Isuzu 2008MY N Series, Руководство по ремонту

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1A-124 Engine Control System (4HK1)
DTC P0182 or P0183 (Flash Code 211)
Circuit Description
The fuel temperature (FT) sensor is installed to the fuel
supply pump. The FT sensor is a variable resistor and it
measures the temperature of the fuel entering the fuel
supply pump. The sensor has a signal circuit and a low
reference circuit. The ECM supplies 5 volts to the
signal circuit and a ground for the low reference circuit.
When the FT sensor is cold, the sensor resistance is
high. When the fuel temperature increases, the sensor
resistance decreases. With high sensor resistance, the
ECM detects a high voltage on the signal circuit. With
lower sensor resistance, the ECM detects a lower
voltage on the signal circuit. If the ECM detects an
excessively low or high signal voltage, DTC P0182 or
P0183 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.
• The engine run time is longer than 3 minutes.
(DTC P0183)
Condition for Setting the DTC
• The ECM detects that the FT sensor signal voltage
is less than 0.1 volts for 3 seconds. (DTC P0182)
• The ECM detects that the FT sensor signal voltage
is more than 4.85 volts for 3 seconds. (DTC
P0183)
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 FT substitution of default value.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A.
Diagnostic Aids
• Before starting a cold engine, FT sensor and
engine coolant temperature (ECT) sensor
temperature should be relatively close to each
other.
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
• Use the Temperature vs. Resistance table to test
the FT sensor at various temperature levels to
evaluate the possibility of a skewed sensor. A
skewed sensor could result in poor driveability
concerns.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0182
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 Fuel Temperature (FT) Sensor
parameter with a scan tool.
Is the FT 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 FT sensor harness connector.
3. Turn ON the ignition, with the engine OFF.
Is the FT Sensor parameter more than the
specified value?
4.5 volts
Go to Step 6 Go to Step 5
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