Honda Prelude 1993 Service Manual page 1239

Control Unit Input Test
Oisconnect the 8-P connector from the interlock control
untr.
Inspect the connector and socket terminals to be sure
they are all making good contact.
a lJ the terminals are bent, loose, or corroded, repair
them as necessary, and recheck the system.
a lt the terminals look OK, make the following input
tests at the connector.
- lf a test indicates a Droblem, find and correct the
cause, then recheck the svstem.
- lf all the input tests prove OK. substitute a
known-good control unit and recheck the system.
lf the check is OK, the control unit must be faulty;
reDlace it.
NOTE: lf the shift lock solenoid clicks when the ignition
switch is turned ON and you step on the btake pedal
{with the shift lever in LLI), the shift lock system is elec-
tronically normal; if the shift lever cannot be shifted
from LBl, test the A/T gear position switch as desctibed
on page 23-148 and see section 14.
Shift Lock System:
No. Wile
Test condilion
K6y Int6 ock System:
No.
Wire Test condition
INTERLOCK CONTROL UNIT
View from wire side
Test: Dosired result
Possiblo cause if result is not obtained
T€st: Desired result
Possible cause it lesult is not obtained
WHT/GRN
1
WHTi GRN lgnition switch ON.
Brake pedal pushed.
Check for voltage to ground:
There should be battery
voltage.
Blown No. 41 (15 A) tuse.
Faulty ECM.
Faulty brake switch.
Faulty throttle position (TP, sensor.
An open in the wire.
lgnition switch ON,
brake pedsl and ac-
celerator pushed at the
s a m e t i m e .
Check for voltage to ground:
There should be less than bat-
tery voltage.
GRN/WHT' Shift lever in @.
Check for continuity to ground:
There should be continuity.
Faulty A/T gear position switch.
Poor ground (G4O'1. G4O2, G4O4).
An open in the wire.
G R N lgnition switch ON.
Check tor voltage to ground:
There should be battery
voltage.
Blown No. 1 3 {1 0 A) fuse.
Faulty shift lock solenoid.
An open in the wire.
1
BLK
Under all conditions.
Check for continuity to ground:
There should be continuity.
. P o o r g r o u n d { G 4 O 1 , G 4 0 2 , G 4 O 4 )
. An open in the wire.
GRN/WHT' Shift lever in E.
Check for continuity to ground:
There should be continuity.
Faulty A/T gear position switch.
Poor ground (G4O1 , G4O2, G4O4).
An open in the wire.
WHT/RED lgnition switch turned to
ACC (l) and the key
pushed all the way in.
Check for voltage to ground:
There should be battery
voltage.
B l o w n N o . 4 6 ( 1 o A ) f u s e .
Faulty steering lock assembly (key
interlock solenoid).
An open in the wire.
WHT/BLU
23-161