GM Service Manual Online
For 1990-2009 cars only
ABS Reference Speed: Displays 0 to 255 km/h (0 to 159 mph). The vehicle speed from the average of all four wheel speeds.

Calibration ID: Displays the 4 digit calibration ID of the EBCM.

Check Tires: Displays Yes or No. The status of the TIM system. Indicates whether the tires should be checked for proper air pressure.

Ignition Voltage: Displays 0 to 17 Volts. The level of ignition voltage at the EBCM.

LF Wheel Speed: Displays 0 to 255 km/h (0 to 159 mph). The actual speed of the left front wheel.

LR Wheel Speed: Displays 0 to 255 km/h (0 to 159 mph). The actual speed of the left rear wheel.

PROM ID: Displays the 4 digit PROM ID of the EBCM.

RF Wheel Speed: Displays 0 to 255 km/h (0 to 159 mph). The actual speed of the right front wheel.

RR Wheel Speed: Displays 0 to 255 km/h (0 to 159 mph). The actual speed of the right rear wheel.

TIM Auto Learn Mode Active: Displays Yes or No. The auto learn mode status of the TIM system.

TIM Failed: Displays Yes or No. The failed status of the TIM system. Indicates if the EBCM disabled TIM due to a malfunction.

TIM Monitor Mode 1: Displays Yes or No. The monitor mode 1 status of the TIM system. The EBCM has limited detection capability for a low tire condition and has only partially learned the tire inflation configuration for the speed range.

TIM Monitor Mode 2: Displays Yes or No. The monitor mode 2 status of the TIM system. The EBCM has full detection capability for a low tire condition and has fully learned the tire inflation configuration for the speed range.