3.5
COMPASS MINI-TRIP COMPUTER
(CMTC)
This system, located in the overhead console,
displays information on outside temperature, com-
pass direction and trip information.
Compass and Temperature Display
This display provides the outside temperature
and one of eight compass readings to indicate the
direction the vehicle is facing.
Trip Odometer (ODO)
Shows the distance traveled since the last reset.
Average Fuel Economy (AVE ECO)
Shows the average fuel economy in MPG (miles
per gallon) or L/100Km since the last reset.
Instant Fuel Economy
Shows the fuel economy for the last few seconds
in MPG or L/100Km.
Distance to Empty (DTE)
Shows the estimated distance that can be trav-
eled with the fuel remaining in the tank. This is
calibrated using the MPG for the last few min-
utes.
Elapsed Time (ET)
Shows the accumulated ignition on time since the
last reset.
Step Button
Press this button to cycle through all the mini-
trip computer displays.
US/M Button
Press this button to convert all vehicle displays
from US to Metric to US.
To Reset the Display
Press the Step and US/M buttons simultaneously
for at least two seconds and all resettable condi-
tions will be reset. This will occur only if a
resettable function (AVG ECO, ECO, ET) is cur-
rently being displayed.
Automatic Compass Calibration
This compass is self calibrating which eliminates
the need to manually set the compass. When the
vehicle is new, the compass may appear erratic
and the CAL symbol will be displayed. After
completing three 360’ turns in an area free from
large metal or metallic objects, the CAL symbol
will turn off and the compass will function nor-
mally.
Compass Variance
Compass Variance is the difference between Mag-
netic North and Geographic North. In some areas
of the country, the difference between Magnetic
and Geographic North is great enough to cause
the compass to give false readings. If this occurs,
the compass variance must be set.
To set the variance: Turn the ignition ON and set
display to Comp./Temp. While pressing the US/M
button, press the STEP button for approximately
five seconds. The “VAR” symbol will light and the
last variance zone number will be displayed. Press
the US/Metric Button to select the proper variance
zone as shown on the map. Press the Step button to
set the new variance zone and resume normal
operation.
3.6
ELECTRO/MECHANICAL INSTRUMENT
CLUSTER (EMIC)
The Instrument Cluster contains a Fuel, Voltme-
ter, Coolant Temp, and Oil Pressure gauge, a Ta-
chometer and a Speedometer. With the exception of
the Voltmeter, the cluster positions the gauges with
PCI Bus messages received from the PCM. The
Voltmeter operates directly off of the Fused B+
Switched Ignition Output circuit that supplies igni-
tion voltage for the cluster.
The Instrument Cluster also contains warning
indicators that are illuminated by hard wired in-
puts or by messages received from other modules on
the PCI Bus.
The Trip/Total Odometer is a Vacuum Fluores-
cent Display (VF) that is controlled by PCI Bus
messages received from the PCM.
The cluster illumination lamps are hard wired in
the Instrument Cluster. When the Park or Head-
lamps are turned on, the cluster receives a dimmed
battery feed from the Headlamp Switch. The cluster
I/O Processor controls the VF display dimming and
also sends dimming level messages on the PCI Bus.
The EMIC will communicate with the DRBIII
t to
display PCI Engine Info, PCI Bus Info, and certain
input/outputs. Cluster diagnostic capabilities that
the DRBIII
t will actuate are limited to the Cluster
Calibration Points for the gauges. The DRBIII
t can
also extract active and stored Diagnostic Trouble
Codes (DTC) from the Instrument Cluster.
The EMIC is also capable of performing a diag-
nostic Self-Test that is actuated by depressing and
holding the Odometer trip reset stalk while cycling
the ignition from the off to the on position. After the
cluster Odometer displays CHEC, releasing the
reset stalk begins the test. The cluster will then
position all of the gauges at specified calibration
points and will illuminate all the PCI Bus con-
trolled indicators. The cluster will also illuminate
each segment of the VF display.
The EMIC can verify communications with the
PCM, ID the module, or change the country code
using the DRBIII
t. For further information regard-
ing the diagnostic routine and an explanation of the
faults, refer to the appropriate Service Manual.
5
GENERAL INFORMATION