Subaru XT 1988 Service Manual page 1365

WIRING DIAGRAM AND TROUBLESHOOTING
§J
DISPLAY PRESENTATION
Display presentation Cause
~
System operates properly.
Lamp remains off.
Signal is not emitted from MPFI control unit.
~
Faulty car-speed sensor circuit.
~
Faulty steering sensor circuit.
~
Faulty temperature sensor circuit.
~
Faulty power steering fluid heater circuit.
Faulty pump motor drive circuit.
~
Faulty pump motor drive circuit.
Faulty signal control power line voltage.
Faulty power controller control
Example:
• All systems operate properly.
1 second Start pulse alone is emitted.
~
..... Waveform pattern is repeated.
1 second 1 second
• Faulty car-speed pulse circuit.
Car-speed sensor
circuit is N.G.
. .... Waveform pattern is repeated.
• Both car-speed pulse circuit and pump motor circuits are faulty .
Start
..... Waveform pattern is repeated.
pulse Car-speed sensor Pump motor circuit
circuit is N.G. is faulty.
93
6-3
Refer to
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B-ll
B-3
B-4
B-5
B-6
B-7
B-8
B-l0
B-9