Honda Civic Service Manual page 342

15. Check for continuity between body ground and
ECIM connector terminal 813.
ECM CONNECTOR B I24P}
Wire side of female terminals
ls there continuity?
YES Repair short in the wire between the ECM
( 8 1 3 ) a n d t h e a l t e r n a t o r . l
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck lsee page 1 1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
o r i g i n a l E C M . I
Electrical Power Steering (EPSI
Signal Circuit Troubleshooting
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 ) .
l\4easure voltage between ECM connector
t e r m i n a l s 4 2 4 a n d E 1 6 .
1 .
2 .
3 .
4 .
5 .
Wire side of female terminals
ls there battery voltage?
YES Go to step 6.
NO Go to step 3.
Start the engine.
Turn the steering wheel lo the full lock position.
l\4easure voltage between ECM connector
t e r m i n a l s A 2 4 a n d E 1 6 .
ls there momentaty battery voltage?
Y E S T h e E P S s i g n a l i s O K . t
N O G o t o s t e p 1 0 .
6 . T u r n t h e i g n i t i o n s w i t c h O F F .
7. Disconnect the EPS control unit 20P connector.
8 . 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 ) .
(cont'd)
1 1 - 1 3 5