1988 Cadillac Allante SYSTEM FAULT

Tiny
WEISTART
  • MEMBER
  • 1988 CADILLAC ALLANTE
  • V8
  • 2WD
  • AUTOMATIC
  • 40,000 MILES
SYSTEM FAULT SHOWS UP ON MESSAGE BAR AND I CANNOT GET RID OF IT TO SEE WHAT IS WRONG.
THE FAN NO 1 WAS NOT RUNNING AND THE COOLING FAN FAULT SHOWED ON THE MESSAGE BAR. WE TRIED TO JUMP THE COOLANT FAN RELAY AND THE MESSAGE BAR WENT DARK. WITH THE KEY TURNED ON THE SYSTEM FAULT SHOWS AND THE INSTRUMENT PANEL COMES ON WITH MILEAGE AT 000000. WE ARE TRYING TO LOCATE A GOOD FAN CONTROL MODULE TO SEE IT THAT HELPED. IN THE MEAN TIME HOW DO I GET RID OF THE SYSTEM FAULT TO SEE WHAT IS WRONG WITH THE SYSTEM?
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Sunday, September 6th, 2009 AT 8:07 PM

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Tiny
MERLIN2021
  • EXPERT
DIAGNOSTIC MODES Entering Diagnostic Mode Turn ignition on. Most tests may be performed with engine running or not running. Test display will indicate when certain tests are not applicable. Depress "OFF" and "WARM" buttons on CCP simultaneously. See Fig. 4. Hold buttons until segment check appears on Instrument Panel Cluster (IPC) and Climate Control Driver Information Center (CCDIC) panel. This is a check of all display segments and indicates the beginning of diagnostic readout. Upon entering diagnostic mode, the climate control will operate in whatever mode was being commanded just prior to depressing the "OFF" and "WARM" buttons. Even though display may change just as buttons are touched, the prior operating mode is remembered and will resume after diagnostic mode is entered. The Extended Compressor at Idle (ECI) is not allowed while in diagnostic mode. This allows observation of system parameters during normal compressor cycles. Fig. 4: Identifying Electronic Climate Control Panel Courtesy of GENERAL MOTORS CORP. Retrieving Stored Trouble Codes 1. Turn ignition on. Enter diagnostics. See ENTERING DIAGNOSTIC MODE. After diagnostic mode is entered, any trouble codes stored in computer memory will be displayed. ECM trouble codes will be displayed first. If no ECM trouble codes are stored, a "NO ECM CODES" message will be displayed. All ECM codes will be prefixed with a "E". The lowest numbered ECM code will be displayed first followed by progressively higher numbered codes present. 2. Following highest ECM code present or "NO ECM CODES" message, BCM trouble codes will be displayed. All BCM codes will be prefixed with a "B". If no BCM trouble codes are stored, "NO BCM CODES" message will be displayed. Codes prefixed with an "L" indicate lighting codes. If no lighting codes are present, "NO LIGHTING CODES" message will be displayed. 3. Any codes displayed will also be accompanied by "Current" or "History". "History" indicates failure was not present last time code was tested, and "Current" indicates fault still exists. At any time during display of ECM, BCM or lighting trouble codes, if "LO" button on Climate Control Panel (CCP) is depressed, the display of trouble codes will be bypassed. At this time, if NOTE: The terms "enter diagnostics" and "exit diagnostics" will be used periodically throughout this section. Follow ENTERING DIAGNOSTIC MODE procedure when instructed to "enter diagnostics". Use EXITING DIAGNOSTIC MODE procedure when instructed to "exit diagnostics". NOTE: The purpose of illuminating the IPC and CCDIC is to check that all segments of vacuum fluorescent displays are working. On IPC, however, the turn signal indicators do not light during this check. Diagnosis should not be attempted unless: all CCDIC segments appear, as this could lead to misdiagnosis. If any portions or segments of CCDIC display are inoperative, it must be replaced. Next diagnostic system level is not desired, see EXITING DIAGNOSTIC MODE. Entering Service Mode To operate diagnostic service modes, continue as follows: 1. Turn ignition on. Enter diagnostics. See ENTERING DIAGNOSTIC MODE. After trouble codes have all been displayed or by-passed (by pressing "LO" button on the CCP), the diagnostic service mode will be entered. The diagnostic service mode can be used to perform different test on each systems one at a time. 2. ECM will be the first available service mode system displayed, followed by BCM, Lighting and Anti-Lock Brakes. To select a system to test, any of the following actions may be taken. Depressing the "OFF" button on CCP will stop system selection process and return display to beginning of trouble code sequence. Depressing the "LO" button on CCP will display next available system selection. This allows display to be stepped through all system choices. This list of systems can be repeated following end of system list. Depressing "HI" button on CCP will select displayed system for testing. Depressing the "OFF" button on CCP will exit test type selection process and return display to next available system selection. Depressing the "LO" button on CCP will display next available test type for selected system. This allows display to be stepped through all available test type choices. This list of test types can be repeated following display of last test type. Depress the "HI" button on CCP will select the displayed test type. At this point the first of several specific tests will appear. 3. Selection of "DATA?", "INPUTS?", "OUT-PUTS?", Or "OVERRIDE?" Test types will result in first available test, being displayed. If dashes ever appear, this test is not allowed with engine running. The 4 characters of the display will contain a test code to identify selection. The first 2 characters are letters which identify system and test type. The last 2 characters numerically identify the test. To select a specific test, any of the following actions may be taken. To control display choices: Depressing the, "OFF" button on CCP will exit test selection process and return display to next available test type for select system. Depressing the "LO" button on CCP will display next smaller test number for selected test type. If this button is pressed with lowest test number displayed, the highest test number will then appear. Depressing the "HI" button on CCP will display next larger test number for the selected test type. If this button is pressed with highest test number displayed, the lowest test number will then appear. 4. Selection of "CLEAR CODES?" Test type will result in message "CODES CLEAR" being displayed along with selected system name. This message will appear for 3 seconds to indicate that all stored trouble codes have been erased from that system's memory. After 3 seconds the display will automatically return to next available test type for selected system. 5. Selection of "SNAPSHOT?" Test type will result, in message "SNAPSHOT TAKEN" being displayed with selected system name proceeding it. This message will appear for 3 seconds to indicate that all system data and inputs have been stored in memory. After 3 seconds the display will automatically proceed to the first available snapshot test type. To select a snapshot test type, any of the following actions may be taken: Depressing the "OFF" button on CCP will exit test type selection process and return display to next available system selection. Depressing the "LO" button will display the next available snapshot test type. This allows the display to be stepped through all available choices. This list of snapshot test types can be repeated following display of last choice. Depressing the "HI" button with "SNAPDATA?" Or "SNAP INPUTS?" Displayed will select that test type. At this point the display is controlled as it would be for non- snapshot data and input displays. All values and status information, however represent memorized vehicle conditions. Depressing the "HI" button with "SNAPSHOT?" Displayed will again display "SNAPSHOT TAKEN" message to indicate that new information has been stored in memory. Access to this information is obtained the same as previously described.
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Tuesday, September 8th, 2009 AT 8:07 AM

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