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The CMTC/EVIC will display the variance zone
stored in memory and the word VARIANCE.
•
Use the RESET button to select the proper vari-
ance zone number, 1 through 15.
•
After selecting the proper zone number, momen-
tarily press and release the RESET button. The
variance zone is then stored in the memory and
the CMTC/EVIC returns to normal operation.
CT:
•
The ignition switch must be in the On position
and the C/T display must not be blank.
•
Press and hold the C/T and US/M buttons (ap-
proximately 5 seconds) until VARIANCE = XX is
displayed. The C/T will display the variance zone
stored in memory and the word VARIANCE.
•
Use the US/M button to select the proper vari-
ance zone number, 1 through 15.
•
After selecting the proper zone number, momen-
tarily press and release the C/T button. The
variance zone is then stored in the memory and
the C/T returns to normal operation..
3.14.4 COMPASS CALIBRATION
The compass module has 2 types of auto-
calibration; slow-cal and fast-cal. Slow-cal ensures
that during normal vehicle operation the compass
performs auto-calibration functions to keep the
compass sensors in their proper operating range.
Whenever the ignition is On and the CT/CMTC/
EVIC receives PCI bus data indicating that engine
RPM is greater than zero, auto-calibration is per-
formed continuously.
If the calibration information stored in the com-
pass module memory is not within the normal
range after a power-up cycle, the compass will
display CAL. The CT/CMTC/EVIC will enter into
the fast-cal mode until calibration is complete.
To enter the compass into Manual Calibration
mode, perform the following steps:
•
Drive the vehicle to an area away from any large
metal objects or overhead power lines.
•
Ensure that the proper variance zone is selected.
See Setting Magnetic Zone Variance.
GENERAL INFORMATION
•
The ignition switch must be in the On position
and the CMTC/EVIC display must not be blank.
•
Press the C/T button to view the Compass/
Temperature display.
•
Press and hold the RESET button (approximately
10 seconds) until CAL is displayed, then release
the button.
•
Drive slowly, less than 5 MPH (8KPH) in at least
1 complete 360-degree circle.
•
CAL will remain illuminated to alert the driver
that the compass is in the calibration mode.
•
After calibration is complete, CAL will turn off.
NOTE: For C/T Manual Calibration, perform
the same procedure as above, but press and
hold the C/T and US/M buttons until CAL is
displayed.
If the compass appears blank, unable to be cali-
brated, or the compass displays false indications,
the vehicle must be demagnetized. Refer to Com-
pass Demagnetizing Procedure in the Service Man-
ual.
3.14.5 SELF-CHECK DIAGNOSTICS
The CT/CMTC/EVIC is capable of performing a
diagnostic self check on its internal functions. Di-
agnostics may be performed using a DRBIII or by
using the following procedure:
1. For CMTC/EVIC: With the ignition switch in the
OFF position, depress and hold the RESET and
the STEP buttons.
For CT: With the ignition switch in the OFF
position, depress and hold the C/T and the US/M
buttons.
2. Turn the ignition switch to the ON position.
3. Continue to hold both buttons until the software
versions are displayed, then release the buttons.
4. All of the VFD segments will illuminate for 2-4
seconds. Check for segments that do not illumi-
nate or illuminate all the time.
5. When the self-check is complete the EVIC will
display one of the following messages:
•
PASS SELF TEST
•
FAILED SELF TEST
•
NOT RECEIVING J1850 MESSAGE
When the self-check is complete the CT/CMTC
will display one of the following messages:
•
PASS
•
FAIL
•
BUS
1. To exit the self-check mode:
29
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