Jeep Grand Cherokee WK. Manual — part 159
C121D-BRAKE PRESSURE SENSOR CIRCUIT (CONTINUED)
8.
CHECK THE RESISTANCE TO GROUND ON THE (B986) BRAKE PRESSURE RETURN CIRCUIT
Turn the ignition off.
Measure the resistance between the (B986) Brake Pressure Return
Circuit and ground.
Is the resistance below 5.0 ohms?
Yes
>> Go To 12
No
>> Go To 9
9.
CHECK THE (B986) BRAKE PRESSURE SENSOR RETURN CIRCUIT FOR SHORT TO GROUND
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Measure the resistance between ground and the (B986) Brake Pres-
sure Sensor Return circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B986) Brake Pressure Sensor Return circuit
for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 10
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C121D-BRAKE PRESSURE SENSOR CIRCUIT (CONTINUED)
10.
CHECK THE (B986) BRAKE PRESSURE SENSOR RETURN CIRCUIT FOR SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (B986) Brake Pressure Sensor Return cir-
cuit.
Is there any voltage present?
Yes
>> Repair the (B986) Brake Pressure Sensor Return circuit
for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 11
11.
CHECK THE (B986) BRAKE PRESSURE SENSOR RETURN CIRCUIT FOR AN OPEN
Turn the ignition off.
Measure the resistance of the (B986) Brake Pressure Sensor Return
circuit.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Anti-Lock Brake Module in accordance with
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Repair the (B986) Brake Pressure Sensor Return circuit
for an open.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 263
C121D-BRAKE PRESSURE SENSOR CIRCUIT (CONTINUED)
12.
CHECK THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT OUTPUT
Turn the ignition off.
Reconnect the Anti-Lock Brake Module harness connector.
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
>> Replace the Anti-Lock Brake Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 13
13.
CHECK THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Measure the resistance between ground and the (B84) Brake Pressure
Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B84) Brake Pressure Sensor Signal circuit for
a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 14
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C121D-BRAKE PRESSURE SENSOR CIRCUIT (CONTINUED)
14.
CHECK THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (B84) Brake Pressure Sensor Signal cir-
cuit.
Is there any voltage present?
Yes
>> Repair the (B84) Brake Pressure Sensor Signal circuit for
a short to voltage.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 15
15.
CHECK THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
Turn the ignition off.
Measure the resistance of the (B84) Brake Pressure Sensor Signal cir-
cuit.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Brake Pressure Sensor in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Repair the (B137) Brake Pressure Sensor Signal circuit for
an open.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 265
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