P0206 Injector 6 Control Circuit - Isuzu 2000 Trooper Workshop Manual

6E–256
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0206 Injector 6 Control Circuit
Circuit Description
The powertrain control module (PCM) has six individual
injector driver circuits. Each controls an injector. When
the driver circuit is grounded by the PCM, the injector is
activated. The PCM monitors the current in each driver
circuit. The voltage on each driver is monitored to detect
a fault. If the voltage is not what the PCM expects to
monitor on the circuit, a DTC is set. This DTC is also set if
an injector driver is shorted to voltage or if there is an open
circuit.
Conditions for Setting the DTC
D The battery voltage is more than 9 volts.
D The engine is turning, determined by 58X crankshaft
position input signal.
D The injector voltage does not equal the ignition voltage
when the injector is commanded "OFF" or the injector
voltage does not equal 0 volts when the injector is
commanded "ON."
D The above conditions are met for 15 seconds.
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 "OFF" the MIL on the third
consecutive trip cycle in which the diagnostic has been
run and the fault is no longer present.
D A history DTC P0206 will clear after 40 consecutive
warm-up cycles occur without a fault.
D DTC P0206 can be cleared by using the Tech 2 "Clear
Info" function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An injector driver circuit that is open or shorted to voltage
will cause a DTC P0206 to set. It will also cause a misfire
due to an inoperative injector. A misfire DTC will also be
set indicating which cylinder is inoperative.
Long term and short term fuel trims that are excessively
high or low are a good indication that an injector is faulty.
Use Fuel Injector Coil Test Procedure to check for faulty
injectors.
Test Description
The number(s) below refer to the step number(s) on the
Diagnostic Chart.
3. This step determines if DTC P0206 is the result of a
hard failure or an intermittent condition.
D06RY00086