Jeep Grand Cherokee WK. Manual — part 160
C121E-BRAKE PRESSURE SENSOR COMPARATIVE PERFORMANCE
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C121E-BRAKE PRESSURE SENSOR COMPARATIVE 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 Pressure Sensor Signal is out of range.
Possible Causes
TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
AIR IN BRAKE SYSTEM/WORN MECHANICAL COMPONENTS
(B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(B986) BRAKE PRESSURE SENSOR RETURN CIRCUIT OPEN
(B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT OPEN
(B84) BRAKE PRESSURE SENSOR SIGNAL AND (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUITS
SHORTED TOGETHER
(B84) BRAKE PRESSURE SENSOR SIGNAL AND (B986) BRAKE PRESSURE SENSOR RETURN CIRCUITS
SHORTED TOGETHER
(B45) STOP LAMP INHIBIT RELAY CONTROL CIRCUIT
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK FOR A DTC C121E-BRAKE PRESSURE SENSOR COMPARATIVE PERFORMANCE
NOTE: If any of the following DTC’s are present they must be repaired before continuing.
C122A-BRAKE PEDAL FORCE SWITCH CIRCUIT
C122B-BRAKE PEDAL FORCE SWITCH CIRCUIT PERFORMANCE
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.
Start the engine.
Depress and release the brake pedal.
With the scan tool, read and record DTC’s.
Does the scan tool display: C121E-BRAKE PRESSURE SENSOR COMPARATIVE PERFORMANCE?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C121E-BRAKE PRESSURE SENSOR COMPARATIVE PERFORMANCE (CONTINUED)
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
3.
CHECK FOR AIR IN BRAKE SYSTEM AND WORN MECHANICAL COMPONENTS
NOTE: Before continuing the brake system must be bled to verify there is no air in the brake system.
NOTE: Visually inspect for worn brake linings, undersized rotors, binding or frozen calipers.
Was there any air in the brake system or base brake issues found?
Yes
>> Repair as needed.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 4
4.
CHECK THE VOLTAGE ON THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the Brake Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (B83) Brake Pressure Sensor Supply cir-
cuit.
Is the voltage above 4 volts?
Yes
>> Go To 8
No
>> Go To 5
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C121E-BRAKE PRESSURE SENSOR COMPARATIVE PERFORMANCE (CONTINUED)
5.
CHECK THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT FOR SHORT TO GROUND
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Measure the resistance between ground and the (B83) Brake Pressure
Sensor Supply circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B83) Brake Pressure Sensor Supply circuit for
a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 6
6.
CHECK THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT FOR SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (B83) Brake Pressure Sensor Supply cir-
cuit.
Is there any voltage present?
Yes
>> Repair the (B83) Brake Pressure Sensor Supply circuit for
a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 7
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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