Honda Civic Service Manual page 311

PGM-FI System
MIL Circuit Troubleshooting (cont'dl
51. Measure voltage between body ground and ECM
connector terminals 44, A5, 423, and 424
i n d i v i d u a l l v .
ECM CONNECTOR A 131P)
PG2 (BLK)
PG1 IBLKI
W i r e s i d e o f f e m a l e t e r m i n a l s
ls there morc than 1.0 V ?
YES Go to step 52.
N O - R e p a i r o p e n i n t h e w i r e ( s ) t h a t h a d m o r e t h a n
1.0 V between G 10'l and the ECM (A4, A5, A23,
A24l.a
Measure voltage between body ground and ECM
c o n n e c t o r t e r m i n a l 4 2 1 .
ECM CONNECTOR A 131P)
Wire side of female terminals
ls there about 5 V?
YES-Go to step 60.
N O - G o t o s t e p 5 3 .
1 1 - 1 0 4
53.
54.
Turn the ignition switch OFF.
Disconnect the manifold absolute pressure (MAP)
sensor 3P connector.
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 ) .
Measure voltage between body ground and ECM
c o n n e c t o r t e r m i n a l A 2 1 .
ECM CONNECTOR A {31P)
Wire side of female terminals
ls there about 5 V?
YES Replace the MAP sensor.l
NO Go to step 57.
Turn the ignition switch OFF.
D i s c o n n e c t E C M c o n n e c t o r A ( 3 1 P ) .
55.
56.
\
5 7 .
5 8 .