Dtc P0107 Or P0108 (Flash Code 32) - Isuzu N 2008 Series Workshop Manual

1A-96 Engine Control System (4JJ1)

DTC P0107 or P0108 (Flash Code 32)

Circuit Description
The boost pressure sensor is located in the air
induction tubing. The boost pressure sensor is a
transducer that varies voltage according to changes in
the air pressure inside the air tubing. The sensor has
the following circuits.
• 5 volts reference circuit
• Low reference circuit
• Boost pressure sensor signal circuit
The boost pressure sensor provides a signal to the
ECM on the signal circuit, which is relative to the
pressure changes in the air tubing. The ECM should
detect a low signal voltage at a low boost pressure,
such as low engine load. The ECM should detect high
signal voltage at a high boost pressure, such as high
engine load. If the ECM detects an excessively low or
high signal voltage, DTC P0107 or P0108 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.
Circuit/ System Testing DTC P0107
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 P0697 also set?
Observe the Boost Pressure Sensor parameter
with a scan tool.
3
Is the Boost Pressure Sensor parameter less than
the specified value?
1. Turn OFF the ignition.
2. Disconnect
harness connector.
3. Connect a DMM between the 5 volts reference
4
circuit (pin 3 of E24) and a known good
ground.
4. Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified value?
Action
the boost pressure
Condition for Setting the DTC
• The ECM detects that the boost pressure sensor
signal voltage is less than 0.1 volts for 3 seconds.
(DTC P0107)
• The ECM detects that the boost pressure sensor
signal voltage is more than 4.9 volts for 3 seconds.
(DTC P0108)
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 uses a boost pressure substitution of
default value.
• 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.
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Value(s)
—
—
0.1 volts
sensor
4.5 volts
Yes
Go to Diagnostic
System Check -
Go to Step 2 Engine Controls
Go to DTC P0697
Go to Diagnostic
Go to Step 4
Go to Step 5
No
Go to Step 3
Aids
Go to Step 6