2010 Cadillac CTS Sedan AWD V6-3.0L Page 1537
Circuit/System Verification
1. Observe the DTC information with a scan tool. DTC P0601, P0602, P0603, P0604, P0606, P0607, P0610, P062B, P062F, P0630, P16F3, or
P2610 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Test the voltage and ground inputs to the K20 ECM for the following:
* A short
* An open
* High resistance
2. Ignition ON, observe the DTC information with a scan tool.
瀚慖f DTC P0602, P0610, or P0630 failed this ignition, program the K20 ECM. If the DTC resets, replace the K20 ECM.
3. Observe the DTC information with a scan tool. DTC P0601, P0603, P0604, P0606, P0607, P062B, P062F, P16F3, or P2610 should not set.
瀚慖f a DTC failed this ignition, replace the K20 ECM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and
programming
With Y41
DTC P0633 (with Y41)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0633
- Theft Deterrent Key Not Programmed
Circuit/System Description
When learning the prerelease password, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode.
DTC P0633 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the password and
challenge/response are learned, learn mode will be exited when the engine is successfully started. If the ECM does not exit learn mode, P0633 will
remain current and indicate a fault.
Conditions for Running the DTC
The ECM is in learn mode.
Conditions for Setting the DTC
DTC P0633 will set any time the ECM enters learn mode.
Action Taken When the DTC Sets
The security indicator will illuminate.
Conditions for Clearing the DTC
