Isuzu 2008MY N Series, Руководство по ремонту

Страница: 179 / 404

1A-176 Engine Control System (4HK1)
DTC P0409 (Flash Code 44)
Circuit Description
The exhaust gas recirculation (EGR) position sensor is
installed on the EGR valve body together with the
control solenoid. The sensor is made up three
individual sensors within one housing. The EGR
position sensor 1, EGR position sensor 2 and EGR
position sensor 3 are hall element type sensors, each
with the following circuits.
• 5 volts reference circuit
• Low reference circuit
• Signal circuit
The EGR position sensor provides a low or high signal
state to the ECM on the signal circuits, which is relative
to the position changes of the EGR valve. If the ECM
detects that each EGR position sensor signal state is
out of correlation such as all low signal state or high
signal state, this DTC will set.
Condition for Running the DTC
• DTCs P060B and P0651 are not set.
• The battery voltage is between 18 to 32 volts.
• The ignition switch is ON.
Condition for Setting the DTC
• The ECM detects that all EGR valve position
sensor signals are stuck low or high for longer than
3 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 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.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0409
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 P0651 also set?
—
Go to DTC P0651 Go to Step 3
3
1. Turn OFF the ignition.
2. Disconnect the EGR valve harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the EGR Position 1, 2 and 3
parameters with a scan tool.
Is there parameter which indicate High?
—
Go to Step 7 Go to Step 4
4
Connect a DMM between the 5 volts reference
circuit (pin 1 of E-15) and a known good ground.
Is the DMM voltage more than the specified
value?
4.5 volts
Go to Step 5 Go to Step 8
LG4HKED-WE-0871.book 176 ページ ２００７年１１月２９日 木曜日 午後６時２９分