Isuzu 2000 Trooper Workshop Manual page 1167

6E–298
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0353 Ignition 3 Control Circuit
Circuit Description
ION Sensing Module has the function to energize and
de-energize the primary ignition coil in response to
signals from the PCM. The PCM controls ignition timing
and dwell time.
This diagnosis detects open circuit or short-circuiting in
the Ignition Electronic Spark Timing (EST) line by
monitoring EST signals. A failure determination is made
when the signal voltage remains higher or lower than the
threshold for corresponding fault code beyond a
predetermined time period.
When the PCM detects a problem on EST control circuit
3, it will set a DTC P0353.
Conditions for Setting the DTC
D The ignition is "ON."
D The engine is turning, determined by the 58X
crankshaft position input signal.
D The output voltage is not equal to 5 volts when output
is "ON."
D The output voltage is not equal to 0 volts when output
is "OFF."
D Ten test failures occur within 10 samples of continuous
spark events.
Action Taken When the DTC Sets
D The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
D The PCM will turn the MIL "OFF" on the third
consecutive trip cycle in which the diagnostic has been
run and the fault condition is no longer present.
D A history DTC P0353 will clear after 40 consecutive
warm-up cycles occur without a fault.
D DTC P0353 can be cleared by using the Tech 2 "Clear
Info" function or by disconnecting the PCM battery
feed.
D06RY00067