sensor ISUZU KB P190 2007 Workshop Repair Manual

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-211
Circuit/ System Testing DTC P0653
11Replace the FRP sensor. Refer to FRP Sensor
Replacement.
Did you complete the replacement? —
Go to Step 15
—
12Replace the CMP sensor. Refer to CMP Sensor
Replacement.
Did you complete the replacement? —
Go to Step 15
—
13Replace the APP sensor. Refer to APP Sensor
Replacement.
Did you complete the replacement? —
Go to Step 15
—
14Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 15
—
151. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 16
16 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK
Step
Action Value(s)Yes No
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.
Does the DTC fail this ignition? —
Go to Step 3 Go to Diagnostic
Aids

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ISUZU KB P190 2007

6E-212 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
31. Test the 5 volts reference circuit between the
ECM and the following components for a short
to battery or ignition voltage:
• ECM (pin 19 of E-90) and BARO sensor (pin 3 of E-40)
• ECM (pin 31 of E-90) and EGR position sensor (pin 1 of E-71)
• ECM (pin 47 of E-90) and FRP sensor (pin 3 of E-48)
• ECM (pin 46 of E-90) and CMP sensor (pin 3 of E-39)
• ECM (pin 9 of C-58) and APP sensor 2 (pin 8 of C-40)
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 5 Go to Step 4
4 Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 5
—
51. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 6
6 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-217
DTC P0698 or P0699 (Flash Code 57)
Circuit Description
The ECM provides 5 volts reference voltage through
the reference circuit 3 to the following sensors:
• Accelerator pedal position (APP) sensor 3
• Boost pressure sensor
• Crankshaft position (CKP) sensor
• Intake throttle position sensor
The 5 volts reference circuits are independent of each
other outside the ECM, but are bussed together inside
the ECM. Therefore, a short circuit condition on one 5
volts reference circuit affects the entire 5 volts
reference circuit 3. The ECM monitors the voltage on
the 5 volts reference circuit 3. If the ECM detects the
voltage is excessively low or high, DTC P0698 or
P0699 will set.
Condition for Running the DTC • The battery voltage is more than 6 volts.
• The ignition switch is ON.
Condition for Setting the DTC • The ECM detects that the 5 volts reference circuit 3 voltage is less than 4.7 volts. (DTC P0698) • The ECM detects that the 5 volts reference circuit
3 voltage is less than 5.3 volts. (DTC P0699)
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 limits fuel injection quantity.
• The ECM inhibits pilot injection.
• The ECM inhibits EGR control.
• The ECM inhibits cruise 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.
Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0698
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.
Does the DTC fail this ignition? —
Go to Step 3 Go to Diagnostic
Aids
3 1. Turn OFF the ignition.
2. Disconnect the accelerator pedal position (APP) sensor harness connector.
3. Connect a DMM between the 5 volts reference circuit (pin 1 of C-40) and a known good
ground.
4. Turn ON the ignition, with engine OFF.
Is the DMM voltage more than the specified value? 4.7 volts
Go to Step 8 Go to Step 4
4 Notice:
If no boost pressure sensor is installed,
skip to Step 5.
1. Leave the DMM connected to the APP sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the boost pressure harness connector.
4. Turn ON the ignition, with the engine OFF.
Does the DMM voltage change to more than the
specified value? 4.7 volts
Go to Step 9 Go to Step 5

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ISUZU KB P190 2007

6E-218 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
51. Leave the DMM connected to the APP sensor
harness connector.
2. Turn OFF the ignition.
3. Disconnect the intake throttle valve harness connector.
4. Turn ON the ignition, with the engine OFF.
Does the DMM voltage change to more than the
specified value? 4.7 volts
Go to Step 10 Go to Step 6
6 1. Leave the DMM connected to the APP sensor
harness connector.
2. Turn OFF the ignition.
3. Disconnect the camshaft position (CKP) sensor harness connector.
4. Turn ON the ignition, with the engine OFF.
Does the DMM voltage change to more than the
specified value? 4.7 volts
Go to Step 11 Go to Step 7
7 1. Test the 5 volts reference circuit between the
ECM and the following components for a short
to ground or short to the low reference circuit:
• ECM (pin 7 of C-58) and APP sensor 3 (pin 1 of C-40)
• ECM (pin 20 of E-90) and boost pressure sensor (pin 3 of E-107)
• ECM (pin 36 of E-90) and intake throttle position sensor (pin 6 of E-38)
• ECM (pin 37 of E-90) and CKP sensor (pin 3 of E-52)
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 12
8 Replace the APP sensor. Refer to APP Sensor
Replacement.
Did you complete the replacement? —
Go to Step 13
—
9Replace the boost pressure sensor. Refer to Boost
Pressure Sensor Replacement.
Did you complete the replacement? —
Go to Step 13
—
10Replace the intake throttle valve. Refer to Intake
Throttle Valve Replacement.
Did you complete the replacement? —
Go to Step 13
—
11Replace the CKP sensor. Refer to CKP Sensor
Replacement.
Did you complete the replacement? —
Go to Step 13
—
12Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 13
—
Step Action Value(s)Yes No

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ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-219
Circuit/ System Testing DTC P0699
131. Reconnect all previously disconnected
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.
Did the DTC fail this ignition? —
Go to Step 3 Go to Step 14
14 Observe the DTC Information with a scan tool.
Are there any DTCs that you have not diagnosed? —
Go to DTC List System OK
Step Action Value(s) Yes No
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.
Does the DTC fail this ignition? —
Go to Step 3 Go to Diagnostic
Aids
3 1. Test the 5 volts reference circuit between the
ECM and the following components for a short
to battery or ignition voltage:
• ECM (pin 7 of C-58) and APP sensor 3 (pin 1 of C-40)
• ECM (pin 20 of E-90) and boost pressure sensor (pin 3 of E-107)
• ECM (pin 36 of E-90) and intake throttle position sensor (pin 6 of E-38)
• ECM (pin 37 of E-90) and CKP sensor (pin 3 of E-52)
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 5 Go to Step 4
4 Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 5
—

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ISUZU KB P190 2007

6E-226 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
DTC P1093 (Flash Code 227)
Description
The common rail fuel system is comprised of two fuel
pressure sections: a suction side between the fuel tank
and the fuel supply pump and a high-pressure side
between the fuel supply pump and the fuel injectors.
Fuel is drawn from the fuel tank via a feed pump and
then pumped into the fuel rail by two plungers, all of
which are internal to the fuel supply pump. This high
pressure is regulated by the ECM using the fuel rail
pressure (FRP) regulator dependant upon values from
the FRP sensor attached to the fuel rail. If the ECM
detects that the fuel rail pressure is certain pressure
lower than the desired pressure, this DTC will set.
Condition for Running the DTC • DTC P0087, P0091, P0092, P0192, P0193, P0652, P0653, P0201 - P0204, P1064, P1065,
P124B and P2146 - P2151 are not set.
• The battery voltage is more than 9 volts.
• The ignition switch is ON.
• The engine is running.
• The FRP regulator commanded fuel flow is more than a threshold.
Condition for Setting the DTC • The ECM detects that the actual fuel rail pressure is more than 10 to 20 MPa (1,450 to 2,900 psi)
below the desired pressure for longer than 5
seconds.
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 limits fuel injection quantity. • The ECM inhibits pilot injection.
• The ECM inhibits cruise control.
Condition for Clearing the DTC • Refer to DTC Type Definitions for Condition for Clearing the MIL/ DTC - Type A.
Diagnostic Aids • An intermittently sticking FRP regulator may have allowed the fuel pressure to become low enough to
set this DTC.
• Normal Fuel Rail Pressure readings on the scan tool with the engine running in neutral at idle is
around 27 to 33 MPa (3,900 to 4,800 psi) after
warm up.
• A skewed FRP sensor value can set this DTC. The FRP Sensor on the scan tool should read 0.9 to
1.0 volt with the key ON and engine OFF after the
engine has stopped running for a minimum of 1
minute.
Notice: • This DTC most likely indicates a loss of fuel pressure by a restricted suction side fuel line.
Inspect the suction side fuel restriction between
the fuel supply pump and the fuel tank.
• If the fuel tank is empty or near empty, air might be allowed to go into the fuel system. With air in the
fuel system, smooth flow of fuel into the supply
pump is interrupted and this DTC may set. Perform
bleeding of fuel system after refilling.
Schematic Reference: Fuel System Routing Diagram
and Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P1093
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 P0087, P0091, P0092, P0192, P0193,
P0201 - P0204, P1064, P1065, P1094, P124B or
P2146 - P2151 set? —
Go to Applicable DTC Go to Step 3

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ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-227
31. Turn OFF the ignition.
2. Wait 1 minute for the fuel pressure to bleed down from the fuel rail.
3. Turn ON the ignition, with the engine OFF. DO NOT start the engine.
4. Observe the Fuel Rail Pressure (FRP) Sensor parameter with the scan tool.
Does the scan tool indicate within the specified
value? 0.9 to 1.0 volt
Go to Step 4 Go to Step 10
4 1. Turn OFF the ignition.
2. Place the transmission in Neutral and set the parking brake.
3. Start the engine.
4. Accelerate the engine between idle and W.O.T. (accelerator pedal full travel) many
times.
5. Let idle for at least 3 minutes while observing the DTC Information with a scan tool.
Is DTC P1094 set? —
Go to Step 14 Go to Step 5
5 1. Start the engine.
2. Perform the Cylinder Balance Test with a scan tool.
3. Command each injector OFF and verify an engine speed change for each injector.
Is there an injector that does not change engine
speed when commanded OFF? —
Go to Step 12 Go to Step 6
6 1. Check the fuel system line connections
between the fuel tank and the fuel supply
pump for tightness and all fuel hoses for cuts,
cracks and for the use of proper clamps.
Notice: Air in the fuel system will cause fuel rail
pressure fluctuations especially at high engine
speed and load, which may set this DTC.
2. Start the engine and check for high side fuel system leaks at the fuel supply pump and fuel
rail.
Notice: Fuel may leak under the cylinder head
cover from the inlet high pressure line. In such
case, the engine oil level will rise. Inspect for fuel
leakage into the engine oil.
3. Repair any fuel system leaks as necessary.
Did you find and correct the condition? —
Go to Step 15 Go to Step 7
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-229
91. Turn OFF the ignition.
2. Disconnect the FRP regulator harness connector.
3. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the FRP regulator (pins 1 and 2
of E-50).
4. Disconnect the ECM harness connector.
5. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the ECM (pins 34, 50, 54 and 70
of E-90).
6. Test for high resistance on each circuit.
7. Repair the connection(s) or circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 15 Go to Step 13
10 1. Turn OFF the ignition.
2. Disconnect the FRP sensor harness connector.
3. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the FRP sensor (pins 1, 2 and 3
of E-48).
4. Disconnect the ECM harness connector.
5. Inspect for an intermittent, for poor connections and corrosion on at the harness
connector of the ECM (pins 47, 48, 68 and 69
of E-90).
6. Test for high resistance on each circuit.
7. Repair the connection(s) or circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 15 Go to Step 11
11 Replace the FRP sensor. Refer to FRP sensor
Replacement.
Did you complete the replacement? —
Go to Step 15
—
12Important:
Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that does not
change engine speed when commanded OFF.
Refer to Fuel Injector Replacement/ Fuel Injector
ID Code Data Programming.
Did you complete the replacement? —
Go to Step 15
—
13Important:
The fuel supply pump must be timed to
the engine and adjustment value must be learned
to the ECM.
Notice: Always replace the fuel filter cartridge
when a fuel supply pump is replaced.
Replace the fuel supply pump and fuel filter
cartridge. Refer to Fuel Supply Pump Replacement
and Fuel Filter Cartridge Replacement.
Did you complete the replacement? —
Go to Step 15
—
Step Action Value(s)Yes No

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ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-231
DTC P1094 (Flash Code 226)
Description
The common rail fuel system is comprised of two fuel
pressure sections: a suction side between the fuel tank
and the fuel supply pump and a high-pressure side
between the fuel supply pump and the fuel injectors.
Fuel is drawn from the fuel tank via a feed pump and
then pumped into the fuel rail by two plungers, all of
which are internal to the fuel supply pump. This high
pressure is regulated by the ECM using the fuel rail
pressure (FRP) regulator dependant upon values from
the FRP sensor attached to the fuel rail.
If the ECM detects that the difference between the
actual and the desired fuel pressure is small at low
engine speed but the FRP regulator commanded fuel
flow is certain amount high, this DTC will set. (FRP
Regulator Commanded High DTC)
If the ECM detects that the fuel rail pressure is sharply
decreased when fuel cut, this DTC will also set. (Fuel
Pressure Drop DTC)
Condition for Running the DTC
FRP Regulator Commanded High DTC • DTCs P0087, P0091, P0092, P0117, P0118, P0182, P0183, P0192, P0193, P0500, P0501,
P0652, P0653, P0201 - P0204, P1064, P1065,
P124B and P2146 - P2151 are not set.
• The battery voltage is more than 9 volts.
• The ignition switch is ON.
• The accelerator pedal is not depressed.
• The engine coolant temperature is more than 50 °C
(122 °F).
• The vehicle speed is less than 3km/h (2MPH).
Fuel Pressure Drop DTC
• DTCs P0087, P0091, P0092, P0182, P0183, P0192, P0193, P0652, P0653, P0201 - P0204,
P1064, P1065, P124B and P2146 - P2151 are not
set.
• The battery voltage is more than 9 volts.
• The ignition switch is ON.
• The accelerator pedal is not depressed.
• The engine speed is more than 1500RPM.
• The vehicle speed is more than 3km/h (2MPH).
Condition for Setting the DTC
FRP Regulator Commanded High DTC • The ECM detects that the FRP regulator commanded fuel flow is more than a
predetermined range for longer than 10 seconds
when the engine speed is near idle speed.
Fuel Pressure Drop DTC
• The ECM detects that the fuel rail pressure is dropped more than a threshold when the
commanded fuel is cut. Action Taken When the DTC Sets
FRP Regulator Commanded High DTC • 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 limits fuel injection quantity.
• The ECM inhibits pilot injection.
• The ECM inhibits cruise control.
Fuel Pressure Drop DTC
• The ECM illuminates the SVS lamp when the diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (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 limits fuel injection quantity.
• The ECM inhibits pilot injection.
• The ECM inhibits cruise control.
• The ECM stops engine running when the vehicle speed is lower than 5 km/h (3 MPH) for 5 seconds.
The engine will run after the key is cycled when the
ignition has been tuned OFF for longer than 10
seconds.
Condition for Clearing the DTC
FRP Regulator Commanded High DTC • Refer to DTC Type Definitions for Condition for Clearing the MIL/ DTC - Type A.
Fuel Pressure Drop DTC
• Refer to DTC Type Definitions for Condition for Clearing the SVS Lamp/ DTC - Type C. (Euro 4
Specification)
• Refer to DTC Type Definitions for Condition for Clearing the MIL/ DTC - Type A. (Except Euro 4
Specification)
Diagnostic Aids • An intermittently sticking FRP regulator may have allowed the fuel pressure to become low enough to
set this DTC.
• Normal Fuel Rail Pressure readings on the scan tool with the engine running in neutral at idle is
around 27 to 33 MPa (3,900 to 4,800 psi) after
warm up.
• A skewed FRP sensor value can set this DTC. The FRP Sensor on the scan tool should read 0.9 to
1.0 volt with the key ON and engine OFF after the
engine has stopped running for a minimum of 1
minute.

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ISUZU KB P190 2007

6E-232 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
Notice:• This DTC most likely indicates a loss of fuel pressure by a fuel leak from the high pressure
side. Inspect the high pressure side fuel leakage
between the fuel supply pump and fuel injector
first. • If the fuel tank is empty or near empty, air might be
allowed to go into the fuel system. With air in the
fuel system, smooth flow of fuel into the supply
pump is interrupted and this DTC may set. Perform
bleeding of fuel system after refilling.
Schematic Reference: Fuel System Routing Diagram
and Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P1094
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. Inspect the high pressure side between the
fuel supply pump and the fuel injectors for fuel
leakage. The following components may
contain an external leak.
• Fuel supply pump
• Fuel rail
• Pressure limiter valve
• Fuel rail pressure (FRP) sensor
• Fuel pipe between the fuel supply pump and fuel rail
• Fuel pipe between the fuel rail and fuel injectors
• Each fuel pipe sleeve nuts
Notice: Fuel may leak under the cylinder head
cover from the inlet high pressure line. In such
case, the engine oil level will rise. Inspect for fuel
leakage into the engine oil.
Notice: Remove and inspect the inlet high
pressure joint to the fuel injectors for fuel leaking
from the sleeve nut(s). Replace the fuel injector
and injection pipe when foreign material was in
contact.
2. Repair any fuel system leaks as necessary.
Did you find and correct the condition? —
Go to Step 19 Go to Step 3
3 1. Remove each glow plug from the cylinder
head.
2. Inspect for fuel leakage into the combustion chamber.
Is there a cylinder that fuel leakage into the
combustion chamber? —
Go to Step 15 Go to Step 4
4 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 P0087, P0091, P0092, P0192, P0193,
P0201 - P0204, P1064, P1065, P124B or P2146 -
P2151 set? —
Go to Applicable DTC Go to Step 5

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ISUZU KB P190 2007