Dtg P0325: Malfunction In Knock Sensor Circuit - Honda EP3 Service Manual

DTG P0325: Malfunction in Knock Sensor
Circu it
1 . R e s e t t h e E C M ( s e e p a g e 1 1 - 4 ) .
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle.
3. Hold the engine at 3,000-4,000 rpm for at least
60 seconds.
ls DTC P0325 indicated?
YES-Go to step 4.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the knock sensor and at the ECM.I
4. Turn the ignition switch OFF.
5. Disconnect the starter subharness 6P connector.
6. Check for continuity between ECM connector
terminal Ag and body ground.
ECM CONNECTOR A 131P)
Wire side of lemale terminals
ls there continuity?
YES-Repair short in the wire between the ECM
(A9) and the starter subharness 6P connector.l
NO Go to step 7.
7. Connect staner subharness 6P connector terminal
N o . 5 t o b o d y g r o u n d w i t h a j u m p e r w i r e .
8 .
STARTER SUAHARNESS
6P CONNECTOR
l 1 l 2 1 3 l
l , / l 5 l 6 l
._
K S
I J U M P E R
| R E D / B L U )
I W | R E
I
Wire side of female terminals
Check for continuity between body ground and
ECM connector terminal A9.
9 .
ECM CONNECTOR A {31PI
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 continuity?
YES-Go to step 9.
NO Repair open in the wire between the ECM (A9)
and the starter subharness 6P connector.l
Check the starter subharness between the 6P
connector and the knock sensor for an open or
short. lf it's OK, substitute a known-good knock
sensor and recheck.
ls DTC P0325 indicated?
YES Update the ECM if it does not have the latest
software. or substitute a known-good ECM, then
recheck {see page '11-6). lf the sym ptomlindication
goes away with a known good ECM, replace the
o r i g i n a l E C M . I
N O R e p l a c e t h e o r i g i n a l k n o c k s e n s o r a n d / o r
sta rte r subharness.l
11-77