Honda Civic Service Manual page 313

PGM-FI System
6 7 .
MIL Circuit Troubleshooting (cont'd)
Check for continuity between ECIM connector
t e r m i n a l A 2 0 a n d b o d y g r o u n d .
ECM CONNECTOR A (31P)
r l 2 l 3 1 4
5
o t /
9
10 t1 121,/ 1,/ 1516
ta,
9 2A 21
22 '3
241 125
26
n
o
Wire side of female terminals
ls there continuity?
YES Repair shon in the wire between the ECN4
{A20) and the TP sensor, or repair short in the wire
between the ECM (A8) and the knock sensor. t
NO Update the ECM if it does not have the latest
software. or substitute a known-good ECM, then
recheck (see page l1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
o r i g i n a l E C M . t
vcc2
{YEL/
BLU}
1 1 - 1 0 6
68. Measure voltage between body ground and ECM
c o n n e c t o r t e r m i n a l E 5 .
ECM CONNECTOR E (31PI
Is there about 5 V?
YES U pdate the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good EClvl, replace the
o r i g i n a l E C M . t
NO-Go to step 69.
Turn the ignition switch OFF.
Disconnect the fuel tank pressure (FTP) 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 ) .
6 9 .
7 0 .
1 1 .
Wire side of female terminals