Initial Inspection and Diagnostic Overview

Inspection and Verification

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.
1 Verify the customer complaint. As much information as possible should be gathered from the driver to assist in diagnosing the cause(s). Confirm which of the following two warning types exist for the TPMS
- Check tire pressure warnings. A low tire pressure warning will continuously illuminate the low tire pressure warning lamp. This warning will generate a text message CHECK TIRE PRESSURE. No Diagnostic Trouble Codes (DTCs) are generated with this type of warning.

NOTE:
Tire pressure adjustments are part of routine owner maintenance. Tire pressure adjustments that are required due to a lack of owner maintenance are not to be claimed under vehicle warranty. To extinguish this warning it is essential that, with the ignition 'ON', all vehicle tires are to be set to the correct pressure as stated in the vehicle handbook or as indicated on the placard label in the passenger/driver door aperture
System fault warnings. When a system fault is detected, the low tire pressure warning lamp will flash for approximately 75 seconds prior to being continuously illuminated. This indicates the presence of a system fault.
2 Visually inspect for obvious signs of damage and system integrity.





3 If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4 If the cause is not visually evident check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.
5 If the tester fails to communicate with the TPMS module, it is recommended that the TPMS power supply fuse is removed from the Rear Junction Box (RJB) for approximately 10 seconds and re-installed.

Drive Cycle
The vehicle must remain stationary for 15 minutes. Carry out a road test, for a minimum of 15 minutes at a speed greater than 12.5 mph (20 kph) for at least 75% of the road test.