Jeep Liberty KJ. Manual — part 843
•
When Monitored:
When the vehicle is driven.
•
Set Condition:
If the Anti-Lock Brakes Module detects an implausible signal from the Stop Lamp Switch.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
STOP LAMP RELATED DTCs OR SYMPTOMS PRESENT (F942 CIRCUIT/FUSE OPEN)
PRESSURE SENSOR OR VOLTAGE RELATED DTCs PRESENT
(B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL
CIRCUIT (GAS) SHORTED TO GROUND
(B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1 SIGNAL
CIRCUIT (GAS) OPEN
STOP LAMP SWITCH
ANTI-LOCK BRAKES MODULE
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Diagnose and repair all Pressure Sensor and Voltage related DTCs and all Stop Lamp related DTCs
and symptoms before diagnosing this DTC.
Turn the ignition on.
With the scan tool, read ABS DTCs.
With the scan tool, read and record Environmental Data (EV Data).
With the scan tool, erase DTCs.
Cycle the ignition switch.
WARNING: Ensure brake capability is available before road testing.
Test drive the vehicle as follows: Either drive for more than 5 minutes at a speed greater than 40 km/h (25 m.p.h.)
or accelerate to a speed greater than 40 km/h (25 m.p.h.) and then decelerate to a speed lower than 3 km/h (2
m.p.h.) five consecutive times.
Park the vehicle.
With the scan tool, read ABS DTCs.
Does this DTC reset?
Yes
>> Go To 2
No
>> Perform the ABS Intermittent Condition diagnostic procedure in this Section.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
2.
INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS
Turn the ignition off.
Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded terminals.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 3
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
3.
CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1
SIGNAL CIRCUIT (GAS) FUNCTION WHILE DEPRESSING & RELEASING THE BRAKE PEDAL
Disconnect the Anti-Lock Brakes Module harness connector.
Turn the ignition on.
Using a 12-volt test light connected to 12 volts, backprobe the (B15)
Secondary Brake Switch Signal circuit (Diesel) or the (B15) Brake
Switch No. 1 Signal circuit (Gas) in the Anti-Lock Brakes Module har-
ness connector.
Depress and release the brake pedal.
Does the test light illumination toggle from off to on?
Yes
>> Replace the Anti-lock Bakes Module in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 4
4.
CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1
SIGNAL CIRCUIT (GAS) FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Stop Lamp Switch harness connector.
Measure the resistance of the (B15) Secondary Brake Switch Signal cir-
cuit (Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas)
between ground and the Anti-Lock Brakes Module harness connector.
Is the resistance below 10k ohms?
Yes
>> Repair the (B15) Secondary Brake Switch Signal circuit
(Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas)
for a short to ground.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Go To 5
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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5.
CHECK (B15) SECONDARY BRAKE SWITCH SIGNAL CIRCUIT (DIESEL) OR (B15) BRAKE SWITCH NO. 1
SIGNAL CIRCUIT (GAS) FOR AN OPEN
Measure the resistance of the (B15) Secondary Brake Switch Signal cir-
cuit (Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas)
between the Anti-Lock Brakes Module harness connector and the Stop
Lamp Switch harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Stop Lamp Switch in accordance with the Ser-
vice Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
No
>> Repair the (B15) Secondary Brake Switch Signal circuit
(Diesel) or the (B15) Brake Switch No. 1 Signal circuit (Gas)
for an open.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 -
BRAKES - STANDARD PROCEDURE).
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
KJ
C1210–G SENSOR INPUT CIRCUIT PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
5 - 135
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