System Check Unit Availability
90subaru01NUMBER 14-15-89
DATE 01-02-90
APPLICABILITY 1985 TO 1988 "L" SERIES, XT, AND JUSTY VEHICLES
SUBJECT: SYSTEM CHECK UNIT AVAILABILITY
A system check unit is a tool which will provide a means of detecting the source of intermittent fuel system problems. This is done by employing a memory function in an ECM for trouble codes as well as providing a communication function with the select monitor.
The check unit resembles the original control unit and replaces it during operation.
Accordingly, when the source of the problem is detected by using the check unit and subsequently corrected, the original control unit must be reinstalled.
Application for the check unit is detailed in the chart below. All part numbers given are available through normal parts channels.
Part number of check unit
A. 499357400
B. 499357000
C. 499357100
D. 499357300
E. 499357200
In addition:
Cartridge "C" (PART NUMBER: 498347200) is necessary to use the above check units with the select monitor.
Please refer to the select monitor manual regarding detailed select monitor usage.
An outline of check unit features is detailed below.
Check unit "A" (for 1986MY - SPFI)
Basic function is the same as with the control unit incorporated in production vehicle. Communication function between select monitor is added and memory condition (*) is modified.
*: Time delay between "ECS lamp on" to "memory" is set to almost zero (0).
Check unit "B" (for 1985 & 1986MY - MPFI & Turbo and 1987MY - XT)
(1) Addition of memory function for trouble code
(2) Increased number of diagnosis items
(3) Simplification of trouble code reading by two-tone colored LED
(4) Addition of communication function with select monitor
Check unit "C" (for 1887MY 4D.SW.3D - Turbo)
Basic function is the same with the control unit incorporated in production vehicle. Communication function between select monitor is added.
Check unit "D" (for 1987MY - EFC Justy)
(1) Addition of memory function for trouble code
(2) Increased number of diagnosis items
(3) Simplification of trouble code reading by two-tone colored LED
(4) Addition of communication function with select monitor
Check Unit "E" (for 1985 & 1986MY - ECC)
(1) Addition of memory function for trouble code
(2) Increased number of diagnosis items
(3) Simpiification of trouble code reading by two-tone colored LED
(4) Addition of communication function with select monitor
A detailed instruction manual for the system check unit is included with each check unit. These manuals are also available separately through normal parts channels under P/N MSA5T90447.