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GM OBD1 Systems
CODE RETRIEVAL PROCEDURE
47
Retrieving and using Diagnostic Trouble Codes (DTCs) for
troubleshooting vehicle operation is only one part of an
overall diagnostic strategy.
CODE RETRIEVAL PROCEDURE
Never replace a part based only on the DTC definition.
Each DTC has a set of testing procedures, instructions
and flow charts that must be followed to confirm the
location of the problem. Always refer to the vehicle's
service manual for detailed testing instructions.
Check your vehicle thoroughly before performing
any test.
ALWAYS observe safety precautions whenever working on a
vehicle.
1. Locate the vehicle's Data Link Connector (DLC).
Some DLCs have a plastic cover that must be removed before
connecting the Scan Tool's cable connector.
2. Connect the Scan Tool (with the GM
Connector Cable Adaptor attached) to
the vehicle’s DLC. Press POWER/LINK
to turn the Scan Tool ON, then
press ENTER
to continue.
An “instructional” message shows
on the Scan Tool’s display.
3. Turn the ignition ON. Turn all vehicle
accessories OFF. Select Continue,
then press ENTER
.
The Select Vehicle Year screen
displays.
- Highlight the desired year, then press ENTER
; the Enter
8th VIN menu displays.
4. Highlight the 8th digit of the vehicle’s VIN, then press ENTER
.
If the “Enter 4th VIN Digit” screen displays (not applicable to all
vehicles), highlight the 4th digit of the vehicle’s VIN, then press
ENTER
.
If the “Truck” screen displays (not applicable to all vehicles),
highlight Yes or No, as appropriate, then press ENTER
.
5. When the Scan Tool is in the process of retrieving codes, a "One
moment please..." message shows.
If the Scan Tool fails to link to the vehicle's computer, a "Vehicle
is not responding" message shows.
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