Isuzu 2008MY N Series, Руководство по ремонту

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1A-84 Engine Control System (4HK1)
DTC P0089 (Flash Code 151)
Description
The common rail fuel system is comprised of two fuel
pressure sections: a suction side between the fuel tank
and the fuel supply pump and a high-pressure side
between the fuel supply pump and the fuel injectors.
Fuel is drawn from the fuel tank via a feed pump and
then pumped into the fuel rail by two plungers, all of
which are internal to the fuel supply pump. This high
pressure is regulated by the ECM using the fuel rail
pressure (FRP) regulator dependant upon values from
the FRP sensor attached to the fuel rail. If the ECM
detects that fuel pressure is a certain pressure higher
than the desired pressure, this DTC will set.
Condition for Running the DTC
• DTCs P0091, P0092, P0192, P0193, P060B,
P0651, P0201 - P0204, P1261, P1262, P2146 and
P2149 are not set.
• The battery voltage is between 18 to 32 volts.
• The ignition switch is ON.
• The engine is running.
Condition for Setting the DTC
• The ECM detects that the actual fuel rail pressure
is more than 40 MPa (5,800 psi) over the desired
pressure for longer than 5 seconds.
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 pilot injection.
• 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
• An intermittently sticking FRP regulator may have
allowed the fuel pressure to become high enough
to set this DTC.
• Normal Fuel Rail Pressure readings on the scan
tool with the engine running in neutral at idle is
around 27 to 33 MPa (3,900 to 4,800 psi) after
warm up.
• A skewed FRP sensor value can set this DTC. The
FRP Sensor on the scan tool should read 0.9 to
1.0 volt with the ignition switch ON and engine
OFF after the engine has stopped running for a
minimum of 1 minute.
Schematic Reference: Fuel System Routing Diagram
and Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0089
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. Monitor the DTC Information with a scan tool.
Is DTC P0091, P0092, P0192, P0193, P0201
- P0204, P2146 or P2149 set?
—
Go to Applicable
DTC Go to Step 3
3
1. Turn OFF the ignition.
2. Wait 1 minute for the fuel pressure to bleed
down from the fuel rail.
3. Turn ON the ignition, with the engine OFF.
4. Observe the Fuel Rail Pressure (FRP) Sensor
parameter with the scan tool.
Does the scan tool indicate within the
specified value?
0.9 to 1.0 volt
Go to Step 4 Go to Step 5
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