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Home >> Cadillac >> 2004 >> CTS Base, 3.6 7 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Manual Transmission - M35) >> Diagnostic Information and Procedures >> Diagnostic System Check - Manual Transmission >> 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:  Lack of communication may be because of a partial or a total malfunction of the keyword dataline.
  2. 5:  This step stores the engine control module (ECM) diagnostic trouble code (DTC) information into the scan tools memory. After you complete the diagnostic procedure, review the captured information in order to catch the next DTC if the control module stores multiple DTCs. Review the Freeze Frame data and the Failure Records data. Use this information in order to determine how frequently and how recently the DTC sets. This information may help diagnose an intermittent condition. Information about the operating conditions at the time that the DTC set may also help diagnose an intermittent condition. Capturing the stored information saves the data that the ECM loses during the following conditions:
    • When a diagnostic procedures instructs you to clear the DTCs.
    • When a diagnostic procedure instructs you to disconnect the ECM connectors.
    • When a diagnostic procedure instructs you to replace the ECM.
  3. 6:  The presence of DTCs which begin with "U", indicate that some other module is not communicating. Following the specified procedure will gather all the available information before you perform the tests.
  4. 8:  If there are other modules with DTCs set, refer to the DTC list. The DTC list directs you to the appropriate diagnostic procedure. If the control module stores multiple powertrain DTCs, diagnose the DTCs in the following order:
    • Component level DTCs, such as sensor DTCs, solenoid DTCs, and relay DTCs. Diagnose the multiple DTCs within this category in numerical order. Begin with the lowest numbered DTC, unless the diagnostic table directs you otherwise.
    • System level DTCs, for example, misfire DTCs, fuel trim DTCs, and catalyst DTCs.
  5. 10:  This step is for areas that have inspection and maintenance testing procedures for emissions testing. Use this step if the testing facility found one or more Inspection and Maintenance (I/M) system statuses that did not set.
Diagnostic System Check - Manual Transmission

Step Action Yes No
IMPORTANT:
  • DO NOT perform this diagnostic if there is not a driveability concern, unless another procedure directs you to this diagnostic.
  • Before you proceed with diagnosis, search for applicable service bulletins.
  • Unless a diagnostic procedure instructs you, DO NOT clear the DTCs.
  • If there is a condition with the starting system, refer to Diagnostic System Check - Engine Electrical in Engine Electrical.
  • Ensure the battery has a full charge.
  • Ensure the battery cables are clean and tight.
  • Ensure the ECM grounds are clean, tight, and in the correct location.
1 Install a scan tool.
Does the scan tool turn ON?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the ECM.
Does the scan tool communicate with the ECM?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Keyword Data Line in Data Link Communications
3 Attempt to start the engine.
Does the engine start and idle?		 Go to Step 4  Go to Engine Cranks but Does Not Run in Engine Controls - 2.6L and 3.2L
4 Select the DTC display function for the following control modules:
  • ECM
  • Instrument Panel Cluster (IPC)
  • Electronic Brake Control Module (EBCM)
  • Heating, Ventilation, and Air Conditioning (HVAC)

Does the scan tool display any DTCs?		 Go to Step 5  Go to Step 9 
5  With a scan tool, select Captured Info in order to store the powertrain DTC information.
Did you complete the action?		 Go to Step 6  -
6  Does the scan tool display DTCs which begin with a "U"? Go to Diagnostic Trouble Code (DTC) List in Data Link Communications Go to Step 7 
7 Does the scan tool display DTCs P0601, P0602, P0603, P0604, P0605, or P0606? Go to DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 Go to Step 8 
8  Does the scan tool display DTCs P0560, P0562, P0563, P0625, P0626, P2500, or P2501? Go to Diagnostic Trouble Code (DTC) List in Engine Electrical Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.6L and 3.2L
9 Is the customer's concern with Inspection and Maintenance (I/M) testing? Go to Inspection/Maintenance (I/M) System Check Go to Step 10 
10 
  1. Review the following symptoms.
  2. Refer to the applicable symptom diagnostic table:
Did you find and correct the condition?		 System OK Go to Intermittent Conditions in Engine Controls - 2.6L and 3.2L
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