Honda Civic Service Manual page 312

59. Check for continuitv between ECIM connector
t e r m i n a l 4 2 1 a n d b o d y g r o u n d .
ECM CONNECTOR A {3,IPI
Wire side of female terminals
ls there continuity?
YES*Repair short in the wire between the ECM
( 4 2 1 ) a n d t h e M A P s e n s o r . l
NO Update the ECM it it does not have the latest
soflware, or substitute a known-good ECM, then
recheck (see page 1'l-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
Measure voltage between body ground and ECM
connector terminal 420.
ECM CONNECTOR A {3TP}
6 0 .
1 1 2 1 3 4 5
o t /
I
1 0
11112
5
6
/ 118 9 2t 21
2' 231?4
? q
Tln
29
vcc2
IYEL/
BLU)
W i r e s i d e o t f e m a l e t e r m i n a l s
ls there about 5 V?
YES-Go to step 68.
N O - G o t o s t e p 6 1 .
t t ,
o z ,
6 3 .
64.
Turn the ignition switch OFF.
Disconnect the throttle position (TP) 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
connector terminal 420,
ECM CONNECTOR A 131P)
Wire side of female terminals
ls there about 5 V?
YES Replace the thronle body (the TP sensor is
not available separately). I
NO Go to step 65.
Turn the ignition switch oFF.
Disconnect ECM connector A (31P).
65.
66.
c o n l o
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