Jeep Grand Cherokee WK. Manual — part 166
C122A-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT (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.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122B-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT PERFORMANCE
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C122B-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT PERFORMANCE (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 implausible.
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 C122B-BRAKE PEDAL FORCE SWITCH CIRCUIT PERFORMANCE
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: C122B-BRAKE PEDAL FORCE SWITCH CIRCUIT PERFORMANCE?
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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C122B-BRAKE BOOSTER PEDAL FORCE SWITCH CIRCUIT PERFORMANCE (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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