U010CLOST COMMUNICATION WITH TURBOCHARGERSUPERCHARGER CONTROL MODULE FOR A
U010CLOST COMMUNICATION WITH TURBOCHARGERSUPERCHARGER CONTROL MODULE FOR A
U010C-LOST
COMMUNICATION WITH TURBOCHARGER/SUPERCHARGER CONTROL MODULE
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Variable Geometry Turbocharger (VGT) is electronically activated by the Turbo Actuator. The Turbo Actuator is a smart device that receives information via the J1939 Datalink from the Powertrain Control Module (PCM). The Turbo Actuator performs its own diagnostics and reports failures back to the PCM over the J1939 Datalink.
When Monitored:
Ignition on.
Set Condition:
The Powertrain Control Module (PCM) does not receive a message from the Turbo Actuator in a calibrated amount of time.
Possible Causes |
|
POWER SUPPLY TO TURBO ACTUATOR OPEN |
|
POWER SUPPLY TO TURBO ACTUATOR SHORTED TO GROUND |
|
SIGNAL CIRCUIT FROM TURBO ACTUATOR OPEN |
|
J1939 DATALINK (+) CIRCUIT OPEN |
|
J1939 DATALINK (-) CIRCUIT OPEN |
|
J1939 DATALINK (+) CIRCUIT SHORTED TO GROUND |
|
J1939 DATALINK (-) CIRCUIT SHORTED TO GROUND |
|
J1939 DATALINK (+) CIRCUIT SHORTED TO ANOTHER CIRCUIT |
|
J1939 DATALINK (-) CIRCUIT SHORTED TO ANOTHER CIRCUIT |
|
J1939 DATALINK COMPONENT INTERNALLY SHORTED |
|
TURBOCHARGER ACTUATOR ASSEMBLY |
|
POWERTRAIN CONTROL MODULE (PCM) |
1.U010C ACTIVE
Is
DTC U010C Active?
Yes
Go To 2
No
Perform the INTERMITTENT CONDITION diagnostic procedure.
2.OTHER DTCS
|
NOTE: |
Repair any Voltage Low DTCs before proceeding with this test procedure. |
|
NOTE: |
The J1939 Datalink is a BUS circuit which the PCM uses to communicate with the Turbo Actuator and O2 Sensor Module. If the J1939 Datalink is shorted or one of these components is internally shorted, communication will be lost and DTCs will set against BOTH of these components. |
Are
there lost communication DTCs present against BOTH of the components
listed in the note above?
Yes
Go To 5
No
Go To 3
3.CHECK THE POWER SUPPLY TO VGT ACTUATOR FOR AN OPEN
|
1. |
Turn the ignition off. |
|
2. |
Disconnect the Turbo Actuator harness connector. |
|
NOTE: |
Check connectors - Clean/repair as necessary. |
|
3. |
Ignition on, engine not running. |
|
4. |
Measure the voltage between the Turbo Actuator Power Supply circuit and the Turbo Actuator Return circuit at the Turbo Actuator harness connector. |
|
NOTE: |
Check the voltage at key-on and while cranking the engine. |
Is
the voltage above 11.0 Volts?
Yes
Go To 4
No
Repair/Replace the Smart Power Relay harness.
4.CHECK THE J1939 DATALINK FOR AN OPEN/HIGH RESISTANCE
|
1. |
Turn the ignition off. |
|
2. |
Disconnect the PCM C2 harness connector |
|
NOTE: |
Check connectors - Clean/repair as necessary. |
|
3. |
Measure the resistance of the J1939 Datalink (+) circuit between the Turbo Actuator harness connector and the PCM C2 harness connector. |
|
4. |
Measure the resistance of the J1939 Datalink (-) circuit between the Turbo Actuator harness connector and the PCM C2 harness connector. |
Is
the resistance below 5.0 Ohms for both measurements?
Yes
Replace the Turbocharger Actuator Assembly in accordance with the service information.
No
Repair the J1939 circuit that measured above 5.0 Ohms for an open or high resistance.
5.CHECK THE COMPONENTS ON THE J1939 DATALINK
|
NOTE: |
Disconnect only one component at a time during this next step. If the DTCs for the component that is STILL CONNECTED changes from active to stored, the component that was disconnected is faulty. If all of the DTCs remain active, then the disconnected component is not the problem. Reconnect each component before going on to the next one so that only one component is disconnected at a time. |
|
1. |
Turn the ignition off. |
|
2. |
Disconnect the Smart O2 Sensor Module harness connector. Cycle the ignition key on and off three times ending with the ignition on. Leave the ignition in the off position for 75 seconds each time. |
|
NOTE: |
Monitor the status of the DTCs for the remaining connected components with the scan tool. |
|
3. |
Turn the ignition off and reconnect the Turbo Actuator harness connector. |
|
4. |
Disconnect the Turbo Actuator harness connector. Cycle the ignition key on and off three times ending with the ignition on. Leave the ignition in the off position for 75 seconds each time. |
|
NOTE: |
Monitor the status of the DTCs for the remaining connected components with the scan tool. |
Did
the status of the DTCs change to stored for the component STILL
CONNECTED when disconnecting any one of the components listed
above?
Yes
Replace the component that caused the DTC change from active to stored in accordance with the service information.
No
Go To 6
6.CHECK THE J1939 DATALINK FOR A SHORT TO GROUND
|
1. |
Turn the ignition off. |
|
2. |
Disconnect the Turbo Actuator, Smart O2 Sensor Module and the PCM C2 harness connectors. |
|
3. |
Measure the resistance between ground and the J1939 Datalink (+) circuit at the PCM C2 harness connector. |
|
4. |
Measure the resistance between ground and the J1939 Datalink (-) circuit at the PCM C2 harness connector. |
Is
the resistance above 10k Ohms for both circuits?
Yes
Go To 7
No
Repair the J1939 circuit for a short to ground.
7.CHECK THE J1939 DATALINK FOR A SHORT
|
1. |
Measure the resistance between the J1939 Datalink (+) circuit at the PCM C2 harness connector and all other circuits in the PCM C2 harness connector. |
|
2. |
Measure the resistance between the J1939 Datalink (-) circuit at the PCM C2 harness connector and all other circuits in the PCM C2 harness connector. |
|
NOTE: |
Disregard any resistance between 50 and 70 Ohms between the J1939 (+) and the J1939 Datalink (-) pins. |
Is
the resistance above 10k Ohms?
Yes
Go To 8
No
Repair
the J1939 circuit for a short circuit.
8.CHECK THE J1939 DATALINK CIRCUITS FOR AN OPEN/HIGH RESISTANCE
|
1. |
Measure the resistance of the J1939 Datalink (+) circuit between the Turbo Actuator harness connector and the PCM C2 harness connector. |
|
2. |
Measure the resistance of the J1939 Datalink (-) circuit between the Turbo Actuator harness connector and the PCM C2 harness connector. |
Is
the resistance below 5.0 Ohms for both circuits?
Yes
Replace the Powertrain Control Module in accordance with the service information.
No
Repair the J1939 circuit for an open or high resistance.
Tags: communication with, lost communication, control, u010clost, communication, module, turbochargersupercharger
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