Dtc P2138 (Flash Code 124) - Isuzu N 2008 Series Workshop Manual

DTC P2138 (Flash Code 124)

Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal bracket. 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 and P0651 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.
Circuit/ System Testing DTC P2138
Step
Did you perform the Diagnostic System Check -
1 Engine Controls?
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
2
4. Monitor the DTC Information with a scan tool.
Is DTC P0641, P0651, P2122, P2123, P2127 or
P2128 also set?
Fully depress and release the accelerator pedal
while observing the DTC Information with a scan
3
tool.
Does the DTC fail this ignition?
Action
Engine Control System (4JJ1)
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 the 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 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.
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Value(s) Yes
—
Go to Step 2
—
Go to Applicable
DTC
—
Go to Step 4
1A-249
No
Go to Diagnostic
System Check -
Engine Controls
Go to Step 3
Go to Diagnostic
Aids