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GM Enhanced (OBD II) Diagnostics
5
Select
View Data
from theGM Func-
tion List and press
.
GM arranges the PIDs in four groups:
❒
Analog:
viewing of analog sensor
signals, such as measured volt-
age from O2 sensors, tempera-
ture 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 dis-
play options. Use the
to
select an option and press
.
Refer to “
Viewing Data
” on page 3-9 to
setup the data list.
After making a selection, press
to establish a communication link. Mul-
tiple 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 STA-
TUS, it displays the PID and with the
computer module ID blinking in paren-
theses.
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.