RAM 2500 Truck 2WD V10-8.0L VIN W MDC (1999)
Technical Service Bulletin # 08-51-98
Date: 981127
Compass/Trip Computer - Indicates False MPG
NO: 08-51-98
GROUP: Electrical
DATE: Nov. 27, 1998
SUBJECT:
Compass Mini Trip Computer
Indicates Erroneous Average
Miles Per Gallon, Distance To
Empty, And/Or Trip Odometer
THIS REPAIR IS COMPATIBLE WITH CHRYSLER'S MOBILE SERVICE PROGRAM AND DOES NOT REQUIRE HOISTS OR OTHER FULL
SERVICE FACILITY SPECIAL EQUIPMENT.
MODELS:
1999 (BR/BE) Ram Trucks
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE COMPASS MINI TRIP COMPUTER (SALES CODE CUS).
SYMPTOM/CONDITION:
The compass mini trip computer indicates inaccurate Average Miles Per Gallon and Distance To Empty when the compass mini trip computer is allowed
to calculate the average miles per gallon over an extended mileage period (approximately 1609 km (1000 miles)) without a reset.
The trip odometer and the elapsed time on the compass mini trip computer can display erroneous numbers in the third digit from the right. If the number
7 (seven) is displayed in the fourth digit from the right, the third digit will illuminate the lower horizontal bar segment. Example shown (Figure 1).
DIAGNOSIS:
The requirements to duplicate the first Symptom/Condition requires the vehicle to be driven for approximately 1609 km (1000 miles) without resetting
the Average Miles Per Gallon.
The requirements to duplicate the second Symptom/Condition requires that the trip odometer on the compass mini trip computer not be reset for a
minimum of 710.0 km/miles.
If the customer indicates that their compass mini trip computer indicates inaccurate Average Miles Per Gallon and/or inaccurate Distance To Empty, or
indicates that the trip odometer or the elapsed time feature on the compass mini trip computer displays the lower portion of the third segment when a 7
(seven) is displayed in the fourth digit, perform the Repair Procedure.
