2007 ISUZU KB P190 Workshop Repair Manual

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Page 1873 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-256 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
51. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running

Page 1874 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-257
DTC P1664 (Flash Code 76)
Circuit Description
The service vehicle soon (SVS) lamp is located on the
instrument panel (IP) cluster. The SVS lamp informs
the

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-257
DTC P1664 (Flash Code 76)
Circuit Description
The service vehicle soon (SVS) lamp is located on the
instrument panel (IP) cluster. The SVS lamp informs
the driver that a non-emission related fault has
occurred and vehicle service required.
The ECM monitors the SVS lamp control circuit for
conditions that are incorrect for the commanded state
of the SVS lamp. For example, a failure condition exists
if the ECM detects low voltage when the SVS lamp is
commanded OFF, or high voltage when the SVS lamp
is commanded ON. If the ECM detects an improper
voltage level on the control circuit, this DTC will set.
Condition for Running the DTC • The ignition voltage is more than 9 volts.
• The ignition switch is ON.
Condition for Setting the DTC
Low Voltage DTC • The ECM detects a low voltage condition on the SVS lamp control circuit when the lamp is
commanded OFF.
High Voltage DTC
• The ECM detects a high voltage condition on the SVS lamp control circuit when the lamp is
commanded ON. Action Taken When the DTC Sets
Low Voltage DTC • The ECM will not illuminate the MIL or SVS lamp.
• Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type D.
High Voltage 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.
Condition for Clearing the DTC
Low Voltage DTC • Refer to DTC Type Definitions for Condition for Clearing the DTC - Type D.
High Voltage DTC
• Refer to DTC Type Definitions for Condition for Clearing the SVS Lamp/ DTC - Type C.
Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P1664
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. Verify whether the instrument panel (IP)
cluster is operational.
2. Install a scan tool.
3. Perform the Service Vehicle Soon (SVS) Lamp Control with a scan tool.
4. Command the lamp ON and OFF.
Does the SVS lamp turn ON and OFF with each
command? —
Go to Diagnostic Aids Go to Step 3
3 1. Turn OFF the ignition.
2. Inspect the Meter (10A) fuse in the cabin fuse block.
Is the Meter (10A) fuse open? —
Go to Step 4 Go to Step 5
4 Replace the Meter (10A) fuse. If the fuse continues
to open, repair the short to ground on one of the
circuits that is fed by the Meter (10A) fuse or
replace the shorted attached component.
Did you complete the repair? —
Go to Step 17
—

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ISUZU KB P190 2007

Page 1875 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-258 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
51. Turn OFF the ignition.
2. Disconnect the ECM J-2 (C-58) harness connector.
3. Turn ON the ignition, with the engine OFF.
Is the SVS lamp OFF? —
Go to

6E-258 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
51. Turn OFF the ignition.
2. Disconnect the ECM J-2 (C-58) harness connector.
3. Turn ON the ignition, with the engine OFF.
Is the SVS lamp OFF? —
Go to Sep 6 Go to Step 12
6 1. Remove the Meter (10A) fuse that supplies
voltage to the SVS lamp.
2. Turn ON the ignition, with the engine OFF.
3. Measure the voltage from the SVS lamp control circuit in the ECM harness connector
(pin 71 of C-58) to a known good ground.
Is the voltage less than the specified value? 1 volt
Go to Step 7 Go to Step 13
7 1. Turn OFF the ignition.
2. Reinstall the Meter (10A) fuse.
3. Turn ON the ignition, with the engine OFF.
4. Connect a 3-amp fused jumper wire between the ECM harness connector (pin 71 of C-58)
and a known good ground.
Is the SVS lamp illuminated? —
Go to Step 11 Go to Step 8
8 1. Turn OFF the ignition.
2. Remove the IP cluster.
3. Connect a test lamp between the ignition voltage feed circuit of the IP cluster harness
connector (pin 8 of B-24) and a known good
ground.
4. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate? —
Go to Step 9 Go to Step 14
9 1. Test the control circuit between the ECM (pin
71 of C-58) and the IP cluster (pin 26 of B-23)
for an open circuit or high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 17 Go to Step 10
10 1. Inspect for an intermittent and for poor
connections at the harness connector of the
IP cluster (pin 8 of B-24 and pin 26 of B-23).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 17 Go to Step 15
11 1. Inspect for an intermittent and for a poor
connection at the harness connector of the
ECM (pin 71 of C-58).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 17 Go to Step 16
12 Repair the short to ground between the ECM (pin
71 of C-58) and the IP cluster (pin 26 of B-23).
Did you complete the repair? —
Go to Step 17
—
13Repair the short to battery or ignition voltage
between the ECM (pin 71 of C-58) and the IP
cluster (pin 26 of B-23).
Did you complete the repair? —
Go to Step 17
—
Step Action Value(s)Yes No

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Page 1876 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-259
14Repair the open circuit or high resistance on the
ignition voltage feed circuit between the Meter
(10A) fuse and the IP cluster (pin 8 of B-24).
Did you

Page 1877 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-260 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
DTC P2100, P2101 or P2103 (Flash Code 446)
Circuit Description
The ECM controls the intake throttle valve opening
based on the engine running condition and

6E-260 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
DTC P2100, P2101 or P2103 (Flash Code 446)
Circuit Description
The ECM controls the intake throttle valve opening
based on the engine running condition and by
controlling the intake throttle solenoid. The intake
throttle valve position is detected by the position
sensor, and relayed to the ECM. If the ECM detects an
open circuit or short circuit on the solenoid circuits,
DTC P2100, P2101 or P2103 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 an open circuit on the intake throttle solenoid circuits. (DTC P2100)
• The ECM detects a short to ground on the intake throttle solenoid circuits. (DTC P2101)
• The ECM detects a short to voltage circuit on the intake throttle solenoid circuits. (DTC P2103)
Action Taken When the DTC Sets • The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs
and fails. Refer to DTC Type Definitions for Action
Taken When the DTC Sets - Type B. (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 inhibits EGR control.
Condition for Clearing the DTC • Refer to DTC Type Definitions for Condition for Clearing the MIL/ DTC - Type B (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: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P2100, P2101 or P2103
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 intake throttle valve harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Connect a DMM between the drive voltage circuit (pin 2 of E-38) and a known good
ground.
5. Connect a DMM between the low side circuit (pin 1 of E-38) and a known good ground.
Are both voltage readings within the specified
value? 1.4 to 1.8 volts
Go to Step 5 Go to Step 4
4 Is the DMM voltage more than the specified value
at Step 3? —
Go to Step 7 Go to Step 6

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Page 1878 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-261
51. Test the circuits between the ECM (pins 55
and 56 of E-90) and the intake throttle valve
(pins 1 and 2 of E-38) for a short circuit each
other.
2. Repai

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-261
51. Test the circuits between the ECM (pins 55
and 56 of E-90) and the intake throttle valve
(pins 1 and 2 of E-38) for a short circuit each
other.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 8
6 1. Test the circuits (which ever voltage reading
did not read within the specified value at Step
3) between the ECM (pins 55 and 56 of E-90)
and the intake throttle valve (pins 1 and 2 of E-
38) for the following conditions:
• An open circuit
• A short to ground
• A short to the position sensor low reference circuit
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 9
7 1. Test the circuits (which ever voltage reading
did not read within the specified value at Step
3) between the ECM (pins 55 and 56 of E-90)
and the intake throttle valve (pins 1 and 2 of E-
38) 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 12 Go to Step 11
8 1. Inspect for an intermittent and for poor
connections at the harness connector of the
intake throttle valve (pins 1 and 2 of E-38).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 10
9 1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for poor connections at the harness connector of the
ECM (pins 55 and 56 of E-90).
4. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 12 Go to Step 11
10 Replace the intake throttle valve. Refer to Intake
Throttle Valve Replacement.
Did you complete the replacement? —
Go to Step 10
—
11Important:
Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement? —
Go to Step 12
—
Step Action Value(s)Yes No

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Page 1879 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E-262 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
121. 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

Page 1880 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-263
DTC P2122 or P2123 (Flash Code 121)
Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal control assembly.
T

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-263
DTC P2122 or P2123 (Flash Code 121)
Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal control assembly.
The sensor is made up of three individual sensors
within one housing. The ECM uses the APP sensors to
determine the amount of acceleration or deceleration
that is desired. The APP sensor 1 has the following
circuits.
• 5 volts reference circuit
• Low reference circuit
• APP sensor 1 signal circuit
The APP sensor 1 provides a signal to the ECM on the
signal circuit, which is relative to the position changes
of the accelerator pedal angle. If the ECM detects an
excessively low or high signal voltage, DTC P2122 or
P2123 will set.
Condition for Running the DTC • DTCs P0642 and P0643 are not set.
• The battery voltage is more than 9 volts.
• The ignition switch is ON.
Condition for Setting the DTC • The ECM detects that the APP sensor 1 signal voltage is less than 0.15 volts. (DTC P2122)
• The ECM detects that the APP sensor 1 signal voltage is more than 4.85 volts. (DTC P2123) 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
• The ECM inhibits cruise control.
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.
• APP sensor 1 may have an intermittent open somewhere in the pedal range.
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC P2122
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 P0642 also set? —
Go to DTC P0642 Go to Step 3
3 Fully depress and release the accelerator pedal
while observing the Accelerator Pedal Position
(APP) Sensor 1 parameter with a scan tool.
Does the scan tool indicate less than the specified
value during depressing or releasing the pedal? 0.2 volts
Go to Step 4 Go to Diagnostic
Aids

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