Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-173
DTC P0404 (Flash Code 45)
Circuit Description
The ECM controls the EGR valve opening based on the
engine running condition and by controlling the EGR
solenoid. The EGR valve position is detected by the
position sensor, and relayed to the ECM. If the ECM
detects a variance between the actual EGR valve
position and desired EGR valve position for a
calibrated amount of time while the EGR valve is
commanded ON, this DTC will set.
Condition for Running the DTC
• DTCs P0112, P0113, P0116, P0117, P0118,
P0409, P060B, P0651, P0651, P0697, P2227,
P2228 and P2229 are not set.
• The battery voltage is between 16 to 32 volts.
• The ignition switch is ON.
• The EGR control is commanded ON.
Condition for Setting the DTC
• The ECM detects that the actual EGR valve
position is more than 10% below the desired valve
position 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 EGR control.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A.
Notice: A history DTC remains 9,600 hours
(accumulated engine runtime) and will not clear with a
scan tool. (Euro 4 specification)
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
• A sticking or intermittently sticking the EGR valve
may set this DTC.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0404
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 P0409 also set?
—
Go to DTC P0409 Go to Step 3
3
1. Perform the EGR Solenoid Control with a scan
tool several times.
2. Command the Desired EGR Position Increase
and Decrease while observing the EGR
Position 1.
Does the EGR Position 1 parameter follow
within the specified value quick enough
(compare with a similar unit if available)?
±
5%
Go to Diagnostic
Aids Go to Step 4
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