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Old 09-06-2008, 12:14 PM   #1 (permalink)
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overhead trip computer problems

My overhead computer is not working, all the lights are on, and it will read the direction, ie N S E W, but I cant get any readings for MPG, DTE, etc..what might cause this and where would i start looking..
thanks for any input.
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Old 09-06-2008, 05:01 PM   #2 (permalink)
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My temp takes forever to get a "correct" reading. (It's been near 100* and my reading says 58*) From my understanding, there's a TSB to get the overhead back up to speed.
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Old 09-06-2008, 05:08 PM   #3 (permalink)
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Quote:
Originally Posted by GMCummins View Post
My overhead computer is not working, all the lights are on, and it will read the direction, ie N S E W, but I cant get any readings for MPG, DTE, etc..what might cause this and where would i start looking..
thanks for any input.
This is out of the 2001 service manual. It may help you find out whats up.

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:
Microprocessor RAM read/write test
Non-volatile memory read/write test
Microprocessor ROM verification test
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:
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.
If the “FAIL” message is displayed, the compass
mini-trip computer module is faulty and must be
replaced.
If the “CCd” message is displayed, the use of a
DRBt scan tool and the proper Diagnostic Procedures
manual are required for further diagnosis.
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.
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Old 09-06-2008, 09:57 PM   #4 (permalink)
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I just tried that self test and it wont work, my truck is an 05, so maybe its different..
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