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Chatter

Chatter
If your vehicle chatters then check this value on.

To determine if your vehicle chatters perform the following steps:

  1. With the ignition turned off, connect the ALDL cable.
  2. Click on the "Automatically detect chatter" toolbar icon: .
  3. Turn on the ignition, but do not start the engine.

If your vehicle does NOT chatter you will see something similar to the following:

15:15.137: Check vehicle interface...
15:15.387: Requesting Max232 interface to acknowledge: $F0,$56,$00,$BA...
15:15.397: Max232 interface detected OK

15:15.399: Scanning for heartbeat and chatter frames...
15:15.660: Com timeout: Expecting frame header byte
15:15.660: No chatter found

If your vehicle DOES  chatter you will see something similar to the following:

59:52.067: Check vehicle interface...
59:52.317: Requesting Max232 interface to acknowledge: $F0,$56,$00,$BA...
59:52.327: Max232 interface detected OK

59:52.328: Scanning for heartbeat and chatter frames...
59:53.304: Heartbeat frame:
59:53.304: 59:52.849: $08,$55,$A3
59:53.304: Heartbeat frame is followed by 131ms of silence
59:53.304: Advisable value for T6 is 65ms

59:53.304: Chatter frame(s):
59:53.305: 59:52.980: $40,$58,$06,$A2,$04,$BC
59:53.305: 59:53.003: $41,$63,$00,$00,$00,$42,$19,$00,$00,$40,$DB,$1F,$00,$00,$00,$00,$C7
59:53.305: 59:53.014: $A8,$55,$03
59:53.305: 59:53.014: $A9,$57,$00,$00,$00
59:53.305: 59:53.031: $20,$55,$8B
59:53.305: 59:53.037: $21,$58,$BC,$1F,$46,$66
59:53.305: 59:53.047: $D8,$55,$D3
59:53.305: 59:53.067: $90,$55,$1B
59:53.305: 59:53.073: $91,$58,$00,$00,$00,$17
59:53.305: 59:53.085: $A0,$55,$0B
59:53.305: 59:53.085: $A1,$57,$08,$00,$00
59:53.305: 59:53.107: $11,$5C,$FF,$00,$4C,$00,$00,$00,$00,$48
59:53.305: 59:53.118: $40,$58,$06,$A2,$04,$BC
59:53.305: 59:53.141: $41,$63,$00,$00,$00,$42,$19,$00,$00,$40,$DB,$1F,$00,$00,$00,$00,$C7

The frames are prefixed by two timestamps, the left-most timestamp is the time the frame data was written to the console. The right-most timestamp is the frame's timestamp.

Heartbeat
Enter the heartbeat frame here.

Sometimes the heartbeat frame can be different depending on whther  the ignition is on or off. In this case only enter as many bytes as are common between the different heartbeats, usually 2 bytes.

The appropriate heartbeat should be displayed during chatter analysis. (See previous section: Chatter). If the chatter analysis cannot determine an appropriate heartbeat thenyou will need to select one maually.

Suspend
Enter the suspend chatter command frame here.

The suspend chatter command frame will be $ID,$56,$08,$CS where $ID is the body control module's ID and $CS is the appropriate checksum. You can invoke the frame editor by clicking on the ellipses button to the right of this field.

Suspend Reply
Tick this box if a reply is expected from the suspend command .

Resume
Enter the resume chatter command frame here.

The suspend chatter command frame will be $ID,$56,$09,$CS where $ID is the body control module's ID and $CS is the appropriate checksum. You can invoke the frame editor by clicking on the ellipses button to the right of this field.

Resume Reply
Tick this box if a reply is expected from the resume command .


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