Dtc P0325: Knock Sensor Circuit Malfunction - Honda S2000 Service Manual

PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0325: Knock Sensor Circuit Malfunction
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,
t h e n l e t i t i d l e .
3. Hold the engine at 3,000 4,000 rpmfor'10 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. From under neath the vehicle, reach above the
front of the starter motor, and disconnect the knock
s e n s o r 1 P c o n n e c t o r .
6. Disconnect ECM connector C (31P), then check for
continuity between ECI\4 connector terminals C22
and body ground.
ECM CONNECTOR C 131P}
ls there continuity?
YES Repair short in the wire between ECI\4 (C22)
and the knock sensor.l
NO Go to step 7.
Wire side ol lemale terminals
11-70
8 .
7. Connect knock sensor connector terminal No. 1to
body ground with a jumper wire.
KNOCK SENSOR 1P CONNECTOR
KS (RED/BLU)
JUMPER WIRE
Wire side of female terminals
Check for continuity between ECM connector
terminal C22 and body ground.
ECM CONNECTOR C {31PI
Is there continuity ?
YES Go to step 9.
NO Repair open in the wire between the ECM
( C 2 2 ) a n d t h e k n o c k s e n s o r . l
9. Substitute a known-good knock sensor and recheck.
ls DTC P0325 indicated?
YES-Substitute a known-good ECM and recheck
(see page 11-5). lf symptom/indication goes away,
r e p l a c e t h e 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 . I
wire side of temale terminals