Subaru XT 1988 Service Manual page 323

2-7
FUEL INJECTION SYSTEM
How to Read Trouble Codes (Flashing)
The O
2
monitor lamp flashes the code corresponding to the
faulty part.
The long segment (1.2 sec on) indicates a "ten", and the short
segment (0.2 sec on) signifies a "one".
Example:
When only one part has failed:
Flashing code 12
(unit: second)
When two or more parts have failed:
Fig. 52
Flashing codes 12 and 21
(unit: second)
_ I I - I I
l
O.2-t11 \ ~0.2J
1.2ffn1.8
0.3 0.3
_II _ _ I _ I I
L~~~~:L2~L~,.J
0.3 0.3 0.3 0.3 0.2
36
L2-848