Honda Acura NSX 1991 Service Manual page 948

Troubleshooting
From page 22-59
connector from the cooling fan
Check for continuity of BRN/BLK
wire between the cooling fan con-
t r o l u n i t a n d prey" s w i t c h .
Y E S
Does compressor clutch engage
Y E S
Substitute a known-good cooling
symptom/indication goes away.
replace the original control unit.
22-60
Repair open in the BRNIBLK wire
between the cooling fan control
unit and pressure switch.
NO
Repair open in the BLWBLK wire
between PGM-F&ECU and cooling
fan control unit.