Actron 9640A manual View Data

GM Historic (OBD I) Diagnostics

A message confirming that the Erase
Codes command was successful dis-
plays. Press	to return to theGM
Function List.

Manual Erase Methods

Alternate Method 1:
1)	Turn Ignition Key Off.
2)	Locate Fuse Box and Remove ECM Fuse.
3)	Wait 20 seconds.
4)	Replace the Fuse.
Alternate Method 2:
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, th replace the

cable.
✓ The computer has a “learning” ability to comp nsate	n r variations
in engine operation. Whenever power is removed from the PCM, the c -
puter must “relearn” various functions. Vehicle pe	ormance may be

noticeably different until this is accomplished. This is a tempo ary situation
and is normal. The “learning” process takes place during warm engine
driving.	ENTER		CodesCommand			5
View Data		nt.Peform		READ
		CODES	Function	To
The View Data function allows the user toEraseVrifyview the vehicleEraseParameter.					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.

!	Neveroperate thetoolwhiledriving.Haveanotherperson
! WARNING	assist with the operation of the tool.
Select View Data from the GM Func-
tion List and press		. If a Select
	ENTER	`3ViewDataGMFunctinList2Erse1)RedCaoCodes [~

Group screen does not appear, skip the

Multiple Group section and continue.

Multiple Group Vehicles

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

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