2nd Gen Non-Engine/Transmission Ccd on overhead console

[MMonday]

What does this mean and how to get rid of it, its intermmitant and only shows up on avg.and dist. to empty

 

[RustyJC]

Here's what a Google search came up with on another forum, supposedly from the 2001 service manual:

SELF-DIAGNOSTIC TEST
A self-diagnostic test is used to determine that the
compass mini-trip computer module is operating
properly electrically. Initiate the self-diagnostic test
as follows:
(1) With the ignition switch in the Off position,
simultaneously depress and hold the Step button and
the U.S./Metric button.
(2) Turn the ignition switch to the On position.
(3) Continue to hold both buttons depressed until
the compass mini-trip computer module enters the
display segment test. In this test, all of the Vacuum
Fluorescent Display (VFD) segments are lighted
while the compass mini-trip computer module performs
the following checks:
² Microprocessor RAM read/write test
² Non-volatile memory read/write test
² Microprocessor ROM verification test
² CCD communications test.
(4) Following completion of these tests, the compass
mini-trip computer will display one of three
messages: “PASS,” “FAIL,” or “CCd.” Respond to the
respective test results as follows:
² If the “PASS” message is displayed, but compass
mini-trip computer operation is still improper, the
use of a DRB scan tool and the proper Diagnostic
Procedures manual are required for further diagnosis.
² If the “FAIL” message is displayed, the compass
mini-trip computer module is faulty and must be
replaced.
² If the “CCd” message is displayed, the use of a
DRBt scan tool and the proper Diagnostic Procedures
manual are required for further diagnosis.
² If any VFD segment should fail to light during
the display segment test, the compass mini-trip computer
module is faulty and must be replaced.
(5) If all tests are passed, or if the ignition switch
is turned to the Off position, the compass mini-trip
computer module will automatically return to normal
operation.


Rusty

 

[fest3er]

In short, it means it's having trouble connecting to the Chrysler Collision Detect bus. In this case, 'collision detect' means nodes on the bus detect when their transmitted messages collide with those of another node and try again after a random pause. (It's much like the ethernet CSMA-CD LAN: Carrier Sense, Multiple Access, Collision Detect.)

If I had to guess, I'd say it's a loose or slightly corroded connection.

 

[fest3er]

[Stupid Chrome browser.]