Honda Civic Service Manual page 1618

Interlock System
Control Unit Input Test
1. Disconnect the 8P connector from the interlock con-
trol unit.
2 . I n s p e c t t h e c o n n e c t o r a n d s o c k e t t e r m i n a l s t o b e
sure they are all making good contact.
.
lf the terminals are bent, loose or corroded, repair
them as necessary, and recheck the system.
.
l f t h e t e r m i n a l s l o o k O K , m a k e t h e f o l l o w i n g
input tests at the connector.
-
lf a test indicates a problem, find and correct
the cause, then recheck the system.
-
l f a l l t h e i n p u t t e s t s p r o v e O K , s u b s t i t u t e a
known-good control unit, and recheck the sys-
tem. lf the check is OK, the control unit must
be faulty; replace it.
N O T E : l f t h e s h i f t l o c k s o l e n o i d c l i c k s w h e n t h e
ignition switch is turned ON {ll) and you step on the
brake pedal (with the shift lever in E), the shift lock
system is electronically normal; if the shift leve.
cannot be shifted from E], test the Aff gear position
switch, park pin switch, and see section 14.
Key Interlock System:
Cavity Wire Test condition
Reconnect the 8P connector to the interlock control unit.
Shift Lock System:
Cavity Wifs Test condition
INTERLOCK
CONTROL UNIT
Test: Desired result
Test: Dgsired result
Wire side of
female terminals
Possible cause if result is not obtained
Possible cause if result is not obtained
WHT/BLU
lgnition switch turned to
ACC (lland key pushed in
C h e c k f o r v o l t a g e t o g r o u n d i
T h e r e s h o u l d b e b a f t e r y v o l t a g e .
Blown No. 48 (30 A) fuse in the under
hood fuse/relay box
Blown No. 33 (7.5 A) fuse in the under
dash fuse/relay box
Faulty steering lock assembly
lkey interlock solenoid)
An open in the wire
5 WHT
BLK
Under all conditions
Check for continuity to ground:
There should be continuity.
' Poor ground (G401, G402)
. An open in the wire
6 BLK./BLU
Shift lever in El
Check for continu;ty to ground:
There should be continuity.
Poor ground (G401, G402)
Faulty Ay'T gear position switch
An open in the wire
2 Y E L
l g n i t i o n s w i t c h O N l l l )
C h e c k f o r v o l t a g e t o g r o u n d :
T h e r e s h o u l d b e b a n e r y v o l t a g e .
. Blown No. 25 (7.5 A) fuse in the under,
dash fuse/relay box
. An open in the wire
3 YEUBLK
lgnition swirch ON (ll)
Check for voltage to ground:
There should be baftery voltage.
Blown No. 25 (7.5 A) fuse in the under-
dash fuse/relay box
Faulty shift lock solenoid
An open in the wire
6 BLI(BLU
Shift lever in I
Check for voltage to ground:
There should be 1 V or less.
Poor ground (G401, G402)
Faulty A,/T gear position switch
An open in the wire
7 WHT/RED
l g n i t i o n s w i t c h O N l l l )
B r a k e p e d a l d e p r e s s e d
Check for voltage to ground:
There should be 1 V or less.
Blown No. 52 (15 A) Iuse in the under
hood fuse/relay box
Faulty PCM
Faulty brake switch (see section 1l)
Faulty throttle position {TP) sensor
(see section 1'l )
An open in the wire
lgnition switch ON (ll)
B r a k e p e d a l a n d
accelerator depressed at
the same time
Check for voltage to ground:
There sho(Jld be battery voltage.
23-146