C1504–TIRE PRESSURE SENSOR 4 INTERNAL





For a complete wiring diagram Refer to Section 8W

Theory of Operation


The tire pressure sensor actively monitors the air pressure and air temperature inside the tire, the sensor internal battery status, and the radial acceleration of the wheel. Each sensor has a unique ID code. The sensor transmits the data at regular intervals via an encoded signal to a receiver circuit located in the Wireless Control Module (SKREEM).


  • When Monitored:

    With vehicle speed greater than 15 m.p.h. (24 km/h).

  • Set Condition:

    The WCM (SKREEM) will monitor the signals from the four active road tire sensors. A loss of signal error is detected when eight consecutive blocks of data are not received or cannot be accurately decoded. An internal sensor hardware error condition will be set when an error in the accelerometer, pressure sensor, or temperature sensor is detected.


Possible Causes
  
INTERMITTENT TIRE PRESSURE SENSOR INTERNAL DTC
  
TIRE PRESSURE SENSOR
  
WIRELESS CONTROL MODULE (SKREEM)
  



Diagnostic Test

1.

NOTE: If the incorrect Placard Values were programmed into the WCM/SKREEM, a DTC could be set. Before continuing with any TPM diagnostic test, using the scan tool, check that the correct Placard Values have been programmed in to the module.

NOTE:

If the following conditions are present:

– Low Tire Pressure DTC (Stored)

– Tire Pressure Sensor Internal DTC (Active)

– Spare Tire is not equipped with a Tire Pressure Sensor

– Spare Tire is currently on the vehicle

Repair the tire and place it back on the vehicle.

Test drive the vehicle.

If the DTC(s) reset continue with the diagnostic procedure.





Is the DTC status Active at this time?

Yes
  • Go to 2


No
  • Go to 4

2.TIRE PRESSURE SENSOR

NOTE:

When working with vehicles equipped with the base tire pressure monitoring system the correct tire that set the fault must be identified. Following the below procedure will help in identifying the correct tire.

1. Set all tire pressures to the recommended specifications and recheck for fault/alert.

2. Turn the ignition on.

3. Starting with the left front wheel, deflate the tire to 20 PSI and wait 2 minutes. The fault will set once the pressure has reached 20 PSI within the 2 minute time frame.

4. If the TPM fault was detected and not associated to this Sensor/Transmitter, repeat the process until the faulty Sensor/Transmitter has been identified.








Does the DTC reset or is the status Active for this DTC?

Yes
  • Go to 3


No
  • Test Complete.

3.WIRELESS CONTROL MODULE (SKREEM)





Repair
  • Replace the Wireless Control Module (SKREEM) in accordance with the Service Information.

4.INTERMITTENT TIRE PRESSURE SENSOR DTC







Does the DTC reset or is the status Active for this DTC?

Yes
  • Return to the beginning of this test and perform the diagnostic procedure as necessary.


No
  • Test complete.