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Diagnostic Trouble Code Chart

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DTC chart of Air Suspension System: 

DIAGNOSTIC TROUBLE CODE CHART

DTC No. Detection Item Trouble Area OFF Indicator Light Proceed To
C1711/11 Front Height Control Sensor RH Circuit Malfunction
  1. Height control sensor sub-assembly front RH
  2. Right front height control sensor circuit
  3. Suspension control ECU
 Comes on C1711/11 
C1712/12 Front Height Control Sensor LH Circuit Malfunction
  1. Height control sensor sub-assembly front LH
  2. Left front height control sensor circuit
  3. Suspension control ECU
 Comes on C1712/12 
C1713/13 Right Rear Height Control Sensor Circuit
  1. Height control sensor sub-assembly rear RH
  2. Right rear height control sensor circuit
  3. Suspension control ECU
 Comes on C1713/13 
C1714/14 Left Rear Height Control Sensor Circuit
  1. Height control sensor sub-assembly rear LH
  2. Left rear height control sensor circuit
  3. Suspension control ECU
 Comes on C1714/14 
C1735/35 Exhaust Solenoid Valve Circuit
  1. Exhaust solenoid valve
  2. Exhaust solenoid valve circuit
  3. Suspension control ECU
 Comes on C1735/35 
C1737/31 Right Front Height Control Solenoid Valve Circuit
  1. Height control solenoid valve front RH
  2. Right front height control solenoid valve circuit
  3. Suspension control ECU
 Comes on C1737/31 
C1738/32 Left Front Height Control Solenoid Valve Circuit
  1. Height control solenoid valve front LH
  2. Left front height control solenoid valve circuit
  3. Suspension control ECU
 Comes on C1738/32 
C1739/33 Right Rear Height Control Solenoid Valve Circuit
  1. Height control solenoid valve rear RH
  2. Right rear height control solenoid valve circuit
  3. Suspension control ECU
 Comes on C1739/33 
C1740/34 Left Rear Height Control Solenoid Valve Circuit
  1. Height control solenoid valve rear LH
  2. Left rear height control solenoid valve circuit
  3. Suspension control ECU
 Comes on C1740/34 
C1741/41 Air Suspension Relay Circuit
  1. AIR SUS relayn
  2. AIR SUS relay circuit
  3. Suspension control ECU
 Comes on C1741/41 
C1742/42 Height Control Compressor Circuit
  1. Height control compressor motor
  2. Height control compressor circuit
 Comes on C1742/42 
C1744/44 Tank Solenoid Valve Circuit
  1. Tank solenoid valve
  2. Tank solenoid valve circuit
  3. Suspension control ECU
 Goes off C1744/44 
C1751/51(1) Continuous Electric Current to Height Control Compressor
  1. Height control compressor motor
  2. Height control compressor circuit
  3. Each height control sensor link sub-assembly
  4. Each height control sensor sub-assembly
  5. Relief valve
  6. AIR SUS relay comes off
  7. Air leakage from the air tube or each valve
  8. Clogging in the air tube or each valve
  9. Suspension control ECU
 Goes off C1751/51 
C1761/61 ECU Malfunction
  1. Height control sensor sub-assembly power source
  2. Suspension control ECU
 Comes on C1761/61 
C1774/74(2) Power Source Circuit
  1. Battery
  2. Power source circuit
  3. Suspension control ECU
 Goes off C1774/74 
C1776/76 Speed Sensor Circuit
  1. Speed sensor
  2. Speed sensor circuit
  3. Brake actuator assembly (Skid control ECU)
  4. Suspension control ECU
 Goes off C1776/76 
C1779/79 Crankshaft Position Sensor Circuit
  1. Crankshaft position sensor
  2. Crankshaft position sensor circuit
  3. ECM
  4. Suspension control ECU
 Goes off  
C1779/79 
C1782/82 Stop Light Switch Circuit
  1. Stop light switch assembly
  2. Stop light switch circuit
  3. Suspension control ECU
 - C1782/82 
C1784/84 Right Rear Speed Sensor Circuit
  1. Speed sensor
  2. Speed sensor circuit
  3. Brake actuator assembly (Skid control ECU)
 - C1784/84 
C1785/85 Left Rear Speed Sensor Circuit
  1. Speed sensor
  2. Speed sensor circuit
  3. Brake actuator assembly (Skid control ECU)
 - C1785/85 
C1786/86 Height Control Switch Circuit
  1. Height control switch
  2. Height control switch circuit
  3. Suspension control ECU
 - C1786/86 
C1788/88 Height Control OFF Switch Circuit
  1. Height control OFF switch
  2. Height control OFF switch circuit
  3. Suspension control ECU
 - C1788/88 
C1797/97 Crankshaft Position Sensor Circuit
  1. Crankshaft position sensor
  2. Crankshaft position sensor circuit
  3. ECM
  4. Suspension control ECU
 - C1797/97 
C1799/99 Access Mode Switch Circuit
  1. Access mode switch
  2. Access mode switch circuit
  3. Suspension control ECU
 - C1799/99 
(1) Code C1751/51 may be output, even through there is no trouble in the system, when the vehicle is fully loaded with passengers and luggage on a bumpy road or stopped, and the air tube freezes over.
(2) The codes are not memorized after turning the ignition switch off.
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