2007 ISUZU KB P190 Workshop Repair Manual

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Page 1705 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-88 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
61. Turn OFF the ignition for 30 seconds.
2. Disconnect the FRP regulator harness connector.
3. Connect a test lamp between the high side circuit (pin 1 of E

6E-88 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
61. Turn OFF the ignition for 30 seconds.
2. Disconnect the FRP regulator harness connector.
3. Connect a test lamp between the high side circuit (pin 1 of E-50) and a known good
ground.
4. Turn ON the ignition, with the engine OFF. DO NOT start the engine.
Does the test lamp illuminate then go out? —
Go to Step 7 Go to Step 10
7 1. Turn OFF the ignition for 30 seconds.
2. Connect a test lamp between the low side circuit (pin 2 of E-50) and battery voltage.
3. Turn ON the ignition, with the engine OFF. DO NOT start the engine.
Does the test lamp illuminate then go out? —
Go to Step 12 Go to Step 11
8 1. Test the high side circuits between the ECM
(pins 34 and 54 of E-90) and the FRP
regulator (pin 1 of E-50) for a short to battery
or ignition voltage.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 15
9 1. Test the low side circuits between the ECM
(pins 50 and 70 of E-90) and the FRP
regulator (pin 2 of E-50) for a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 15
10 1. Test the high side circuits between the ECM
(pins 34 and 54 of E-90) and the FRP
regulator (pin 1 of E-50) for the following
conditions:
• An open circuit
• A short to ground
• A short to the low side circuit
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 13
11 Important:
The ECM may be damaged if the FRP
regulator low side circuit is shorted to a voltage
source.
1. Test the low side circuits between the ECM (pins 50 and 70 of E-90) and the FRP
regulator (pin 2 of E-50) for the following
conditions:
• An open circuit
• A short to battery or ignition voltage
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 13
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

Page 1706 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-89
121. Inspect for an intermittent and for poor
connections at the harness connector of the
FRP regulator (pins 1 and 2 of E-50).
2. Repair the connection(s) a

Page 1707 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-90 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
DTC P0093 (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

6E-90 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
DTC P0093 (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
low as compared with the engine speed, 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.
Condition for Setting the DTC • The ECM detects that the actual fuel rail pressure is lower than 15 MPa (2,180 psi) 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 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 P0093
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

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ISUZU KB P190 2007

Page 1708 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-91
21. Inspect the high pressure side between the
fuel supply pump and the fuel injectors for fuel
leakage. The following components may
contain an external lea

Page 1709 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-92 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
61. Turn OFF the ignition.
2. Place the transmission in Neutral and set the parking brake.
3. Start the engine.
4. Perform the Cylinder Balance Test with a s

6E-92 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
61. Turn OFF the ignition.
2. Place the transmission in Neutral and set the parking brake.
3. Start the engine.
4. Perform the Cylinder Balance Test with a scan tool.
5. 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 14 Go to Step 7
7 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. Repair or replace as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 8
8 Notice:
Make sure the in-tank fuel pump operation
before performing the following procedures. Refer
to In-tank Fuel Pump System Check in this section.
1. Turn OFF the ignition.
2. Disconnect the fuel hose from the fuel supply pump suction side. In order to measure the
discharged fuel amount, put the hose into a
bottle or a container with a scale. (The inlet of
a bottle or a container must be larger than the
diameter of hose.)
3. Turn ON the ignition for 20 seconds, with the engine OFF.
4. Turn OFF the ignition for 10 seconds.
5. Perform 3 and 4 three times. The accumulated fuel of three ignition cycles must be more than
300 cc. (Normal amount is more than 100 cc
per one ignition cycle.)
Notice: If there is a leak or a restriction on the
suction side, the fuel from the hose will not flow out
sufficiently that is most likely caused by fuel
leakage, clogged fuel filter, kinked or crushed fuel
hose or pipe. Also inside the fuel tank for any
foreign materials may be getting drawn into the fuel
line pickup.
6. Repair fuel system leaking or restrictions as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 9
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

Page 1710 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-93
91. Remove the fuel hose that connects to the fuel
supply pump suction side and substitute a
clear hose.
Notice: The hose must be cleaned before
connecting t

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-93
91. Remove the fuel hose that connects to the fuel
supply pump suction side and substitute a
clear hose.
Notice: The hose must be cleaned before
connecting to the fuel line. Otherwise, foreign
material internal to the hose may damage the fuel
supply pump.
2. Bleed the fuel system. Repeat as necessary until the engine starts.
3. Let the engine run at idle for at least 1 minute.
4. Observe the clear hose while holding the engine speed higher than 3000 RPM for a
minimum of 1 minute.
Notice: If many air bubbles appear in the fuel,
check the fuel line connections between the fuel
supply pump and the fuel tank for tightness and all
fuel hoses for cuts, cranks and for the uses of
proper clamps.
5. Repair or replace as necessary.
Did you find and correct the condition? —
Go to Step 16 Go to Step 10
10 1. 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 16 Go to Step 15
11 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 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 16 Go to Step 12
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

Page 1711 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-94 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
12Replace the FRP sensor. Refer to FRP Sensor
Replacement.
Did you complete the replacement? —
Go to Step 16
—
13Important:
Replacement fuel injector m

Page 1712 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-95
DTC P0101 (Flash Code 92)
Circuit Description
The mass air flow (MAF) sensor is an air flow meter
that measures the amount of air that enters the engine.
It

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-95
DTC P0101 (Flash Code 92)
Circuit Description
The mass air flow (MAF) sensor is an air flow meter
that measures the amount of air that enters the engine.
It is fitted between the air cleaner and turbocharger. A
small quantity of air that enters the engine indicates
deceleration or idle speed. A large quantity of air that
enters the engine indicates acceleration or a high load
condition. The ECM will calculate a predicted MAF
value and compares the actual MAF sensor voltage
signal to the predicted MAF value. This comparison will
determine if the signal is stuck, or is too low or too high
for a given operating condition. If the ECM detects that
the actual MAF sensor signal voltage is not within a
predetermined range of the calculated MAF value, this
DTC will set.
Condition for Running the DTC • DTCs P0045, P0102, P0103, P0107, P0108, P 0 11 2 , P 0 11 3 , P 0 11 6 , P 0 11 7 , P 0 11 8 , P 0 1 2 2 ,
P0123, P0234, P0403, P0404, P0405, P0406,
P0638, P0652, P0653, P0698, P0699, P1404,
P2100, P2101, P2103, P2227, P2228 and P2229
are not set.
AND following conditions are met longer than 10
seconds.
• The battery voltage is between 10.0 to 16.0 volts.
• The ignition switch is ON.
• The intake air temperature is less than 110 °C
(230 °F).
• The engine coolant temperature is between 0 to 11 0 °C (32 to 230 °F).
• The engine speed is between 850 to 3700 RPM.
• The EGR control is commanded OFF.
• The intake throttle control is commanded OFF.
• The commanded fuel injection quantity is OFF (accelerator pedal is not depressed).
• The engine run time is longer than 5 seconds. Condition for Setting the DTC
• The ECM detects that the MAF sensor signal voltage is not within a predetermined range of the
calculated MAF value for longer than 10 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 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 • Any unmetered air that enters the engine downstream of the MAF sensor will cause this
DTC to set.
• High resistance in the MAF sensor circuit will set this DTC.
• A short between the signal circuit of the MAF sensor and the signal circuit of the intake air
temperature (IAT) sensor will skew the MAF
sensor lower than normal at higher air flows.
Notice: • The MAF Sensor parameter on scan tool will only update with engine running or one time after the
key is cycled when the ignition has been turned
OFF for longer than 10 seconds.
Schematic Reference : Engine Controls Schematics
Connector End View Reference : Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0101
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

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