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Retrieving Diagnostic Trouble Codes

  1. Hook-up New Generation Star (NGS) scan tester. See EQUIPMENT HOOK-UP  under TESTING & DIAGNOSIS. Turn ignition switch to RUN position. Rotate dial (on scan tester) to menu item DIAGNOSTIC DATA LINK, and press trigger to select. Advance to next screen and select VDM-VEHICLE DYNAMICS MODULE.
  2. Advance to next screen and select DIAGNOSTIC TEST MODES. Advance to next screen and select RETRIEVE/CLEAR CONTINUOUS DTC. Advance to next screen and press start (button 3).
  3. At this screen, DTCs will be displayed. Record DTCs. To clear individual codes, rotate knob to highlight DTC then press Button 8. To clear all codes, press Button 7.
  4. To determine if fault(s) are hard faults or intermittent faults, clear codes. Recheck for Diagnostic Trouble Code (DTCs). If code(s) reappears shortly after clearing all codes, code is considered a hard fault. If fault is intermittent, attempt to re-create condition that caused code to set. See WIGGLE TEST  .
  5. Once all DTCs have been retrieved and recorded, go to DIAGNOSTIC TROUBLE CODE DIRECTORY TABLE. Perform appropriate diagnostic test. If no codes exist, go to SYMPTOM DIAGNOSIS  . If any retrieved code begins with letter "U", perform COMMUNICATIONS NETWORK DIAGNOSTICS in appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES/SAFETY EQUIPMENT section.
DIAGNOSTIC TROUBLE CODE DIRECTORY

Code Description (1) Go To Test
B1317 Module Detects High Voltage P 
B1318 Module Detects Low Voltage N 
B1342 Module Failure M 
C1722 Height Sensor Ckt Shorted To Battery B 
C1723 Height Sensor Ckt Shorted To Ground A 
C1731 (2) Left Front Corner Up V 
C1732 (2) Left Front Corner Down U 
C1733 (2) Right Front Corner Up V 
C1734 (2) Right Front Corner Down U 
C1735 Left Rear Corner Up V 
C1736 Left Rear Corner Down U 
C1737 Right Rear Corner Up V 
C1738 Right Rear Corner Down U 
C1770 Vent Solenoid Ckt Failure J 
C1773 Vent Solenoid Short To Ground H 
C1790 Left Rear Air Spring Solenoid Ckt Failure G 
C1793 Left Rear Air Spring Solenoid Short To Ground F 
C1795 Right Rear Air Spring Solenoid G 
C1798 Right Rear Air Spring Solenoid Short To Ground F 
C1820 Compressor Thermal Timeout Exceeded T 
C1840 Air Suspension Switch Failure A 
C1842 Air Suspension Switch Short To Battery B 
C1873 (2) Right Front Air Spring Solenoid Ckt Failure G 
C1876 (2) Right Front Air Spring Solenoid Short To Ground F 
C1877 (2) Left Front Air Spring Solenoid Ckt Failure G 
C1880 (2) Left Front Air Spring Solenoid Short To Ground F 
C1882 Right Front Height Sensor Open Ckt D 
C1883 Right Front Height Sensor Short To Battery C 
C1884 Right Front Height Sensor Short To Ground E 
C1886 Right Rear Height Sensor Open Ckt D 
C1887 Right Rear Height Sensor Short To Battery C 
C1888 Right Rear Height Sensor Short To Ground E 
C1890 Left Front Height Sensor Open Ckt D 
C1891 Left Front Height Sensor Short To Battery C 
C1892 Left Front Height Sensor Signal Short To Ground E 
C1894 Left Rear Height Sensor Open Ckt D 
C1895 Left Rear Height Sensor Short To Battery C 
C1896 Left Rear Height Sensor Short To Ground E 
C1898 Variable Assist Power Steering Ckt Failure S 
C1901 Right Rear Shock Actuator Ckt Failure L 
C1904 Right Rear Shock Actuator Short To Ground K 
C1905 Left Rear Shock Actuator Ckt Failure L 
C1908 Left Rear Shock Actuator Short To Ground K 
C1909 Right Front Shock Actuator Ckt Failure L 
C1912 Right Front Shock Actuator Short To Ground K 
C1913 Left Front Shock Actuator Ckt Failure L 
C1916 Left Front Shock Actuator Short To Ground K 
C1929 Compressor Relay Ckt Failure R 
C1931 Compressor Relay Short To Ground Q 
(1) Perform appropriate test under DIAGNOSTIC TESTS  .
(2) On 1996 models only.
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