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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls - 2.6L & 3.2L - Diagnosis (DTC P0449 - P2010)) >> Diagnostic Trouble Codes >> DTC P0660 >> 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:  Listen for an audible click when the intake manifold tuning (IMT) solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 4:  Tests for voltage at the coil side of the IMT solenoid. The manifold fuse supplies power to the coil side of the IMT solenoid.
  3. 5:  Verifies that the ECM is providing ground to the IMT solenoid.
  4. 6:  Tests if ground is constantly being applied to the IMT solenoid.
DTC P0660

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 
  1. Turn ON the ignition, with the engine OFF.
  2. Command the intake manifold tuning (IMT) solenoid ON and OFF with a scan tool.
Does the IMT solenoid click with each command?		 Go to Step 3  Go to Step 4 
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 as specified in the supporting text, or as close to the Freeze Frame/Failure Records that you observed.
Does the DTC fail this ignition?		 Go to Step 4  Go to Intermittent Conditions
4 
  1. Turn OFF the ignition.
  2. Disconnect the IMT solenoid.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery voltage circuit of the IMT solenoid with a test lamp that is connected to a good ground.
Does the test lamp turn ON?		 Go to Step 5  Go to Step 11 
5 
  1. Connect a test lamp between the control circuit of the IMT solenoid and the battery voltage circuit of the IMT solenoid.
  2. Command the IMT solenoid ON and OFF with a scan tool.
Does the test lamp turn ON and OFF?		 Go to Step 9  Go to Step 6 
6  Does the test lamp remain ON with each command? Go to Step 8  Go to Step 7 
7 Test the control circuit of the IMT solenoid for an open or high resistance.
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
8 Test the control circuit of the IMT solenoid for a short to ground.
Did you find and correct the condition?		 Go to Step 14  Go to Step 10 
9 Inspect for poor connections at the IMT solenoid.
Did you find and correct the condition?		 Go to Step 14  Go to Step 12 
10 Inspect for poor connections at the harness connector of the engine control module (ECM).
Did you find and correct the condition?		 Go to Step 14  Go to Step 13 
11 Test the positive voltage circuit of the IMT solenoid for an open, high resistance or short to ground. Repair as necessary.
Did you complete the repair?		 Go to Step 14  -
12 Replace the IMT solenoid. Refer to Intake Resonance Switchover Solenoid Replacement .
Did you complete the replacement?		 Go to Step 14  -
13 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 Go to Step 14  -
14
  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 as specified in the supporting text.
Does the DTC run and pass?		 Go to Step 15  Go to Step 2 
15 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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