Jeep Grand Cherokee WK. Manual — part 163
C1222-BRAKE PEDAL TRAVEL SENSOR/BRAKE PRESSURE SENSOR CORRELATION (CONTINUED)
7.
CHECK THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT FOR AN OPEN
Turn the ignition off.
Measure the resistance of the (B83) Brake Pressure Sensor Supply
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 (B83) Brake Pressure Sensor Supply circuit for
an open.
Perform ABS VERIFICATION TEST - VER 1.
8.
CHECK THE RESISTANCE TO GROUND ON THE (B986) BRAKE PRESSURE SENSOR RETURN CIRCUIT
Turn the ignition off.
Measure the resistance between the (B986) Brake Pressure Sensor
Return Circuit and ground.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the (B986) Brake Pressure Sensor Return circuit
for an open.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C1222-BRAKE PEDAL TRAVEL SENSOR/BRAKE PRESSURE SENSOR CORRELATION (CONTINUED)
9.
CHECK THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT OUTPUT
Turn the ignition off.
Reconnect the Brake Pressure Sensor harness connector.
Start the engine.
While back probing, measure the voltage of the (B84) Brake Pressure
Sensor Signal circuit at the Brake Pressure Sensor harness connector
while depressing and releasing the brake pedal.
Is the voltage between 0.50 volts to 4.55 volts?
Yes
>> Go To 13
No
>> Go To 10
10.
CHECK THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Measure the resistance of the (B84) Brake Pressure Sensor Signal cir-
cuit.
Is the resistance below 5.0 ohms?
Yes
>> Go To 11
No
>> Repair the (B84) Brake Pressure Sensor Signal circuit for
an open.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 279
C1222-BRAKE PEDAL TRAVEL SENSOR/BRAKE PRESSURE SENSOR CORRELATION (CONTINUED)
11.
CHECK FOR A SHORT BETWEEN THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT AND THE
(B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT
Measure the resistance between the (B84) Brake Pressure Sensor
Signal circuit and the (B83) Brake Pressure Sensor Supply circuit.
Is the resistance below 150 ohms?
Yes
>> Repair the (B83) Brake Pressure Sensor Supply and (B84)
Brake Pressure Sensor Signal circuits for a short together.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 12
12.
CHECK FOR A SHORT BETWEEN THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT AND THE
(B986) BRAKE PRESSURE SENSOR RETURN CIRCUIT
Measure the resistance between the (B84) Brake Pressure Sensor
Signal and the (B986) Brake Pressure Sensor Return circuit.
Is the resistance below 150 ohms?
Yes
>> Repair the (B84) Brake Pressure Sensor Signal and
(B986) Brake Pressure Sensor Return circuits for a short
together.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 13
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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C1222-BRAKE PEDAL TRAVEL SENSOR/BRAKE PRESSURE SENSOR CORRELATION (CONTINUED)
13.
CHECK THE (D45) STOP LAMP INHIBIT RELAY CONTROL OPERATION
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Turn the ignition on.
Measure the voltage on the (D45) Stop Lamp Inhibit Relay Control cir-
cuit while depressing and releasing the brake pedal.
Does the voltage toggle from approximately 0 to 12 volts?
Yes
>> Replace the Anti-Lock Brake Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Repair as needed.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 281
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