Vehicle Speed Sensor (Vss) - Acura Integra 1998 Service Manual

The scan tool indicates Diagnostic Trouble Code (DTC) P0500r A low voltage problem in the Vehicle Speed
S e n s o r ( V S S ) c i r c u i t .
Intermittent failure, system is OK
at this time. Check for ooor con-
neciions or loose wires at C112
IVSSI and ECM.
ECM CONNECTORS
A (32P)
LGl
IBRN/8LK)
c (31Pt
vss
{ORN)
Wire side of female terminals
The MIL has been reported on.
DTC P0500 is stored.
Probleft veritication:
1 . T e s t d r i v e t h e c a r .
2 . C h e c k t h e v e h i c l e s p e e d w i t h
t h e s c a n t o o l ,
l s t h e c o r r e c t s p e e d i n d i c a t e d ?
Check lor an open in the ECM:
1 . T u r n t h e i g n i t i o n s w i t c h O F F .
2 . B l o c k t h e r e a r w h e e l s a n d s e t
t h e p a r k i n g b r a k e .
3 . J a c k u p t h e f r o n t o f t h e c a r a n d
suppon it with safety stands.
4 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
5 . B l o c k t h e r i g h t f r o n t w h e e l
a n d s l o w l y r o t a t e t h e l e f t f r o n t
6 . M e a s u r e v o l t a g e b e t w e e n
E C M c o n n e c t o r t e r m i n a l s C 1 8
a n d A 9 .
Substitute a known-good ECM
and recheck. H symptom/indica-
tion goes away, replace tho origi-
n a l E C M .
D o e s t h e v o l t a g e p u l s e 0 V
a n d 5 V o r b a t t e r y v o l t a g e ?
Check lor a shori in th€ ECM:
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec
t o r C ( 3 1 P ) .
3. Turn the ignition switch ON (lli.
4 . B l o c k t h e r i g h t f r o n t w h e e l
and slowly rotate the left front
5. Measure voltage between ECM
connector lerminals C18 and
A9.
Substitute a known-good ECM
and lecheck. lf symptom/indica-
tion goos away. rsplaco the origi-
n a l E C M .
D o e s t h e v o h a g e p u l s e 0 V
a n d 5 V o r b a t t e r y v o l t a g e ?
R e p a i r s h o r t i n t h e w i r e
b€tween ECM {C18} end VSS,
TCM, or cruise control unit.
R e p e i r o p e n i n t h e w i r e
between ECM (C18) aod VSS.
ff wire is OK, replace the VSS.
r a 1 7 1 8 1 9 2 0
t 6 ] t 1 3 r 1 9
LG1
{BRN/BLKI
vss
(ORNI
2 3 5
6
3 9 1 0 1 1
5
6
12 i 5
r 9
20
22 23 2a
1 1 1 2
1 3 1 / t
r6 t s / z t
25
26
2A
a9
,/
27
24
," ,/ ,,:
1 1 - 8 5