Malfunction In Knock Sensor Circuit - Honda Civic 2002-2003 Service Manual

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Ole P0325: Malfunction in Knock Sensor
Circuit
1. Reselthe ECM Isee page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load lin neutral) until the radiator fan comes on,
then let ',t idle.
3. Hold the engine at 3,000-4,000 rpm for at least
60 seconds.
Is 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 althe ECM .•
4. Turn the ignition switch OFF.
5. Disconnect the starter subharness 6P connector.
6. Check for continuity between ECM connector
terminal A9 and body ground.
ECM CONNECTOR A
131 Pl
Wire side of female terminals
Is there continuity?
YES-Repair short in the wire between the ECM
IA9) and the starter subharness 6P connector..
NO-Go to step 7.
7. Connect starter subharness 6P connector terminal
No.5 to body ground with a jumper wire.
STARTER SUBHARNESS
6P CONNECTOR
KS JUMPER
(RED/BlU) W)RE
=
Wire side of female terminals
8. Check for continuity between body ground and
ECM connector terminal AS.
ECM CONNECTOR A (3IP)
=
Wire side of female terminals
Is there continuity?
YES-Go to step 9.
NO-Repair open in the wire between the ECM lAS)
and the starter subharness 6P connector .•
9. Check the starter subharness between the 6P
connector and the knock sensor for an open or
short. If it's OK, substitute a known-good knock
sensor and recheck.
Is DTC P0325 indicated?
YES-Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck Isee page 11-6). If the symptom/indication
goes away with a known-good ECM, replace the
original ECM .•
NO-Replace the original knock sensor and/or
starter subharness .•
11-77