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Home >> Saturn >> 2002 >> LW300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 314 (Automatic Transaxle - 4T40-E/4T45-E - Diagnosis (DTC P0218 To DTC P0717)) >> Diagnostic Trouble Codes >> DTC P0602 (3.0L (L81)) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  This step eliminates the TCM software as a possible cause of the DTC. If the DTC continues to set after reprogramming, the fault is in the TCM hardware.
DTC P0602 (3.0L (L81))

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Self-Diagnostics - 3.0L or DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Self-Diagnostics - 2.2L
2
  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
    IMPORTANT:
    • Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from both the ECM and the TCM.
    • Record the DTC Freeze Frame and Failure Records.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Turn OFF the ignition for at least 30 seconds.
  6. Turn ON the ignition.
Did DTC P0602 reset?		 - Go to Step 3  Go to Diagnostic Aids
3  Perform the Transmission Control Module Reprogramming Procedure.
Refer to SERVICE PROGRAMMING SYSTEM (SPS) in Programming
Did the DTC P0602 reset?		 - Go to Step 4  Go to Step 5 
4 Replace the TCM.
Refer to Transmission Control Module (TCM) Replacement
Is the replacement complete?		 - Go to Step 5  -
5 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Turn OFF the ignition for at least 30 seconds.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
  5. Select Specific DTC.
  6. Enter DTC P0602.

Has the test run and passed?		 - Go to Step 6  Go to Step 2 
6 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 TESTS in Self-Diagnostics - 2.2L or DIAGNOSTIC TESTS in Self-Diagnostics - 3.0L System OK
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