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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Automatic Transmission - 5L40-E (DTC P0748 To P1832)) >> Automatic Transaxle Diagnosis >> DTC P0979 >> Test Description

Test Description

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

The number below refers to the step number on the diagnostic table.

  1. 2:  Listen for an audible click when the solenoid energizes.
DTC P0979

Step Action Value(s) Yes No
1 Did you perform the Diagnostic System Check - Automatic Transmission? - Go to Step 2  Go to Diagnostic System Check - Automatic Transmission
2 
  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
    3. IMPORTANT:
    • Before clearing the DTC, use the scan tool in order to record the ECM Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and the TCM.
    • Using the Clear Info function erases stored DTCs in both the ECM and TCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Use the scan tool in order to command the 4-5 shift solenoid ON.
Does the solenoid operate?		 - Go to Step 9  Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the AT 20-way inline harness connector.
  3. Install the J 45681  jumper harness to the TCM side of the 20-way connector.
  4. Turn ON the ignition with the engine OFF.
  5. With the test lamp connected to ground, probe the solenoid supply voltage circuit of the J 45681  .
Does the test lamp illuminate?		 - Go to Step 4  Go to Step 7 
4
  1. Turn OFF the ignition.
  2. Install the J 45681  to the transmission side of the 20-way connector.
  3. Using the DMM, measure the resistance between the solenoid supply voltage circuit and the 4-5 SS valve control circuit of the J 45681  .

    Refer to Component Resistance .

Is the resistance within the specified range?		 15.0-20.3Ω Go to Step 5  Go to Step 8 
5 Using the DMM, measure the resistance between the solenoid supply voltage circuit of the J 45681  and ground.
Is the resistance greater than the specified value?		 50K Ω Go to Step 6  Go to Step 8 
6
  1. Disconnect the TCM.
  2. Test the 4-5 SS valve control circuit for the following conditions:
Did you find a condition?		 - Go to Step 10  Go to Step 9 
7
  1. Turn OFF the ignition.
  2. Disconnect the TCM.
  3. Test the HSD2 circuit from the TCM to the 4-5 SS valve control circuit for an open circuit. Refer to Testing for Continuity in Wiring Systems.
Did you find a condition?		 - Go to Step 10  Go to Step 9 
8
  1. Remove the transmission oil pan.
  2. Test the 4-5 shift solenoid wiring from the 20-way connector to the 4-5 shift solenoid connector for the following conditions:
Did you find a condition?		 - Go to Step 11  Go to Step 12 
9 Replace the TCM. Refer to Transmission Control Module (TCM) Replacement .
Is the action complete?		 - Go to Step 13  -
10 Perform the necessary wiring repairs. Refer to Wiring Repairs in Wiring Systems.
Is the action complete?		 - Go to Step 13  -
11 Replace the AT internal transmission wiring harness. Refer to Transmission Internal Electrical Harness Replacement .
Is the action complete?		 - Go to Step 13  -
12 Replace the 4-5 shift solenoid valve. Refer to 4-5 Shift Solenoid Replacement .
Is the action complete?		 - Go to Step 13  -
13 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Turn ON the ignition, with the engine OFF.
  4. Select Specific DTC.
  5. Enter DTC P0979.

Has the test run and passed?		 - Go to Step 14  Go to Step 2 
14 With the scan tool, observe the stored information, capture info and DTC info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.6L and 3.2L or Diagnostic Trouble Code (DTC) List in Engine Controls - 3.6L (LY7) System OK
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