LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls - 3.6L - Diagnosis (DTC P0132 - P0393)) >> Diagnosis >> DTC P0262, P0265, P0268, P0271, P0274, or P0277 >> 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. 4:  This step tests for a short to voltage on the fuel injector control circuit. If the voltage is more than the specified value, the circuit is shorted to a voltage or there is an internal ECM condition.
  3. 6:  This step tests if the ignition 1 voltage supply circuit is shorted to the fuel injector control circuit.
DTC P0262, P0265, P0268, P0271, P0274, or P0277

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
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 P0262, P0265, P0268, P0271, P0274, or P0277 set?		 - Go to Step 4  Go to Step 3 
3
  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
4 
  1. Turn OFF the ignition.
  2. Disconnect the fuel injector multi-way harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage between the appropriate control circuit of the fuel injector, engine control module (ECM) side of harness, to the ECM housing with a DMM.
Is the voltage more than the specified value?		 4.6 V Go to Step 5  Go to Step 6 
5 Test the control circuit of the fuel injector for a short to voltage between the multi-way harness connector and the ECM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
6 
  1. Turn OFF the ignition.
  2. Remove the upper intake. Refer to Intake Manifold Replacement - Upper in Engine Mechanical - 3.6L (LY7).
  3. Disconnect the appropriate fuel injector.
  4. Measure the resistance between the control circuit of the fuel injector and the ignition 1 voltage supply circuit of the fuel injector with a DMM.
Does the DMM display OL?		 - Go to Step 8  Go to Step 7 
7 Repair the short between the ignition 1 voltage supply circuit to the control circuit of the fuel injector. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 10  -
8 Replace the appropriate fuel injector. Refer to Fuel Injectors and Fuel Rail Replacement .
Did you complete the replacement?		 - Go to Step 10  -
9 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 10  -
10
  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 11 
11 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
scientia non olet · About LEMON Manuals