Actron 9640A Manuel D’Utilisation

A message confirming that the 

Codes command was successful dis-
plays. Press 

ENTER

 to return to theGM 

Function List.

1) Turn Ignition Key Off.
2) Locate Fuse Box and Remove ECM Fuse.
3) Wait 20 seconds.
4) Replace the Fuse.

1) Turn Ignition Key Off.
2) Remove Power from Scan Tool.
3) Disconnect Scan Tool from Vehicle.
4) Remove Negative (-) Battery Cable. Wait 30 seconds, then replace the 

cable.

✓

The computer has a “learning” ability to compensate for minor variations
in engine operation. Whenever power is removed from the PCM, the com-
puter must “relearn” various functions. Vehicle performance may be
noticeably different until this is accomplished. This is a temporary situation
and is normal. The “learning” process takes place during warm engine
driving.

The 

View Data function allows the user to view the vehicle Parameter Identi-

fication Data (PIDs) in real time. As the PCM monitors PIDs, they are simulta-
neously transmitted to the scan tool. The PIDs are continuously updated at the 
PCM’s rate.

In addition to reading codes, 

View Data is the most useful diagnostic function 

for isolating the cause of a vehicle operation problem. Viewing data is also used 
for observing sensor data and the ON/OFF state of switches, solenoids, and 
relays.

View Data can be performed with the ignition key On-Engine Off or Running.

Select 

View Data from the GM Func-

tion List and press 

ENTER

. If a Select 

Group screen does not appear, skip the 
Multiple Group section and continue.

Some vehicles display a Select Group 
screen for viewing data. In these cases, 
only one group of data can be viewed at 
a time.

Erase Codes Command

Sent. Perform READ

CODES Function To

Verify Erase.

GM Function List

|

1)Read Codes

2)Erase Codes 

[

` 3)View Data  

 ~

Select Group

|

Engine Group 1

Engine Group 2

` Engine Group 3   ~