DESCRIPTION
The height control sensor changes its resistance value based on changes in vehicle height. The suspension control ECU outputs a fixed voltage of 5 V to the height control sensor's SHB terminal. If the sensor's resistance value changes, the sensor's voltage value changes accordingly. The suspension control ECU then inputs the voltage value from the sensor to detect the vehicle height change.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1711 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor front RH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor front RH is detected for 1 second. | Wire harness or connector Height control sensor front RH Suspension control ECU |
| C1712 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor front LH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor front LH is detected for 1 second. | Wire harness or connector Height control sensor front LH Suspension control ECU |
| C1713 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor rear RH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor rear RH is detected for 1 second. | Wire harness or connector Height control sensor rear RH Suspension control ECU |
| C1714 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor rear LH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor rear LH is detected for 1 second. | Wire harness or connector Height control sensor rear LH Suspension control ECU |
Scheme 30
Scheme 30: WIRING DIAGRAM
The height control sensor changes its resistance value based on changes in vehicle height. The suspension control ECU outputs a fixed voltage of 5 V to the height control sensor's SHB terminal. If the sensor's resistance value changes, the sensor's voltage value changes accordingly. The suspension control ECU then inputs the voltage value from the sensor to detect the vehicle height change.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1711 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor front RH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor front RH is detected for 1 second. | Wire harness or connector Height control sensor front RH Suspension control ECU |
| C1712 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor front LH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor front LH is detected for 1 second. | Wire harness or connector Height control sensor front LH Suspension control ECU |
| C1713 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor rear RH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor rear RH is detected for 1 second. | Wire harness or connector Height control sensor rear RH Suspension control ECU |
| C1714 | When either of the following is detected: With the engine switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor rear LH is detected for 0.5 second. With the engine switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor rear LH is detected for 1 second. | Wire harness or connector Height control sensor rear LH Suspension control ECU |
The No. 1 height control valve independently opens and closes the left and right air passages to the front pneumatic cylinders according to the signals from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1741 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 1 Wire harness or connector Suspension control ECU |
| C1742 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 1 Wire harness or connector Suspension control ECU |
Scheme 31
Scheme 31: WIRING DIAGRAM
The No. 1 height control valve independently opens and closes the left and right air passages to the front pneumatic cylinders according to the signals from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1741 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 1 Wire harness or connector Suspension control ECU |
| C1742 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 1 Wire harness or connector Suspension control ECU |
The No. 2 height control valve independently opens and closes the left and right air passages to the rear pneumatic cylinders according to the signals from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1743 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 2 Wire harness or connector Suspension control ECU |
| C1744 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 2 Wire harness or connector Suspension control ECU |
Scheme 32
Scheme 32: WIRING DIAGRAM
The No. 2 height control valve independently opens and closes the left and right air passages to the rear pneumatic cylinders according to the signals from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1743 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 2 Wire harness or connector Suspension control ECU |
| C1744 | When either of the following is detected: With the height control valve not activated, an open signal of the height control valve is detected for 1 second or more. With the height control valve activated, a short signal of the height control valve is detected 8 times successively. | Height control valve No. 2 Wire harness or connector Suspension control ECU |
The exhaust valve built into the height control compressor assembly opens to discharge compressed air from the pneumatic cylinders into the atmosphere according to the signal from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1745 | When either of the following is detected: With the exhaust valve not activated, an open signal of the exhaust valve is detected for 1 second or more. With the exhaust valve activated, a short signal of the exhaust valve is detected 8 times successively. | Height control compressor assembly (Exhaust valve) Wire harness or connector Suspension control ECU |
Scheme 33
Scheme 33: WIRING DIAGRAM
The exhaust valve built into the height control compressor assembly opens to discharge compressed air from the pneumatic cylinders into the atmosphere according to the signal from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1745 | When either of the following is detected: With the exhaust valve not activated, an open signal of the exhaust valve is detected for 1 second or more. With the exhaust valve activated, a short signal of the exhaust valve is detected 8 times successively. | Height control compressor assembly (Exhaust valve) Wire harness or connector Suspension control ECU |
The low pressure tank valve built into the pneumatic tank assembly opens to store and discharge air in the pneumatic tank according to the signal from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1748 | When either of the following is detected: With the low pressure tank valve not activated, an open signal of the low pressure tank valve is detected for 1 second or more. With the low pressure tank valve activated, a short signal of the low pressure tank valve is detected 8 times successively. | Low pressure tank valve Wire harness or connector Suspension control ECU |
Scheme 34
Scheme 34: WIRING DIAGRAM
The low pressure tank valve built into the pneumatic tank assembly opens to store and discharge air in the pneumatic tank according to the signal from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1748 | When either of the following is detected: With the low pressure tank valve not activated, an open signal of the low pressure tank valve is detected for 1 second or more. With the low pressure tank valve activated, a short signal of the low pressure tank valve is detected 8 times successively. | Low pressure tank valve Wire harness or connector Suspension control ECU |
The signal from the suspension control ECU turns on the AIR SUS relay, and then the height control compressor motor starts.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1751 | When either of the following is detected: With the AIR SUS relay not activated, an open signal of the AIR SUS relay is detected for 1 second or more. With the AIR SUS relay activated, a short signal of the AIR SUS relay is detected 8 times successively. | AIR SUS relay Wire harness or connector Suspension control ECU |
Scheme 35
Scheme 35: WIRING DIAGRAM
The signal from the suspension control ECU turns on the AIR SUS relay, and then the height control compressor motor starts.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1751 | When either of the following is detected: With the AIR SUS relay not activated, an open signal of the AIR SUS relay is detected for 1 second or more. With the AIR SUS relay activated, a short signal of the AIR SUS relay is detected 8 times successively. | AIR SUS relay Wire harness or connector Suspension control ECU |
The signal from the suspension control ECU turns on the AIR SUS relay. At that time, battery voltage is input to the height control compressor motor through the AIR SUS relay. The height control compressor motor starts.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1752 | With the AIR SUS relay activated, a lock signal of the height control compressor motor is detected for 4 sec. or more. | AIR SUS relay AIR SUS fusible link Height control compressor assembly (compressor motor) Wire harness or connector Suspension control ECU |
Scheme 36
Scheme 36: WIRING DIAGRAM
The signal from the suspension control ECU turns on the AIR SUS relay. At that time, battery voltage is input to the height control compressor motor through the AIR SUS relay. The height control compressor motor starts.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1752 | With the AIR SUS relay activated, a lock signal of the height control compressor motor is detected for 4 sec. or more. | AIR SUS relay AIR SUS fusible link Height control compressor assembly (compressor motor) Wire harness or connector Suspension control ECU |
The signal from the suspension control ECU operates the AIR SUS relay and the height control compressor motor starts. The height control compressor motor operates until the targeted vehicle height is reached. Then the height control sensor sends the signal to the suspension control ECU, and stops the height control compressor motor.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1761 | While AIR SUS relay is ON, vehicle height does not reach target for 3 minutes or more | Air leakage from the air tube or each valve Height control valve No. 1 Height control valve No. 2 Height control compressor assembly (Exhaust valve) Pneumatic tank assembly (Low pressure tank valve) Height control compressor assembly (Compressor motor) AIR SUS relay Wire harness or connector Suspension control ECU |
The signal from the suspension control ECU operates the AIR SUS relay and the height control compressor motor starts. The height control compressor motor operates until the targeted vehicle height is reached. Then the height control sensor sends the signal to the suspension control ECU, and stops the height control compressor motor.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1761 | While AIR SUS relay is ON, vehicle height does not reach target for 3 minutes or more | Air leakage from the air tube or each valve Height control valve No. 1 Height control valve No. 2 Height control compressor assembly (Exhaust valve) Pneumatic tank assembly (Low pressure tank valve) Height control compressor assembly (Compressor motor) AIR SUS relay Wire harness or connector Suspension control ECU |
The exhaust valve built into the height control compressor assembly opens to discharge compressed air from the pneumatic cylinders into the atmosphere according to the signal from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1762 | Control to lower the vehicle is on continuously for 3 minutes. | Air leakage from the air tube or each valve Height control valve No. 1 Height control valve No. 2 Height control compressor assembly (Exhaust valve) Pneumatic w/tube tank assembly (Low pressure tank valve) Wire harness or connector Suspension control ECU |
The exhaust valve built into the height control compressor assembly opens to discharge compressed air from the pneumatic cylinders into the atmosphere according to the signal from the suspension control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1762 | Control to lower the vehicle is on continuously for 3 minutes. | Air leakage from the air tube or each valve Height control valve No. 1 Height control valve No. 2 Height control compressor assembly (Exhaust valve) Pneumatic w/tube tank assembly (Low pressure tank valve) Wire harness or connector Suspension control ECU |
If a malfunction in the suspension control ECU is detected, DTC C1781 is output.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1781 | When one of the following conditions is met: Non-volatile memory malfunction CAN communication resistor malfunction Main relay lock-up malfunction | CAN communication system Suspension control ECU |
If a malfunction in the suspension control ECU is detected, DTC C1781 is output.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1781 | When one of the following conditions is met: Non-volatile memory malfunction CAN communication resistor malfunction Main relay lock-up malfunction | CAN communication system Suspension control ECU |
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1782 | When one of the following conditions is met: IG terminal voltage is 10 V or less or 16 V or more continuously for 0.5 seconds BAT terminal voltage is 10 V or less or 16 V or more continuously for 0.5 seconds Signals are sent from the wheel speed sensor for 5 seconds although the ECU determines that the engine switch is off. | Battery Charging system ECU IG1 Fuse AIR SUS Fuse Wire harness or connector Suspension control ECU |
Scheme 37
Scheme 37: WIRING DIAGRAM
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1782 | When one of the following conditions is met: IG terminal voltage is 10 V or less or 16 V or more continuously for 0.5 seconds BAT terminal voltage is 10 V or less or 16 V or more continuously for 0.5 seconds Signals are sent from the wheel speed sensor for 5 seconds although the ECU determines that the engine switch is off. | Battery Charging system ECU IG1 Fuse AIR SUS Fuse Wire harness or connector Suspension control ECU |
The suspension control ECU receives wheel speed sensor signals via the CAN communication system from the skid control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1783 | Detects speed sensor malfunction signals from the skid control ECU for 1 second. | Speed sensor circuit Skid control ECU Suspension control ECU |
The suspension control ECU receives wheel speed sensor signals via the CAN communication system from the skid control ECU.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1783 | Detects speed sensor malfunction signals from the skid control ECU for 1 second. | Speed sensor circuit Skid control ECU Suspension control ECU |
The suspension control ECU receives longitudinal G signals and lateral G signals via the CAN communication system from the yaw rate and acceleration sensor.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1787 | Detects sensor malfunction signals from the yaw rate and acceleration sensor | Yaw rate sensor |
The suspension control ECU receives longitudinal G signals and lateral G signals via the CAN communication system from the yaw rate and acceleration sensor.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1787 | Detects sensor malfunction signals from the yaw rate and acceleration sensor | Yaw rate sensor |
- This DTC is stored when the suspension control ECU is initialized, and is cleared when the vehicle identification information received through CAN communication is correctly stored in the EEPROM.
- DTC C1789 is stored as the vehicle specification and data do not match when an incorrect ECM is installed.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1789 | When one of the following conditions is met: Vehicle identification information not registered. Vehicle identification information different from the stored information has been received 3 times. | Vehicle identification information not registered ECM Suspension control ECU |
- This DTC is stored when the suspension control ECU is initialized, and is cleared when the vehicle identification information received through CAN communication is correctly stored in the EEPROM.
- DTC C1789 is stored as the vehicle specification and data do not match when an incorrect ECM is installed.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| C1789 | When one of the following conditions is met: Vehicle identification information not registered. Vehicle identification information different from the stored information has been received 3 times. | Vehicle identification information not registered ECM Suspension control ECU |
Pressing the height control switch (driver seat) while the engine is running for approximately 1 second switches modes. If the switch is pressed while the vehicle height is changing, vehicle height control will be cancelled.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1792 | Detected only during Test Mode. | Height control switch (driver seat) Harness or connector Suspension control ECU |
Scheme 38
Scheme 38: WIRING DIAGRAM
Pressing the height control switch (driver seat) while the engine is running for approximately 1 second switches modes. If the switch is pressed while the vehicle height is changing, vehicle height control will be cancelled.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1792 | Detected only during Test Mode. | Height control switch (driver seat) Harness or connector Suspension control ECU |
If the height control OFF switch is pressed when the vehicle is stopped with the engine running or the engine switch on (IG), vehicle height control will be disabled and remain disabled even after the engine switch is turned off. In this case, "HEIGHT CONTROL OFF" will be displayed on the multi-information display in the combination meter assembly. Pressing the height control OFF switch again with the engine running or the engine switch on (IG) will resume the vehicle height control. If the vehicle speed reaches approximately 30 km/h when the vehicle height control is disabled, vehicle height control will automatically resume.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1794 | Detected only during Test Mode. | Height control OFF switch Harness or connector Suspension control ECU |
Scheme 39
Scheme 39: WIRING DIAGRAM
If the height control OFF switch is pressed when the vehicle is stopped with the engine running or the engine switch on (IG), vehicle height control will be disabled and remain disabled even after the engine switch is turned off. In this case, "HEIGHT CONTROL OFF" will be displayed on the multi-information display in the combination meter assembly. Pressing the height control OFF switch again with the engine running or the engine switch on (IG) will resume the vehicle height control. If the vehicle speed reaches approximately 30 km/h when the vehicle height control is disabled, vehicle height control will automatically resume.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1794 | Detected only during Test Mode. | Height control OFF switch Harness or connector Suspension control ECU |
Pressing the height control switch (luggage compartment) for approximately 1 second switches modes. This switch can be operated with the engine on or off, the shift lever in P and the back door open. When the engine switch is off, this switch can be only be used to lower the vehicle height. If the switch is pressed while the vehicle height is changing, vehicle height control will be cancelled.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1799 | Detected only during Test Mode. | Height control switch (luggage compartment) Harness or connector Suspension control ECU |
Scheme 40
Scheme 40: WIRING DIAGRAM
Pressing the height control switch (luggage compartment) for approximately 1 second switches modes. This switch can be operated with the engine on or off, the shift lever in P and the back door open. When the engine switch is off, this switch can be only be used to lower the vehicle height. If the switch is pressed while the vehicle height is changing, vehicle height control will be cancelled.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|
| C1799 | Detected only during Test Mode. | Height control switch (luggage compartment) Harness or connector Suspension control ECU |
The suspension control ECU inputs signals from the skid control ECU, yaw rate sensor, ECM, TCM and main body ECU via CAN communication.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| U0100 | While driving at 19 mph (30 km/h), ECM informs of CAN communication stop for 3 seconds or more | CAN communication line ECM Suspension control ECU |
| U0101 | While driving at 19 mph (30 km/h), TCM informs of CAN communication stop for 3 seconds or more | CAN communication line TCM Suspension control ECU |
| U0122 | Skid control ECU informs of CAN communication stop for 3 seconds or more | CAN communication line Skid control ECU Suspension control ECU |
| U0124 | Yaw rate sensor informs of CAN communication stop for 3 seconds or more | CAN communication line Yaw rate sensor Suspension control ECU |
| U0140 | Main body ECU informs of CAN communication stop for 10 seconds or more | CAN communication line Main body ECU Suspension control ECU |
The suspension control ECU inputs signals from the skid control ECU, yaw rate sensor, ECM, TCM and main body ECU via CAN communication.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|
| U0100 | While driving at 19 mph (30 km/h), ECM informs of CAN communication stop for 3 seconds or more | CAN communication line ECM Suspension control ECU |
| U0101 | While driving at 19 mph (30 km/h), TCM informs of CAN communication stop for 3 seconds or more | CAN communication line TCM Suspension control ECU |
| U0122 | Skid control ECU informs of CAN communication stop for 3 seconds or more | CAN communication line Skid control ECU Suspension control ECU |
| U0124 | Yaw rate sensor informs of CAN communication stop for 3 seconds or more | CAN communication line Yaw rate sensor Suspension control ECU |
| U0140 | Main body ECU informs of CAN communication stop for 10 seconds or more | CAN communication line Main body ECU Suspension control ECU |
