Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 200
•
When Monitored:
With the ignition on.
•
Set Condition:
When the Left Rear WSS Signal is intermittently missing a vehicle speed above 25mph (40 kph) or erratic
wheel speed signal during acceleration or sensed wheel speed is different from other wheels.
Possible Causes
LEFT REAR WSS AIR GAP FAULT
LEFT REAR WSS LOOSE — B3, B4 CIRCUITS/CONNECTOR/TERMINAL DAMAGE
LEFT REAR TONE WHEEL DAMAGE
LEFT REAR WHEEL BEARING DAMAGE
IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES
LEFT REAR WSS
ANTI-LOCK BRAKE MODULE
Diagnostic Test
1.
CHECK FOR DTC C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE
NOTE: This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Road test the vehicle over 40 km/h (25 m.p.h.).
NOTE: Vehicle must be driven above 40 km/h (25 m.p.h.) for set conditions to be meet.
With the scan tool, read DTCs.
NOTE: The Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5 mph) before it will extinguish
the ABS indicators.
Does the scan tool display: C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFOR-
MANCE?
Yes
>> Go To 3
No
>> Go To 2
2.
CHECK LEFT REAR WSS AIR GAP
Turn the ignition off.
Using a feeler gauge, measure the Left Rear WSS air gap.
NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications.
Is the Left Rear WSS air gap within specifications?
Yes
>> Go To 3
No
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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3.
CHECK WHEEL SPEED SENSOR SIGNALS
Turn the ignition on.
With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehi-
cle.
NOTE: If graph shows periodic dropouts pay close attention to the tone wheel.
Slowly accelerate as straight as possible from a stop to 40 km/h (25 m.p.h.).
Is the Left Rear WSS speed showing 0 km/h (0 m.p.h.) or not matching other wheel speeds?
Yes
>> Go To 4
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
4.
CHECK FOR IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES
Turn the ignition off.
Check and adjust the Left Rear Tire pressure.
Check and adjust all other tire pressures.
Inspect for mismatched tires on vehicle.
Is the Left Rear Tire improperly inflated or mismatched tires on vehicle?
Yes
>> Repair as necessary
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 5
5.
CHECK LEFT REAR WSS LOOSENESS, INSPECT B4, B5 CIRCUITS/TERMINALS FOR DAMAGE
NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals
Inspect the Anti-Lock Brake Module harness connector, Left Rear WSS, and Left Rear WSS harness connector
Inspect the Left Rear WSS for looseness, excessive corrosion and not properly fastened.
Inspect the (B3) Left Rear WSS Signal and (B4) Left Rear WSS Supply circuits between the Left Rear WSS and
Anti-Lock Brake Module for damage.
Is the Left Rear WSS loose or any of the wiring/connectors/terminals damaged?
Yes
>> Repair as necessary
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 6
6.
CHECK LEFT REAR TONE WHEEL FOR DAMAGE
Inspect the Left Rear Tone Wheel for damage, missing teeth, cracks, or looseness.
NOTE: The Tone Wheel teeth should be perfectly square, not bent, or nicked.
Is the Left Rear Tone Wheel damaged?
Yes
>> Repair as necessary
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 7
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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7.
CHECK LEFT REAR WHEEL BEARING FOR DAMAGE
Inspect the Left Rear wheel bearing for excessive runout or clearance.
NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications.
Is the Left Rear Wheel Bearing Damaged?
Yes
>> Repair as necessary
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Go To 8
8.
LEFT REAR WHEEL SPEED SENSOR
Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
Road test the vehicle over 40 km/h (25 m.p.h.).
NOTE: Vehicle must be driven above 40 km/h (25 m.p.h.) for set conditions to be meet.
With the scan tool, read ABS DTCs.
NOTE: The Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5 mph) before it will extinguish
the ABS indicators.
Did DTC C1027-LEFT REAR WHEEL SPEED SENSOR SIGNAL ERRATIC PERFORMANCE reset?
Yes
>> Replace the Anti-Lock Brakes Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
>> Test Complete.
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C102A-LEFT REAR WHEEL SPEED COMPARATIVE PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
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BRAKES - ABS ELECTRICAL DIAGNOSTICS
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