1A-248 Engine Control System (4HK1)
DTC P161B (Flash Code 179)
Circuit Description
The ECM communicates with the immobilizer control
unit (ICU) to execute immobilizer function. 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. (Euro
2 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. (Euro 2
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, U0073 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?
—
Go to Applicable
DTC for immobilizer
in Section 9I
Security and Lock Go to Step 4
4
Program immobilizer security information into the
ECM. Refer to Immobilizer Control Unit &
Programming in Section 9I Security and Lock in
this 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
—
LG4HKED-WE-0871.book 248 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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