GM Enhanced (OBD II) Diagnostics
GM arranges the PIDs in four groups:
❒Analog: viewing of analog sensor signals, such as measured voltage from O2 sensors, temperature sensors, and air flow sensors.
Select Pid Group | ? |
` Analog |
|
O2 | [ |
Misfire | ~ |
❒O2: viewing oxygen sensor information.
❒Misfire: viewing of cylinder misfire information.
❒Digital: viewing of switches, solenoids and relays.
✓Some GM trucks manufactured in 1996 – 1998 have only one PID group. For these vehicles, the selection menu does not appear.
After selecting a group, the scan tool
asks the vehicle to provide the PIDs it Validating PID Map supports for that group.
The scan tool displays a menu with display options. Use the UP/DOWN to select an option and press ENTER. Refer to “Viewing Data” on page
5
PID 23 of 99
Please Wait
Select Data To View
`Entire Data List Custom Data List View Data Setup ~
After making a selection, press ENTER to establish a communication link. Multiple PIDs may be sent if the vehicle is equipped with more than one computer module — Powertrain Control Module (PCM), Transmission Control Module (TCM), etc. The scan tool identifies them by their identification names (ID) assigned by the manufacturer (i.e. $40 or $1F).
If the Scan Tool receives multiple responses for a PID, such as MIL STATUS, it displays the PID and with the computer module ID blinking in parentheses.
MIL STATUS($10) | ON |
MIL STATUS($1A) | OFF |
ENGINE(RPM)($10) | 256[ |
ENGINE(RPM)($1A) | 261~ |
If one or more modules stops responding, the scan tool displays a message that the module is not responding and asks to continue without it. If No is selected, the Scan Tool attempts to reestablish communication with that module.
If one or more control modules stops responding, the tool will display a message that it is not responding. If you choose to continue, dashes will replace the module ID.
Module $1F is not Responding. Continue Without it?
Yes
Press FUNC to return to the GM Function List.
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