Honda Civic Service Manual page 338

DTC Pl519: IAC Valve Circuit Malf unction
1 . R e s e t t h e E C M ( s e e p a g e 1 1 - 4 ) .
2. Turn the ignition switch ON (ll)
ls DTC P 1519 indicated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the IAC valve and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnect the IAC valve 3P connector.
5. Turn the ignition switch ON (ll).
6. Measure voltage betlveen IAC valve 3P connector
terminal No. 2 and body ground.
IAC VALVE 3P CONNECTOR
IGP {YEL/BLK)
Wire side of female terminals
ls there battery voltage?
YES Go to step 7.
NO-Repair open in the wire between the IAC valve
a n d t h e P G M - F l m a i n r e l a y 1 . 1
Turn the ignition switch OFF.
1
2
3
7 .
8, Check for continuity between body ground and IAC
v a l v e 3 P c o n n e c t o r t e r m i n a l N o . 1 .
IAC VALVE 3P CONNECTOR
1
2
3
PG1 {BLK}
a.
Wire side of lemale terminals
Is there continuity?
Y E S - G o t o s t e p 9 .
NO Repair open in the wire between the IAC valve
a n d G ' 1 0 1 . 1
Disconnect ECM connector A (31P)
Check for continuity between body ground and
E C M c o n n e c t o r t e r m i n a l A 1 2 .
ECM CONNECTOR A 131P)
r l 2 l 3 l 4 5
6 1 7
s
r0
1l
12 ./
/ 115
6 ./11819
2C21
da
25126
l27ln
2930
IACV {BLK/RED}
1,)
Wire side oJ Jemale terminals
ls there continuity?
YES-Repair short in the wire between the IAC
v a l v e a n d t h e E C M ( A 1 2 ) . 1
N O G o t o s t e p 1 1 .
9 .
1 0 .
L C O n I O l
1 1 - 1 3 1