Isuzu 2008MY N Series, Руководство по ремонту

Страница: 270 / 404

Engine Control System (4HK1) 1A-267
DTC P2138 (Flash Code 124)
Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal control assembly.
The sensor is made up of two individual sensors within
one housing. The APP sensor 1 and APP sensor 2 are
hall element type sensors, each with the following
circuits.
• 5 volts reference circuit
• Low reference circuit
• Signal circuit
The ECM supplies 5 volts to the APP sensor on the 5
volts reference circuit. The ECM also provides a ground
on the low reference circuit. The APP sensor provides
a signal to the ECM on the signal circuits, which is
relative to the position changes of the accelerator pedal
angle. The APP sensor 1 signal voltage is low at rest
and increases as the pedal is depressed. The APP
sensor 2 signal voltage is high at rest and decreases as
the pedal is depressed. If the ECM detects that the
APP sensor 1 signal voltage and the APP sensor 2
signal voltage are out of the correlation, this DTC will
set.
Condition for Running the DTC
• DTCs P060B, P0641, P0651, P2122, P2123,
P2127 and P2128 are not set.
• The battery voltage is between 18 to 32 volts.
• The ignition switch is ON.
• The APP sensor 1 signal voltage is between 0.2 to
4.9 volts.
• The APP sensor 2 signal voltage is between 0.2 to
4.9 volts.
Condition for Setting the DTC
• The ECM detects that the APP sensor 1 and 2 are
more than 45% out of range of each other.
Action Taken When the DTC Sets
• The ECM illuminates the MIL on the second
consecutive driving cycle when the diagnostic runs
and fails. Refer to DTC Type Definitions for Action
Taken When the DTC Sets - Type B. (Euro 4
specification)
• The ECM illuminates MIL when the diagnostic runs
and fails. Refer to DTC Type Definitions for Action
Taken When the DTC Sets - Type A. (Except Euro
4 specification)
• The ECM blinks the exhaust brake indicator lamp
when the diagnostic runs and fails.
• The ECM inhibits exhaust brake control.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type B. (Euro 4
specification)
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A. (Except 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 P2138
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 P0641, P0651, P2122, P2123, P2127
or P2128 also set?
—
Go to Applicable
DTC Go to Step 3
3
Fully depress and release the accelerator pedal
while observing the DTC Information with a scan
tool.
Does the DTC fail this ignition?
—
Go to Step 4
Go to Diagnostic
Aids
LG4HKED-WE-0871.book 267 ページ ２００７年１１月２９日 木曜日 午後６時２９分