GM Service Manual Online
For 1990-2009 cars only
Fuel Enable: The scan tool displays Enable/Disable. The scan tool displays Enable when the PCM has received a valid fuel continue password from the VTD system.

GM Part Number: The scan tool displays the 8 Digit GM Part Number. The scan tool displays the part number of the control module .

His. DTC Cyc. Counts: The scan tool displays 0-255 counts. The scan tool displays the number of ignition cycles of the history DTC.

Key Read Status: The scan tool displays No Key Read/Illegitimate Key Code/Valid Key code/Invalid key Code. Display indicates the current state of the key transponder being read.

Lock Out-Timer: The scan tool displays 0-610 seconds. The scan tool displays the time remaining in the lock-out timer mode. The VTD system will disable sampling of the key code for 3 seconds since a tamper was detected.

Manufactures Enable Counter: The scan tool displays 0-255. The Manufactures Enable Counter is cleared prior to leaving the assembly plant. This data value is for use at the assembly plant only.

Passkey State: The scan tool displays Standby/Monitor Key Code/Bulb Test/Learn First key/Tamper/No Coded Key/Learn More Keys Standby/ALDL LMK Standby/ALDL Re-Learn Wait/ Re-Learn Wait/Re-Learn Pending Interaction/Re-Learn Interaction. The scan tool displays the current state of the of the VTD system.

PCM/VCM in VTD Fail Enable: The scan tool displays Yes/No. The scan tool displays Yes when the PCM is in fail enable. This indicates a failure occurred in the VTD system.

PROM ID: The scan tool displays the PROM ID. The scan tool displays the 4 digit internal PROM ID of the module.

Relearn Counter: The scan tool displays 0-255 counts. The scan tool displays the current state of the relearn counter, which must time out three consecutive times in order for the relearn procedure to be complete.

Relearn Timer: The scan tool displays 0-610 seconds. The scan tool displays the current state of the relearn timer, which must time out three times in order for the relearn procedure to be complete.

Reset Counter: The scan tool displays 0-10. The scan tool displays the current state of the reset counter.

Security Indicator Status: The scan tool displays On/Off. The scan tool displays the current state of the security indicator as commanded by the VTD system.

Valid Key Code Counter: The scan tool displays 1-10. The scan tool displays the number of transponder values learned by the VTD system.

VTD Fuel Disable: The scan tool displays Active/Inactive. The scan tool displays Active when the PCM has received a disable password from the VTD system.

VTD Fuel Disable Until Ign. Off: The scan tool displays Yes/No. The scan tool displays Yes when the PCM has received the fuel disable password from the VTD system. This indicates the PCM will not allow fuel delivery until the ignition is switched off prior to another start attempt.