Isuzu 2008MY N Series, Руководство по ремонту

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Engine Control System (4HK1) 1A-119
DTC P0122 or P0123 (Flash Code 43)
Circuit Description
The intake throttle position sensor is installed on the
intake throttle valve body together with the control
solenoid. The intake throttle position sensor changes
output voltage according to intake throttle valve
position. The sensor has the following circuits.
• 5 volts reference circuit
• Low reference circuit
• Intake throttle position sensor signal circuit
The intake throttle position sensor provides a signal to
the ECM on the signal circuit, which is relative to the
position changes of the intake throttle valve. If the ECM
detects an excessively low or high signal voltage, DTC
P0122 or P0123 will set.
Condition for Running the DTC
• DTCs P060B and P0697 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 the intake throttle position
sensor signal voltage is less than 0.1 volts for 3
seconds. (DTC P0122)
• The ECM detects that the intake throttle position
sensor signal voltage is more than 4.9 volts for 3
seconds. (DTC P0123)
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.
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
PCircuit/ System Testing DTC P0122
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 P0697 also set?
—
Go to DTC P0697 Go to Step 3
3
Observe the Intake Throttle Position Sensor
parameter with a scan tool.
Is the Intake Throttle Position Sensor
parameter less than the specified value?
0.1 volts
Go to Step 4
Go to Diagnostic
Aids
4
1. Turn OFF the ignition.
2. Disconnect the intake throttle valve harness
connector.
3. Connect a DMM between the 5 volts reference
circuit (pin 6 of E-16) and a known good
ground.
4. Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified
value?
4.5 volts
Go to Step 5 Go to Step 6
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