Innova 3120d, Owner'S Manual, Page: 35 / 131

Using the Diagnostic Tool
CODE RETRIEVAL PROCEDURE
3120d 33
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. This information is found in the vehicle's
service manual. Always refer to the vehicle's service manual
for detailed testing instructions.
Check your vehicle thoroughly before performing
any test. See BEFORE YOU BEGIN on page 31 for
details.
ALWAYS observe safety precautions whenever working on a
vehicle. See SAFETY PRECAUTIONS on page 3 for more
information.
1. Turn the ignition off.
2. Locate the vehicle's 16-pin Data Link
Connector (DLC). See page 5 for
connector location.
Some DLCs have a plastic cover
that must be removed before
connecting the Diagnostic Tool
cable connector.
If the Diagnostic Tool is ON, turn it
OFF by pressing the POWER/LINK
button BEFORE connecting
the Diagnostic Tool to the DLC.
3. Connect the Diagnostic Tool cable connector to the vehicle’s DLC.
The cable connector is keyed and will only fit one way.
„
If you have problems connecting the cable connector to the DLC,
rotate the connector 180° and try again.
„ If you still have problems, check the DLC on the vehicle and on
the Diagnostic Tool. Refer to your vehicle’s service manual to
properly check the vehicle’s DLC.
4. Turn the ignition on. DO NOT start the engine.
5. When the Diagnostic Tool’s cable connector is properly connected
to the vehicle’s DLC, the unit automatically turns ON.
„ If the unit does not power on automatically when connected to
the vehicle’s DLC connector, it usually indicates there is no
power present at the vehicle’s DLC connector. Check your fuse
panel and replace any burned-out fuses.