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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Control System & Fuel System - 3.6L - DTC P0135 To P0420) >> DTC P0261, P0264, P0267, P0270, P0273, or P0276 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 2:  This step determines if the condition is current.
  2. 3:  This step determines if the ignition 1 voltage supply circuit is shorted to ground. The fuel injectors for each bank of the engine are fused separately. If the circuit is shorted to ground, all the injector low voltage DTCs will set for one bank of the engine.
  3. 5:  This step isolates if the short to ground condition is on the injector side of the multi-way harness connector or the ECM side of the multi-way harness connector. If a low voltage DTC sets, the short to ground condition is between the multi-way harness connector and the ECM.
  4. 7:  This step isolates the condition. If the test lamp illuminates the injector control circuit is shorted to ground between the multi-way harness connector and the fuel injectors.
DTC P0261, P0264, P0267, P0270, P0273, or P0276

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Clear the DTCs with a scan tool.
  3. Start the engine.
  4. Observe the DTC Info with a scan tool.
Is DTC P0261, P0264, P0267, P0270, P0273, or P0276 set?		 Go to Step 3  Go to Step 4 
3  Are DTCs P0261, P0267, and P0273 set at the same time, or are DTCs P0264, P0270, and P0276 set at the same time? Go to Step 7  Go to Step 5 
4
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 4  Go to Diagnostic Aids
5 
  1. Turn OFF the ignition.
    2. IMPORTANT: Disconnecting the multi-way harness connector causes P0201-P0206 fuel injector circuit open DTCs to set.
  2. Disconnect the fuel injector multi-way harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Clear the DTCs with a scan tool.
  5. Attempt to start the engine.
  6. Observe the DTC Info with a scan tool.
Is DTC P0261, P0264, P0267, P0270, P0273, or P0276 set?		 Go to Step 6  Go to Step 10 
6 Test the control circuit of the appropriate fuel injector for a short to ground between the multi-way connector and the engine control module (ECM). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 11 
7 
  1. Turn OFF the ignition.
  2. Disconnect the fuel injector multi-way harness connector.
  3. Probe the appropriate ignition 1 voltage supply circuit, fuel injector side of harness, with a test lamp connected to B+.
Does the test lamp illuminate?		 Go to Step 8  Go to Step 9 
8
  1. Remove the upper intake. Refer to Upper Intake Manifold Replacement in Engine Mechanical - 3.6L (LY7).
  2. Repair the appropriate ignition 1 voltage supply circuit of the fuel injector for a short to ground between the multi-way connector and the fuel injectors. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  3. Replace the fuse as necessary.
Did you complete the repair?		 Go to Step 12  -
9
  1. Repair the ignition 1 voltage supply circuit of the fuel injector for a short to ground between the multi-way connector and the fuse. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  2. Replace the fuse as necessary.
Did you complete the repair?		 Go to Step 12  -
10
  1. Remove the upper intake. Refer to Upper Intake Manifold Replacement in Engine Mechanical - 3.6L (LY7).
  2. Repair the appropriate control circuit of the fuel injector for a short to ground between the multi-way connector and the fuel injector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 12  -
11 Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 12  -
12
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 2  Go to Step 13 
13 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
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