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Home >> Cadillac >> 1993 >> Seville V8-281 4.6L >> Repair and Diagnosis >> Steering and Suspension >> Suspension >> Suspension Control ( Automatic - Electronic ) >> Testing and Inspection >> Reading and Clearing Diagnostic Trouble Codes >> Displaying and Reading Trouble Codes >> Without Scan Tool

Without Scan Tool

Diagnostic Flow:






Trouble Codes

The RSS Module continually monitors operating conditions for possible system malfunctions. By comparing system conditions against standard operating limits, certain circuit and component malfunctions can be detected. A four digit alpha-numeric Trouble Code is stored in computer memory when a problem is detected by this self-diagnostic system. These Trouble Codes can later be displayed by the service technician as an aid in system repair.

How to Enter Diagnostics

To enter diagnostics, proceed as follows:
1. Turn the ignition "ON".
2. Push the "OFF" and "WARM" buttons on the CCC simultaneously and hold until the segment check appears on the Instrument Panel Cluster (IPC).

NOTICE: Operating the vehicle in diagnostics for extended time periods without the engine running or without a battery charger will cause the battery to run down and possibly relate false diagnostic information, or cause a no start condition. To ensure proper operation, attach a battery charger, if vehicle is to be operated in diagnostics without engine running for periods longer than 1/2 hour.

Segment Check

The purpose of illuminating the IPC is verify all segments of the LED displays are working. The turn signal indicators do not light during this check. Further diagnosis should not be attempted unless all segments appear, as this could lead to misdiagnosis. If any portions or segments of the IPC displays are inoperative, the IPC must be replaced.

Trouble Code Display
After diagnostics is entered, any trouble codes stored in computer memory will be displayed. Codes may be stored for the PCM, IPC, Air Conditioning Programmer (ACP), SIR, TCS or RTD systems.

Each trouble code consists of the system abbreviation (P - Engine (PCM), I - IPC, A - ACP, R - SIR, T - TCS, or S - RTD), a three digit code identifier, and the letter C or H. All codes for each system are displayed together, in the order of there three digit number (lowest first - i.e. S010, S011, etc.). The final digit of the code, a "C" or an "H" is used to indicate wether the code is current or history. "C" means the fault was still present the last time the diagnostic test was run, while "H" means the failure was not present the last time the code was tested for.

If no codes are present for a system, a "NO X CODE" message (with X being the system i.e. P, I, A, R, T, or S) will be displayed. If the communication line to a component is not operating, a "NO X DATA" message will be displayed, indicating that the IPC could not communicate with that system.

At any time during the display of trouble codes, if the "AUTO" button on the IPC is depressed the system will exit "Service Mode" and go back to normal vehicle operation.


How to Operate Diagnostics

After trouble codes have been displayed, diagnostics can be used to perform several tests on different systems one at a time. Upon completion of code display, a specific system may be selected for testing. See Diagnostic Flow Diagrams.

Selecting the System

Following the display of trouble codes, the first available system will be displayed (i.e. PCM?). While selecting a system to test, any of the following actions may be taken to control the display:

1. Depressing the "HI" button on the CCC will select the displayed system for testing.

2. Depressing the "LO" button on the CCC will display the next available system selection. This allows the display to be stepped through all system choices. This list of systems can be repeated following the end of the system list.

3. Depressing the "OFF" button the CCC will stop the system selection process and return the display to the beginning of the trouble code sequence.

Selecting the Test Type

Having selected a system, the first available test type will be displayed (i.e. RTD DATA?). While selecting a specific test type, any of the following actions may be taken to control the display:

1. Depressing the "HI' button on the CCC will select the displayed test type. At this point the first of several specific tests will appear.

2. Depressing the "LO" button on the CCC will display the next available test type for the selected system. This allows the display to be stepped through all available test type choices. This list of test types can be repeated following the display of the last test type.

3. Depressing the "OFF" button on the CCC will stop the test type selection process and return the display to the next available system selection.

Selecting the Test

Selection of the "DATA?", "INPUTS?", "OUTPUTS?" or "OVERRIDE?" test types will result in the first available test being displayed. Four characters of the display will contain a test code to identify the selection. The first two characters are letters which identify the system and test type (i.e. SD for RTD DATA) and the last two characters numerically identify the test (i.e. SD01 for RF Accelerometer). While selecting a specific test, any of the following actions may be taken:

1. Depressing the "HI" button on the CCC will display the next larger test number for the selected test type. If this button is pressed with the highest test number displayed, the lowest test number will then appear.

2. Depressing the "LO" button on the CCC will display the next smaller test number for the selected test type. If this button is pressed with the lowest test number displayed, the highest test number will then appear.

3. Depressing the "OFF" button on the CCC will stop the test selection process and return the display to the next available test type for the selected system.
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