Isuzu KB P190. Manual — part 467
ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-251
Circuit/ System Testing DTC P156B
5
1.
Turn OFF the ignition.
2.
Disconnect the ECM harness connector.
3.
Inspect for an intermittent, for a poor
connection and for corrosion at the harness
connector of the ECM (pin 73 of C-58).
4.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 6
Go to Diagnostic
Aids
6
1.
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 and let idle.
5.
Load the electrical system by turning ON the
headlights, A/C, etc. while observing the
Battery Voltage parameter with a scan tool.
Does the scan tool indicate more than the specified
value?
10.0 volts
Go to Step 7
Go to Step 3
7
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
Was the vehicle recently jump started or a battery
charger placed on the battery?
—
Go to Step 7
Go to Step 3
3
1.
Install a scan tool.
2.
Start the engine and let idle.
3.
Observe the Battery Voltage parameter with
the scan tool.
Does the scan tool indicate less than the specified
value?
16.0 volts
Go to Diagnostic
Aids
Go to Step 4
4
Test the charging system. Refer to Diagnosis of
The Charging System in the Charging System
Section.
Did you find a charging system problem?
—
Go to Step 5
Go to Diagnostic
Aids
5
Repair the charging system. Refer to Diagnosis of
The Charging System in the Charging System
Section.
Did you complete the repair?
—
Go to Step 6
—
6E-252 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
6
1.
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 and let idle.
5.
Observe the Battery Voltage parameter with a
scan tool.
Does the scan tool indicate less than the specified
value?
16.0 volts
Go to Step 7
Go to Step 4
7
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
ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-253
DTC P161B (Flash Code 179)
Circuit Description
The ECM communicates with the immobilizer control
unit (ICU) to execute immobilizer function. The ECM
transmits a specific request signal to the ICU and the
ICU sends back a response signal to the ECM. Both
communication signals are carried out via a controller
area network (CAN) communication bus. If the ECM
receives a wrong response signal from the ICU, this
DTC will set.
Condition for Setting the DTC
• The ECM receives a wrong immobilizer response
signal from the ICU.
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)
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.
• Electromagnetic interference may affect
intermittent condition.
Circuit/ System Testing DTC P161B
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.
Is DTC P0633, U0001 or U0167 also set?
—
Go to Applicable
DTC
Go to Step 3
3
Monitor the immobilizer DTC Information with a
scan tool.
Does the immobilizer DTCs fail this ignition which
begin with B or U?
—
Go to Applicable
DTC in Immobilizer
Section
Go to Step 4
4
Program immobilizer security information into the
ECM. Refer to Resetting and Programming
Guidelines in immobilizer section.
Did you find and correct the condition?
—
Go to Step 6
Go to Step 5
5
Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
—
Go to Step 6
—
6E-254 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
6
1.
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 2
Go to Step 7
7
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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