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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls - 2.6L & 3.2L - Diagnosis (DTC P0172 - P0446)) >> Diagnostic Trouble Codes >> DTC P0201-P0206 >> 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 verifies that the condition is present.
  2. 4:  This step verifies that the ECM is able to control the fuel injector. If the test lamp flashes, the control module and the wiring are OK.
  3. 5:  This step isolates the circuit between the multi-way connector and the control module. An open on the fuel injector control circuit will not allow the test lamp to flash.
  4. 7:  This step inspects for fuel injector harness damage between the multi-way connector and the intake plenum. Careful inspection may isolate the condition before removal of the intake plenum.
DTC P0201-P0206

Step Action 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 
IMPORTANT: If DTCs P0201-206 are all set, inspect the ignition 1 voltage supply circuit for an open between the underhood bussed electrical center (UBEC) and the splice.
  1. Clear the DTCs with a scan tool.
  2. Crank the engine or start the engine.
Does a fuel injector DTC set?		 Go to Step 4  Go to Step 3 
3
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Crank the engine or 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 harness multi-way connector.
  3. Probe the appropriate fuel injector control circuit, ECM side, with a test lamp connected to B+.
  4. Crank the engine.
Does the test lamp flash while cranking the engine?		 Go to Step 6  Go to Step 5 
5  Test the control circuit of the affected fuel injector for an open between the multi-way connector and the ECM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 16  Go to Step 12 
6
  1. Turn ON the ignition, with the engine OFF.
  2. Probe the ignition 1 voltage supply circuit at the fuel injector harness multi-way connector with a test lamp connected to a good ground.
Does the test lamp illuminate?		 Go to Step 7  Go to Step 13 
7 
  1. Inspect the accessible fuel injector jumper harness between the multi-way connector and the intake plenum for the following:
    • Poor connections at the multi-way connector
    • Damaged or pinched wiring
    • Broken wires inside the insulation
  2. Repair as necessary. Refer to Wiring Repairs and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 16  Go to Step 8 
8 Test for continuity between the ignition 1 voltage supply and the affected fuel injector control circuit, fuel injector side, at the multi-way connector with the DMM. Refer to Testing for Continuity in Wiring Systems.
Does the DMM indicate OL?		 Go to Step 9  Go to Step 11 
9 Test the control circuit of the fuel injector for an open between the multi-way connector and the fuel injector connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 16  Go to Step 10 
10 Test the ignition 1 voltage supply circuit of the affected fuel injector for an open between the fuel injector and the splice. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 16  Go to Step 11 
11 Test for an intermittent and for a poor connection at the fuel injector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 16  Go to Step 14 
12 Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 16  Go to Step 15 
13 Repair the open in the ignition 1 voltage supply circuit of the fuel injector. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 16  -
14 Replace the affected fuel injector. Refer to Fuel Injectors and Fuel Rail Replacement .
Did you complete the replacement?		 Go to Step 16  -
15 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 Go to Step 16  -
16
  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 17 
17 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
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