Honda Acura NSX 1991 Service Manual page 1128

Interlock System
-Control Unit Input Test
Disconnect the 8-P connector from the control unit.
Make the following input tests at the harness pins. If all
tests prove OK, yet the system still fails to work, substi-
tute the control unit with a known-good one. If the sys-
tem is OK, replace the control unit.
NOTE: If the shift lock solenoid clicks when the ig-
nition switch is ON and the brake pedal is pushed
(the shift lever is in the P position), the shift lock
tem is electronically normal. If the shift lever can-
not be shifted from P position, see page 23-l 56 and
section 14.
Shift Lock System:
No. Wire Test condition
Ignition switch ON.
Brake pedal pushed.
Ignition switch ON.
1
Step on the brake pedal
and the accelerator at
the same time.
Shift lever position in P. Check for continuity to ground:
2
Ignition switch ON.
3
Key Interlock System:
Wire Test condition
No.
Under all conditions.
1
BLK
Shift lever position in P. Check for continuity to ground:
2 GRNIWHT'
Ignition switch turned
to ACC and the key
3
pushed in.
Ignition switch turned
to ACC and the key
4
pushed in.
23-142
INTERLOCK CONTROL UNIT
sys-
Test: desired result
Check for voltage to ground:
should be battery voltage.
Check for voltage to ground:
should not be battery voltage.
should be continuity.
Check for voltage to ground:
should be battery voltage.
Test: desired result
Check for continuity to ground:
should be continuity.
should be continuity.
Check for voltage to ground:
should be battery voltage.
Check for voltage to ground:
should be battery voltage.
View from wire side
Possible cause (if result is not obtained)
Blown No. 45 (20 A) fuse.
l
Faulty brake light switch.
l
Faulty throttle angle sensor.
l
Faulty A/T control unit.
l
An open in the wire.
l
Faulty shit? position console switch.
l
Poor ground (G401, G402).
l
An open in the wire.
l
Blown No. 5 (IO A) fuse.
l
Faulty shift lock solenoid.
l
An open in the wire.
l
Possible cause (if result is not obtained)
Poor ground (G401, G4021.
l
An open in the wire.
l
Faulty shift position console switct
l
Poor ground (G401, G402).
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An open in the wire.
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Blown No. 45 (20 A) fuse.
l
Faulty steering lock assembly
l
(key interlock solenoid).
An open in the wire.
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Blown No. 45 (20 A) fuse.
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Faulty steering lock assembly
l
(key interlock solenoid).
An open in the wire.
l