BE/Body Electrical System, page 120

BE-120                    BODY ELECTRICAL SYSTEM — Trip Computer

TEST                                    TROUBLE

C                MPG indication always 70 miles/gal or trip reading does not change.

Does MPG always indicate 70
or trip reading not change?      Yes  ——————————> Replace DISPLAY CLUSTER.
                 |
                 No
                 |
                 v
①      Does voltage change from 0 to 5V between terminals r and GND of 14-terminal connector
       in accordance with fuel consumption?
                 |
                 No                                                     Yes
                 |                                                       |
                 v                                                       v
         Replace Keyboard.                                      Replace DISPLAY CLUSTER.

NOTE:  If tester indication can be verified, this check is okay.
Analog Type:  Needle fluctuation
Digital Type:  Number change


1
       14-terminal Connector of DISPLAY CLUSTER

       [DIAGRAM showing a 14-terminal connector with wires labeled 'r' and 'GND' connecting to a display cluster unit showing a digital readout and various controls]