Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-67
DTC P0045 (Flash Code 33)
Circuit Description
The position of the turbocharger nozzle is controlled by
the variable nozzle turbocharger (VNT) control module
based on the command from the ECM. The VNT
control module controls a drive signal to the
turbocharger nozzle control solenoid that installed to
the turbocharger assembly by utilizing position sensor
inputs to control the turbocharger nozzles. When the
engine is not under load, the turbocharger nozzles are
in an open position, or no boost condition. When the
engine is under load, the VNT control module
commands the control solenoid to close the
turbocharger nozzles, thus increasing the boost. The
ECM will vary the boost dependant upon the load
requirements of the engine. The VNT control module
has the ability to perform internal diagnostics for
voltage and signal input and output status. If the VNT
control module senses an error in the nozzle position
signals, solenoid control signal, or VNT control module
voltage error, the VNT control module will send a
message to the ECM via the controller area network
(CAN) communication bus and sets this DTC.
Condition for Running the DTC
• The battery voltage is between 20 to 32 volts.
• The ignition switch is ON.
Condition for Setting the DTC
Either of following condition is met:
• The VNT control module detects system voltage is
too high.
• The VNT control module detects all nozzle position
sensor signal are stuck low or high.
• The VNT control module detects an open circuit,
short to ground or short to voltage circuit on the
solenoid circuit.
• The VNT control module detects solenoid or
nozzle control is stuck condition.
Action Taken When the DTC Sets
• The ECM illuminates the MIL when the diagnostic
runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
• The ECM limits fuel injection quantity.
• The ECM inhibits EGR control.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A.
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
• A sticking or intermittently sticking the
turbocharger nozzle control actuator may set this
DTC.
Notice: If the VNT control module detects an open
circuit on the solenoid circuit, the Vane Control
Solenoid Error parameter on the scan tool indicates
Stuck.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0045
Step Action Value(s) Yes No
1
Did you perform the Diagnostic System Check
- Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check -
Engine Controls
2
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Observe the Turbocharger Control Module
Error parameter with a scan tool.
Does the scan tool indicate High Voltage?
—
Refer to DTC P0563 Go to Step 3
3
Observe the Vane Control Solenoid Error
parameter with a scan tool.
Does the scan tool indicate Stuck or Short
Circuit?
—
Go to Step 5 Go to Step 4
4
Observe the Vane Position Sensor Error parameter
with a scan tool.
Does the scan tool indicate All High or All
Low?
—
Go to Step 9
Go to Diagnostic
Aids
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