Regal L4-20L Turbo (2011) Powertrain Management - Component Information
Reference Information
Schematic Reference
Data Communication Schematics (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Data Link Communications Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Connector
Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Circuit/System Testing
Note: Use the schematic to identify the following:
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Control modules the vehicle is equipped with
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Control module and splice pack locations on the low speed GMLAN serial data circuit
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The low speed GMLAN serial data circuit terminals for each control module, component, or splice pack
1. Attempt to communicate with all control modules on the low speed GMLAN serial data circuit. Refer to Data Link References (See: Initial
Inspection and Diagnostic Overview). Communications should not be available with two or more control modules on the low speed GMLAN
serial data circuit.
‹› If only one control module is not communicating, diagnose that control module only. Refer to DTC U0100-U02FF (See: Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures/U Code Charts/U0100).
‹› If one or more control modules are communicating but not all, refer to Testing the Serial Data Circuit for an Open/High Resistance.
2. Disconnect the scan tool from the DLC. The following tests will be done at the DLC connector.
3. All access doors closed, ignition OFF for 60 seconds, test for less than 10 ohm between the ground circuit terminal 5 and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, test for less than 4.5 V between the serial data circuit terminal 1 and ground.
‹› If greater than the specified range, test the serial data circuit for a short to voltage. Refer to Testing the Serial Data Circuit for a Short to
Voltage.
5. Ignition OFF for 60 seconds, test for greater than 100 ohm between the serial data circuit terminal 1 and ground.
‹› If less than the specified range, test the serial data circuit for a short to ground. Refer to Testing the Serial Data Circuits for a Short to ground.
6. Disconnect the harness connector at the first splice pack closest in the circuit to the DLC.
7. Test for less than 2 ohm between the DLC serial data circuit terminal 1 and the splice pack connector serial data input terminal.
‹› If greater than the specified range, test the serial data circuit for an open/high resistance. If the circuit tests normal, replace the splice pack.
Testing the Serial Data Circuits for a Short to Voltage
1. Ignition OFF, disconnect the appropriate harness connectors at the following components:
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All low speed serial data splice packs
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Any module or component between that may be between the splice packs
2. Ignition ON, test for less than 4.5 V between the DLC serial data circuit terminal 1 and ground.
‹› If greater than the specified range, repair the short to voltage.
