Diagnostic Trouble Code (Dtc) P0355 Ignition 5 Control Circuit - Isuzu Trooper 1999 Workshop Manual

6E–312
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0355 Ignition 5 Control Circuit

Circuit Description
The powertrain control module's (PCM) control circuit 5
provides a zero-volt or a 5-volt output signal to the ignition
coil. The normal voltage on the circuit is zero volts. When
the ignition coil receives the 5-volt signal from the PCM, it
provides a ground path for the B+ supply to the primary
side of the number 5 ignition coil. When the PCM shuts off
the 5 volts to the ignition coil, the ignition coil turns "OFF."
This causes the ignition coil primary magnetic field to
collapse, producing a voltage in the secondary coil which
fires the spark plug.
The circuit between the PCM and ignition coil is monitored
for an open circuit, short to voltage, and short to ground.
When the PCM detects a problem on ignition control
circuit 5, it will set a DTC P0355.
Conditions for Setting the DTC
f The ignition is "ON."
f The engine is turning, determined by the 58X
crankshaft position input signal.
f The output voltage is not equal to 5 volts when output
is "ON."
f The output voltage is not equal to 0 volts when output
is "OFF."
f Twenty test failures occur within 40 samples of
continuous spark events.
Action Taken When the DTC Sets
f The PCM will illuminate the malfunction indicator lamp
(MIL) the first time 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.
Conditions for Clearing the MIL/DTC
f 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.
f A history DTC P0355 will clear after 40 consecutive
warm-up cycles occur without a fault.
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