Honda S2000 Service Manual page 304

PGM-FI System
DTC Troubleshooting (cont'dl
12. Turn the ignition switch OFF.
13. Reconnect the VSS 3P connector.
1 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 ) .
1 5 . R a i s e t h e r e a r o f t h e v e h i c l e , a n d m a k e s u r e i t ' s
securely supported. Hold one wheel, and slowly
rotate the other.
'16.
lvleasure voltage between ECM connector
t e r m i n a l s A 9 a n d 8 2 0 .
ECM CONNECTORS
Wire side of female terminals
Does voltage pulse between 0 V and about 5 V?
YES Substitute a known-good ECM and recheck
(see page 11-5). lf the symptom/indicarion goes
away, replace the original ECM. t
NO Go to step 17.
1 7 . T u r n t h e i g n i t i o n s w i t c h O F F .
18. Disconnect ECM connector A (32P).
' 1 9 .
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 ) .
20. Hold one wheel, and slowly rotate the other.
B l25Pl
11-76
21. Measure voltage between ECM connector
terminals A9 and B20.
ECM CONNECTORS
Wire side of female terminals
Does voltage pulse between 0 V and about 5 V?
YES Substitute a known-good ECM and recheck
(see page 1 1-5). lf the symptom/indication goes
a w a y , r e p l a c e t h e o r i g i n a l E C M . I
NO Repair short or open in the wire between the
VSS and the ECM, if the wire is OK, replace the VSS
{see page 22-52). !
B (25P)