Actron Professional Enhanced Scan Tool 9640A, User Manual

Page: 105 / 126

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Help & Troubleshooting
8
Check the following if an error message displays:
❒
Verify ignition key is ON — not in the
ACCESSORIES position.
❒
Make sure the Scan Tool cable is securely
connected to the vehicle’s DLC.
❒
Examine the DLC closely and check for
cracked or recessed pins, or for any sub-
stance that could prevent a good electrical
connection.
❒
Verify that the vehicle you are testing is an OBD II-compliant vehicle. Just
because it has the OBD II J1962 DLC does not mean the vehicle is OBD
II compliant. Inspect the vehicle’s VECI decal for a statement of OBD II
compliance.
❒
Test for continuity between the DLC wiring and the computer. In an
extreme case, there may be a broken wire.
❒
With the KOEO, check for blown fuses. The computer and DLC usually
use separate fuses. If the fuse for the computer is blown, data cannot be
transmitted. The fuses may be located on the fuse block in the passenger
compartment.
❒
Make sure the computer has a good ground. If the computer case is
grounded, then clean the connection and apply a conductive (dielectric)
grease to the mating surfaces.
❒
With the KOEO, verify the battery voltage is at least 8.0V; the minimum
voltage to power the computer.
❒
As a last resort, the computer may be defective. Refer to the vehicle ser-
vice manual to diagnose the computer.
BATTERY REPLACEMENT
The Scan Tool requires six (6) size-AAA alkaline batteries to operate without
vehicle power. When the batteries need to be replaced, the low-battery icon (

)
displays.
• Rechargeable batteries do not last as long alkaline types and are not rec-
ommended.
• Non-rechargeable Lithium (Li) batteries can be used. Though Lithium types
last longer than the alkaline types, they are more expensive.
Follow these steps to replace the batteries:
1) Place the Scan Tool with the
display facing down on a
non-abrasive surface.
2) Remove the battery cover
screw.
3) Slide the battery cover off.
4) Remove
discharged batteries
and properly discard.
5) Install new batteries — note
polarity.
6) Slide battery cover on.
7) Install screw —
do not over-
tighten.
COVER
SCREW