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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 667 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U1300, U1301, or U1305 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  If you can communicate with the PCM, the malfunction may be an intermittent short to voltage or ground in the wiring of the class 2 serial data circuit.
  2. 5:  If there are no current DTCs that begin with a "U", the communication malfunction has been repaired.
  3. 6:  The communication malfunction may have prevented diagnosis of the customer complaint.
DTC U1300, U1301, or U1305

Step Action Yes No
Schematic Reference: Data Communication Schematics 
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK - VEHICLE
2
  1. Turn ON the ignition, with the engine OFF.
  2. Using a scan tool, attempt to communicate with the powertrain control module (PCM).
Can you communicate with the PCM?		 Go to Step 4  Go to Scan Tool Does Not Communicate with Class 2 Device 
3 
IMPORTANT: Turn ON the ignition, with the engine OFF, when testing for a short to voltage. Use the DMM MIN/MAX function to capture intermittent conditions.
Test the class 2 serial data circuit for an intermittent short to ground or an intermittent short to voltage. Refer to the following:Did you find and correct the condition?		 Go to Step 5  Go to Step 4 
4
IMPORTANT: Perform the module setup procedure, if required.
Replace the PCM. Refer to Control Module References for the appropriate repair instructions.Did you complete the replacement?		 Go to Step 5  -
5 
  1. Reconnect all of the disconnected modules.
  2. Reconnect any other disconnected connectors.
  3. Install a scan tool.
  4. Turn ON the ignition, with the engine OFF.
  5. Retrieve DTCs using the Vehicle DTC Information feature on the scan tool, under the Computer/Integrating System menu.
Did you record any DTCs which begin with a "U" and with a current status?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 6 
6  Did you record any DTCs which do not begin with a "U"? Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 7 
7 Did you diagnose all of the DTCs? Go to Step 8  Go to Step 5 
8 Use the scan tool in order to clear the DTCs.
Did you complete the action?		 System OK -
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