2007 ISUZU KB P190 Workshop Repair Manual

fuel cap remote control refrigerant type instrument cluster service reset horn

Page 1825 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-208 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
16Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 1

Page 1826 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-209
DTC P0652 or P0653 (Flash Code 56)
Circuit Description
The ECM provides 5 volts reference voltage through
the reference circuit 2 to the following sensors:

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-209
DTC P0652 or P0653 (Flash Code 56)
Circuit Description
The ECM provides 5 volts reference voltage through
the reference circuit 2 to the following sensors:
• Accelerator pedal position (APP) sensor 2
• Fuel rail pressure (FRP) sensor
• Barometric pressure (BARO) sensor
• Camshaft position (CMP) sensor
• EGR 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 2. The ECM monitors the voltage on
the 5 volts reference circuit 2. If the ECM detects the
voltage is excessively low or high, DTC P0652 or
P0653 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 2 voltage is less than 4.7 volts. (DTC P0652)
• The ECM detects that the 5 volts reference circuit 2 voltage is more than 5.3 volts. (DTC P0653) 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.
Notice: • If this DTC is present, the engine cranks but does not start.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0652
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 barometric pressure (BARO) sensor harness connector.
3. Connect a DMM between the 5 volts reference circuit (pin 3 of E-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 9 Go to Step 4

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ISUZU KB P190 2007

Page 1827 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-210 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
41. Leave the DMM connected to the BARO
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the EGR valve harness connector.
4. Turn ON the i

6E-210 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
41. Leave the DMM connected to the BARO
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the EGR 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 5
5 1. Leave the DMM connected to the BARO
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the fuel rail pressure (FRP) 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 6
6 1. Leave the DMM connected to the BARO
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the camshaft position (CMP) 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 12 Go to Step 7
7 1. Leave the DMM connected to the BARO
sensor harness connector.
2. Turn OFF the ignition.
3. Disconnect the accelerator pedal position (APP) 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 13 Go to Step 8
8 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 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 15 Go to Step 14
9 Replace the BARO sensor. Refer to BARO Sensor
Replacement.
Did you complete the replacement? —
Go to Step 15
—
10Replace the EGR valve. Refer to EGR Valve
Replacement.
Did you complete the replacement? —
Go to Step 15
—
Step Action Value(s)Yes No

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ISUZU KB P190 2007

Page 1828 of 6020

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
—
12Repl

Page 1829 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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

Page 1830 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-213
DTC P0661 or P0662 (Flash Code 58)
Circuit Description
The ECM controls the swirl levels, which energize the
swirl control solenoid valve based on the engi

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-213
DTC P0661 or P0662 (Flash Code 58)
Circuit Description
The ECM controls the swirl levels, which energize the
swirl control solenoid valve based on the engine
running condition. The ECM commands the swirl
control solenoid valve to apply vacuum pressure to the
diaphragm actuator to operate swirl control butterflies
that is provided each intake port. If the ECM detects an
open circuit or short circuit on the solenoid valve circuit,
DTC P0661 or P0662 will set.
Condition for Running the DTC • The battery voltage is more than 9 volts.
• The ignition switch is ON.
Condition for Setting the DTC • The ECM detects a low voltage condition on the swirl control solenoid valve circuit when the
solenoid is commanded OFF. (DTC P0661)
• The ECM detects a high voltage condition on the swirl control solenoid valve circuit when the
solenoid is commanded ON. (DTC P0662)
Action Taken When the DTC Sets • 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. (DTC P0661)
• The ECM inhibits cruise control. (DTC P0661)
Condition for Clearing the 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 • If an intermittent condition is suspected, refer to Intermittent Conditions in this section.
Schematic Reference: Vacuum Hose Routing
Diagram and Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P0661
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. Turn ON the ignition, with the engine OFF.
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 swirl control solenoid valve harness connector.
3. Connect a test lamp between the ignition voltage feed circuit (pin 2 of E-67) and a
known good ground.
4. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate? —
Go to Step 4 Go to Step 6

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ISUZU KB P190 2007

Page 1831 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-214 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
41. Connect a test lamp between the control
circuit (pin 1 of E-67) and battery voltage.
2. Perform the Swirl Control Solenoid Test with a scan tool.
3. Comm

6E-214 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
41. Connect a test lamp between the control
circuit (pin 1 of E-67) and battery voltage.
2. Perform the Swirl Control Solenoid Test with a scan tool.
3. Command the solenoid valve ON and OFF.
Does the test lamp turn ON and OFF with each
command (if test is aborted, go to Step 5)? —
Go to Step 9 Go to Step 5
5 Does the test lamp remain illuminated with each
command? —
Go to Step 8 Go to Step 7
6 Repair the open circuit or high resistance between
the Engine (10A) fuse and the solenoid valve (pin 2
of E-67). Check the Engine (10A) fuse first.
Did you complete the repair? —
Go to Step 13
—
71. Test the control circuit between the ECM (pin
67 of E-90) and the solenoid valve (pin 1 of E-
67) for an open circuit or high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 10
8 1. Test the control circuit between the ECM (pin
67 of E-90) and the solenoid valve (pin 1 of E-
67) for a short to ground.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 12
9 1. Inspect for an intermittent and for poor
connections at the harness connector of the
solenoid valve (pins 1 and 2 of E-67).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 11
10 1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor connection at harness connector of the ECM
(pin 67 of E-90).
4. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 13 Go to Step 12
11 Replace the swirl control solenoid valve.
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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TO MODEL INDEX
ISUZU KB P190 2007

Page 1832 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-215
Circuit/ System Testing DTC P0662
131. Reconnect all previously disconnected fuse or
harness connector(s).
2. Clear the DTCs with a scan tool.
3. Turn OFF t

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