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GM Enhanced (OBD II) Diagnostics
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5
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.
❒ 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
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 3-11
to setup the data list.
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.
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.
Press
FUNC
to return to the GM Function List.
Select Pid Group ?
`Analog
O2 [
Misfire ~
Validating PID Map
PID23of99
Please Wait
Select Data To View
` Entire Data List
Custom Data List
View Data Setup ~
MIL STATUS($10) ON
MIL STATUS($1A) OFF
ENGINE(RPM)($10) 256[
ENGINE(RPM)($1A) 261~
Module $1F is not
Responding. Continue
Without it?
Yes <No> ~