Computer, Functional Testing; Computer Coding, Average Speed Display, Average Fuel Consumption Display, Checking
Computer, functional testing
Note
It is possible to check the condition of the various components of the computer by selecting the individual functions in the specified sequence.
If defective components are found, check wiring using the current flow diagram.
Always perform complete test procedure for functional testing.
Check these first:
Fuses S12, S4 OK
Time Display, Checking:
Time display, checking
- switch ignition ON
- push time display button (2)
Time Display, Checking:
^ display, time of day
If time is displayed, - check coding
If time is not displayed, - check function selector switch
- repeat test
If time is not displayed, - check computer in instrument cluster
- repeat test
Time Display, Checking:
Computer coding, checking
- switch ignition OFF
- press reset button and hold
- switch ignition ON (continue pressing reset button)
Display:
- see display (illustration)
^ coding is displayed
- check average speed display mph
If coding is not displayed, or is displayed incorrectly:
- check computer and/or install correct computer module
Country Code, Checking:
Country Code, checking
- switch ignition OFF
- push reset button and hold
- switch ignition ON
- release reset button
- push time display button (2) and hold
Display:
- see display (illustration)
^ coding displayed US - for USA CA - for Canada
If coding not displayed or wrong code is displayed
- replace computer module
Average Speed Display (MPH), Checking:
Average speed display (MPH) Checking (Hall sender for speedometer)
- switch ignition ON
- select mph function with function selector switch (1)
- press reset button for 5 seconds (while driving vehicle)
Display:
- see display
If instantaneous speed is displayed:
- check average fuel consumption display (mpg)
If instantaneous speed is not displayed:
- check function selector switch
^ speed must be displayed on speedometer
If speed is indicated, - check Hall sender for speedometer
If speed is not indicated, - replace speedometer or speedometer cable
Average Fuel Consumption Display (MPG), Checking:
Average fuel consumption display (mpg), checking
(Hall sender for speedometer and sender for fuel consumption display)
- switch ignition ON
- select function (mpg) with function selection button
- press reset button for 5 seconds (while driving)
Display:
- see display (average fuel consumption)
If OK, - check range display (Mi)