LESSON 4: ELECTRICAL
TPMS Diagnosis
The TPMS system requires new procedures for diagnosis and tire service. This training course highlights the
procedures and service requirements in some detail, but is not intended to take the place of the Workshop Manual.
Refer to Section 204-04 in the Workshop Manual for full details.
NOTE: Tire sealing products render the TPMS sensor inoperative. Removing the sealer from the tire and wheel
assembly and replacing the contaminated sensor is the only way to repair this type of damage.
The first step in diagnosis is to verify the customer concern. Then, check the fuses and make a cursory inspection
to make sure:
•
The tire pressure is correct.
•
The tires are matched and of the proper size.
•
The TPMS sensors are installed on the vehicle.
If the inspection reveals an obvious concern, repair as required. If the concern remains after the inspection,
connect a diagnostic scan tool to the data link connector (DLC) and check for fault codes.
If a TPMS code is present, refer to the TPMS DTC chart for the code that applies. If no TPMS codes are present,
refer to the symptom chart in the Workshop Manual. The following list is a quick reference of the more detailed
chart in the Workshop Manual.
TPMS Diagnostic Trouble Codes
For reference, DTCs in the TPMS system are:
DTC
Description
B1342
ECU is defective
B2477
Module configuration failure/mismatch
B2849
Horn output relay circuit open
B2872
Tire pressure sensor fault
C2780
ECU in manufacturing mode
U0073
CAN bus off - Transmit Error
U1900
CAN communication bus fault receiver error
2004 Explorer/Mountaineer New Model Technician Training
12-AUG-03
4-10