C1286 (steering sensor bias malfunction) and C1287 (steering sensor rate malfunction). What can be causing these codes? I have recently installed 4:10's and 19/20's. Thanks in advance, Kaley

 

sounds like a bad steering angle sensor

 

Where is this located? How hard is it to replace? Thanks, Kaley

 

it's mounted at the bottom of the steering column

 

On the inside of the car or in the engine bay. It says "Service Active Handling" Would that cause active handling problems? Kaley

 

With RPO JL4
Notes







CIRCUIT DESCRIPTION
Steer angle centering is the process by which the Electronic Brake and Traction Control Module (EBTCM) calibrates the steering sensor output so that it reads zero when the steering wheel is centered. The initial steering wheel center position is calculated after driving 10 Km/h (6 mph) for more than 10 seconds in a straight line on a fairly level surface. The EBTCM uses the Yaw Rate Sensor, Lateral Accelerometer and Wheel Speed Sensors to tell if the vehicle is moving in a straight line. This centering routine is necessary to compensate for wear in the steering and suspension. Wear in the steering and suspension can result in a change in the relationship between the steering wheel and the front wheels. By running the centering routine the EBTCM can compensate for these changes by changing the digital and analog center position.

CONDITIONS FOR SETTING THE DTC


Diagnostic Trouble Code (DTC) C1286 can be set after the centering routines completion if the bias value is plus or minus 40 degrees from the previous bias value.
DTC C1286 can also be set at start up if the bias value was out of range on the last ignition cycle.
ACTION TAKEN WHEN THE DTC SETS
Antilock Brake System (ABS) and Traction Control System (TCS) remain enabled, Active Handling is disabled.


Indicators that turn on:
Car Icon (TCS indicator)
Messages displayed on the Driver Information Center (DIC) :
Service Active HNDLG
Service Vehicle Soon
CONDITIONS FOR CLEARING THE DTC


Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
DIAGNOSTIC AIDS


It is very important to check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a flat surface.
It is very important to find out from the driver when the code was set, (when the SERVICE ACTIVE HNDLG message was activated). This information may help to duplicate the failure.
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation. Refer to Testing for Electrical Intermittents in Diagnostic Aids.
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.


Recenters the Steering Wheel Position Sensor.
Part 1 Of 2





Part 2 Of 2






DTC C1286 STEERING/LATERAL ACCELEROMETER SENSOR BIAS MALFUNCTION (DTC C1286 (RPO JL4))

 

Without RPO JL4
Notes







CIRCUIT DESCRIPTION
The Electronic Brake and Traction Control Module (EBTCM) runs a centering routine when the vehicle speed goes above 30 Km/h (18 mph). When the vehicle reaches 30 Km/h (18 mph), the EBTCM monitors the Steering Wheel Position Sensor (SWPS) inputs (Phase A, Phase B and Analog voltage) to see if the steering wheel is moving. If the steering wheel is not moving for a set period of time then the EBTCM assumes the vehicle is going in a straight line. At this point, the EBTCM looks at the analog voltage signal and reads the voltage. This voltage normally around 2.5V, is then considered the center position and the digital degrees also become zero at the same time. This centering routine is necessary to compensate for wear in the steering and suspension. Wear in the steering and suspension can result in a change in the relationship between the steering wheel and the front wheels. By running the centering routine the EBTCM can compensate for these changes by changing the digital and analog center position.

CONDITIONS FOR SETTING THE DTC


Diagnostic Trouble Code (DTC) C1286 can be set after the centering routines completion if the bias value is ±30 degrees from the previous bias value.
DTC C1286 can also be set at start up if the bias value was out of range on the last ignition cycle.
ACTION TAKEN WHEN THE DTC SETS
Magnasteer 2 is disabled, Antilock Brake System/Traction Control System (ABS/TCS) remains active.


Messages displayed on the Driver Information Center (DIC) :
Service Vehicle Soon
CONDITIONS FOR CLEARING THE DTC


Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
DIAGNOSTIC AIDS
Possible causes:


Steering wheel rotated with steering gear disconnected.
Faulty Steering Wheel Position Sensor.
Faulty Electronic Brake and Traction Control Module (EBTCM) .
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.


Recenters the Steering Wheel Position Sensor (SWPS) .






DTC C1286 STEERING SENSOR BIAS MALFUNCTION (DTC C1286 (WITHOUT RPO JL4))

 

With RPO JL4
Notes







CIRCUIT DESCRIPTION
The Electronic Brake and Traction Control Module (EBTCM) uses three inputs from the Steering Wheel Position Sensor (SWPS) :


Phase A digital input
Phase B digital input
Analog input
This information is used to calculate three things:


The front wheels position when centered.
The front wheels position when turning.
The vehicles lateral acceleration.
The EBTCM runs a centering routine when the vehicle speed goes above 10 Km/h (6 mph). When the vehicle reaches 10 Km/h (6 mph), the EBTCM monitors the SWPS inputs (Phase A, Phase B and Analog voltage) to see if the steering wheel is moving. If the steering wheel is not moving for a set period of time, then the EBTCM assumes the vehicle is going in a straight line. At this point, the EBTCM looks at the analog voltage signal and reads the voltage. This voltage, normally around 2.5V, is then considered the center position and the digital degrees also become zero at the same time. This centering routine is necessary to compensate for wear in the steering and suspension. Wear in the steering and suspension can result in a change in the relationship between the steering wheel and the front wheels.
By running the centering routine the EBTCM can compensate for these changes by changing the digital and analog center position.
The EBTCM uses the digital input (Phase A and Phase B) from the SWPS to calculate the direction the driver of the vehicle is trying to steer during an Antilock Brake System (ABS) and Active Handling event. This information is also used to calculate the vehicles lateral acceleration for Magnasteer 2.

CONDITIONS FOR SETTING THE DTC


Diagnostic Trouble Code (DTC) C1287 can be set any time ignition is present. A fault exists if the steer rate (speed that the steering wheel appears to be turning) exceeds the limits set by the Electronic Brake and Traction Control Module (EBTCM) .
DTC C1287 will set if the analog degrees differs from the digital degrees by more than 25 degrees for 5 seconds when the vehicle is not in an Active Handling event, or 1 second if the vehicle is in an Active Handling event.
ACTION TAKEN WHEN THE DTC SETS
Antilock Brake System (ABS) and Traction Control System (TCS) remain enabled, Active Handling is disabled.


Indicator that turn on:
Car Icon (TCS indicator)
Messages displayed on the Driver Information Center (DIC) :
Service Active HNDLG
Service Vehicle Soon
CONDITIONS FOR CLEARING THE DTC


Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
DIAGNOSTIC AIDS
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.


Checks for normal state change of Phase A and Phase B when turning left.
Checks for normal state change of Phase A and Phase B when turning right.






DTC C1287 STEERING SENSOR RATE MALFUNCTION (DTC C1287 (RPO JL4))

 

Without RPO JL4
Notes







CIRCUIT DESCRIPTION
The Electronic Brake and Traction Control Module (EBTCM) uses four inputs from the Steering Wheel Position Sensor (SWPS) :


Phase A digital input
Phase B digital input
Index pulse
Analog input
This information is used to calculate three things:


The front wheels position when centered.
The front wheels position when turning.
The vehicles lateral acceleration.
The EBTCM runs a centering routine when the vehicle speed goes above 30 Km/h (18 mph). When the vehicle reaches 30 Km/h (118 mph), the EBTCM monitors the SWPS inputs (Phase A, Phase B and Analog voltage) to see if the steering wheel is moving. If the steering wheel is not moving for a set period of time, then the EBTCM assumes the vehicle is going in a straight line. At this point, the EBTCM looks at the analog voltage signal and reads the voltage. This voltage, normally around 2.5V, is then considered the center position and the digital degrees also become zero at the same time. This centering routine is necessary to compensate for wear in the steering and suspension. Wear in the steering and suspension can result in a change in the relationship between the steering wheel and the front wheels.
By running the centering routine the EBTCM can compensate for these changes by changing the digital and analog center position.
The EBTCM uses the digital input (Phase A and Phase B) from the SWPS to calculate the direction the driver of the vehicle is trying to steer during an Antilock Brake System (ABS) event. This information is also used to calculate the vehicles lateral acceleration for Magnasteer 2.

CONDITIONS FOR SETTING THE DTC
Diagnostic Trouble Code (DTC) C1287 can be set any time ignition is present. A fault exists if the steer rate (speed that the steering wheel appears to be turning) exceeds the limits set by the Electronic Brake and Traction Control Module (EBTCM) .

ACTION TAKEN WHEN THE DTC SETS
Magnasteer 2 is disabled, Antilock Brake System/Traction Control System (ABS/TCS) remains active.


Messages displayed on the Driver Information Center (DIC) :
Service Vehicle Soon
CONDITIONS FOR CLEARING THE DTC


Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
Fifty ignition cycles have passed with no DTCs detected.
DIAGNOSTIC AIDS
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.


Checks for normal state change of phase A and Phase B when turning left.
Checks for normal state change of phase A and Phase B when turning right.






DTC C1287 STEERING SENSOR RATE MALFUNCTION (DTC C1287 WITHOUT (RPO JL4))

 

TTT

 

So does this mean that the wheels and tires that I installed are affecting the system? Could they have disconnected something? Before I put the wheels and tires on the car was not doing this. Thanks for the help, Kaley