CONTROL CIRCUIT SUPPLY VOLTAGE
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.
Cycle the ignition switch from off to on.
With the scan tool, read and record DTCs
Does the scan tool display: C122C-ACTIVE BRAKE BOOSTER CONTROL CIRCUIT SUPPLY VOLTAGE?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
2.
CHECK THE WIRING HARNESS, TERMINALS, AND CONNECTORS
Visually inspect the related wiring harness. Look for any bruised, chafed, pierced, or partially broken wires.
Visually inspect the related wiring harness connectors. Look 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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