Isuzu 1999 RODEO Workshop Manual page 1512

Diagnostic Trouble Code (DTC) P0327 KS Sensor Circuit
Circuit Description
The powertrain control module (PCM) uses the knock
sensor to detect engine detonation, allowing the PCM to
retard ignition control (IC) spark timing based on the
knock sensor (KS) signal being received. The knock
sensor produces an AC signal so that under a no knock
condition the signal on the KS circuit measures about
0.007 V AC. The signal amplitude and frequency are
dependent upon the amount of knock being experienced.
The PCM monitors the KS signal and can diagnose the
KS sensor and circuitry.
Conditions for Setting the DTC
f Engine running time is at least 10 seconds.
f The TP sensor is greater than 5%.
f The ECT sensor is greater than 60°C (140°F).
f Engine speed is between 2000 and 4000 RPM.
f The knock sensor signal voltage is less than 0.20 volts,
or greater than 4.8 volts.
f All conditions are present for more than 15 seconds.
Action Taken When the DTC Sets
f The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
f The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
f The PCM will use a calculated spark retard value to
minimize knock during conditions when knock is likely
to occur. The calculated value will vary based on
engine speed and load.
Conditions for Clearing the MIL/DTC
f The PCM will turn the MIL "OFF" on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
f A history DTC P0327 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
f DTC P0327 can be cleared by using the Tech 2 "Clear
Info" function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Ensures that the fault is present.
6E2–269
D06RW035–1