Dtc U0167 (Flash Code 177) - Isuzu 2008MY N Series Workshop Manual

1A-318 Engine Control System (4HK1)

DTC U0167 (Flash Code 177)

Circuit Description
The ECM communicates with the immobilizer control
unit (ICU) to execute immobilizer function. If the ECM
does not detect a response signal from the ICU, this
DTC will set.
Condition for Setting the DTC
• The ECM does not receive an 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. (Euro
2 specification)
Circuit/ System Testing DTC U0167
Step
Did you perform the Diagnostic System Check
1
- Engine Controls?
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
2
4. Monitor the DTC Information with a scan tool.
Is DTC U0073 also set?
Attempt to communicate with the immobilizer
control unit (ICU) via the Immobilizer Data table.
3
Does the scan tool communicate with the
ICU?
Monitor the immobilizer DTC Information with a
scan tool.
4
Does the immobilizer DTCs fail this ignition?
Important:
programmed and learned.
5
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
6
3. Turn ON the ignition, with the engine OFF.
Did the DTC fail this ignition?
Observe the DTC Information with a scan tool.
7
Are there any DTCs that you have not
diagnosed?
Action
Replacement ECM
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. (Euro 2
specification)
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
• Electromagnetic
intermittent condition.
• Any communication fault with the ICU may set this
DTC.
Value(s)
—
—
—
—
must be
—
—
—
interference
Yes
Go to Step 2
Go to DTC U0073
Controls in Section
Go to Step 4 9I Security and Lock
Go to Applicable
DTC for Immobilizer
in Section 9I
Security and Lock
Go to Step 6
Go to Step 2
Go to DTC List
may affect
No
Go to Diagnostic
System Check -
Engine Controls
Go to Step 3
Go to Diagnostic
System Check -
Immobilizer
Go to Step 5
—
Go to Step 7
System OK