Engine Control System (4HK1) 1A-315
DTC U0110 (Flash Code 87)
Circuit Description
The ECM and the variable nozzle turbocharger (VNT)
control module communicate control and diagnostic
information via a controller area network (CAN)
communication bus. The ECM monitors CAN
operational status by expecting a constant flow of
messages from each module. If the ECM fails to send
or receive an expected message from the VNT control
module, this DTC will set.
Condition for Running the DTC
Error Message DTC
• The battery voltage is between 20 to 32 volts.
• The ignition switch is ON.
Lost Communication DTC
• DTC U0073 is not set
• The battery voltage is more than 20 volts.
• The ignition switch is ON.
Condition for Setting the DTC
Error Message DTC
• The VNT control module received an error CAN
Bus messages from the ECM.
Lost Communication DTC
• The ECM detects that the CAN Bus messages
from the VNT control module are not being
received.
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.
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.
Schematic Reference:
Engine Controls Schematics
Connector End View Reference:
Engine Controls
Connector End Views or ECM Connector End Views
Circuit/ System Testing DTC U0110
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 U0073 or P0045 also set?
—
Go to Applicable
DTC
Go to Step 3
3
1.
Turn OFF the ignition.
2.
Disconnect the variable nozzle turbocharger
(VNT) control module harness connector.
3.
Measure the resistance across the CAN Low
and High circuits (pins 15 and 16 of E-4).
Is the resistance within the specified value
(parallel resistance of the 120
Ω
resistor in the
ECM and the IP cluster should be 60
Ω
)?
50 to 70
Ω
Go to Step 8
Go to Step 4
4
1.
Leave the DMM connected to the VNT control
module harness connector.
2.
Disconnect the IP cluster harness connector.
Is the resistance within the specified value?
110 to 130
Ω
Go to Step 5
Go to Step 6
5
Measure the resistance of the IP cluster (pins 13
and 14 of B-105).
Is the resistance within the specified value?
110 to 130
Ω
Go to Step 7
Go to Step 14
LG4HKED-WE-0871.book 315
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