Infiniti QX56 (JA60). Manual — part 812
C1805 HEIGHT ADJUSTING MALFUNCTION (EXH SOLENOID)
SCS-13
< COMPONENT DIAGNOSIS >
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C1805 HEIGHT ADJUSTING MALFUNCTION (EXH SOLENOID)
Description
INFOID:0000000005148163
The exhaust valve solenoid controls the vent function of the suspension control system. The exhaust valve
solenoid is built into the suspension air compressor. The suspension control unit supplies voltage to the
exhaust valve solenoid to activate it.
DTC Logic
INFOID:0000000005148164
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148165
1.
CHECK EXHAUST SOLENOID OPERATION
CAUTION:
While operating this active test, the suspension control system will vent air pressure and the vehicle
ride height will lower. Ensure the area around the vehicle is free from obstructions before beginning
test.
CONSULT-III
1. Ensure the suspension control system has air pressure and is not drooping in the rear.
2. Select "EXHAUST SOLENOID" of AIR LEVELIZER active test items.
3. While operating test item, check that the exhaust valve solenoid opens to vent air from the system. The
vehicle should lower when the exhaust valve solenoid is activated.
Does the system vent properly?
YES
>> Exhaust valve solenoid is operating normally.
NO
>> Refer to
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1805
VEHICLE HEIGHT AD-
JUSTING MALFUNC-
TION (EXHAUST
SOLENOID)
Continuous exhaust valve solenoid ON time is
more than 120 seconds.
Short to power in the exhaust valve solenoid
control circuit. Refer to
ON
: Air vents and vehicle ride height lowers
OFF
: No air vents and vehicle ride height remains constant
SCS-14
< COMPONENT DIAGNOSIS >
C1806 VEHICLE HEIGHT SENSOR LOCKING MALFUNCTION
C1806 VEHICLE HEIGHT SENSOR LOCKING MALFUNCTION
Description
INFOID:0000000005148166
The vehicle height sensor operates on a 5 volt reference signal from the suspension control unit. The suspen-
sion control unit also provides ground to the height sensor.
DTC Logic
INFOID:0000000005148167
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148168
1.
CHECK HEIGHT SENSOR OPERATION
CONSULT-III
1. Turn ignition switch ON
2. Select "HEIGT SEN" of AIR LEVELIZER data monitor test item.
Is the HEIGHT SEN voltage within the given range?
YES
>> Height sensor is operating normally.
NO
>> Refer to
.
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1806
VEHICLE HEIGHT SEN-
SOR LOCKING MAL-
FUNCTION
Output sensor voltage variation
±0.02V is more
than 100 seconds when vehicle height range is
normal.
• Height sensor power/ground supply. Refer to
SCS-18, "HEIGHT SENSOR : Diagnosis
Procedure"
• Charging system malfunction. Refer to
HEIGHT SEN
: 0.2V - 4.8V with no more than
±0.02V
variation
C1807 SENSOR 5V MALFUNCTION
SCS-15
< COMPONENT DIAGNOSIS >
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C1807 SENSOR 5V MALFUNCTION
Description
INFOID:0000000005148169
The vehicle height sensor operates on a 5 volt reference signal from the suspension control unit. The suspen-
sion control unit also provides ground to the height sensor.
DTC Logic
INFOID:0000000005148170
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148171
Regarding Wiring Diagram information, refer to
.
1.
POWER SUPPLY CIRCUIT CHECK
1. Disconnect height sensor connector C8.
2. Turn the ignition switch ON.
3. Check voltage between the height sensor connector C8 terminal
1 and ground.
Is 5V present?
YES
>> System is working normally.
NO
>> Check harness or connector for open or short. If OK,
replace the suspension control unit. Refer to
RSU-26, "Removal and Installation"
.
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1807
SENSOR 5V MALFUNC-
TION
Sensor reference voltage is less than 0.8V or
more than 6V for 20 seconds.
• Height sensor power/ground supply. Refer to
SCS-18, "HEIGHT SENSOR : Diagnosis
Procedure"
• Charging system malfunction. Refer to
(+)
(-)
Voltage
Connector
Terminal
C8
1
Ground
5V
ALEIA0026GB
SCS-16
< COMPONENT DIAGNOSIS >
C1808 INTEGRAL TIME MALFUNCTION SUPPLYING AIR
C1808 INTEGRAL TIME MALFUNCTION SUPPLYING AIR
Description
INFOID:0000000005148172
The suspension air compressor is supplied power by the compressor motor relay. The suspension control unit
supplies power to the compressor motor relay in order to activate the relay and subsequently activate the sus-
pension air compressor.
DTC Logic
INFOID:0000000005148173
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005148174
1.
CHECK COMPRESSOR MOTOR RELAY OPERATION
CAUTION:
The "COMPRESSOR" active test will remain ON until it is turned off using CONSULT-III. Allowing the
compressor to run for an extended period of time may cause damage to the air levelizer system com-
ponents due to excessive air pressure.
CONSULT-III
1. Turn ignition ON.
2. Select "COMPRESSOR" of AIR LEVELIZER active test items.
3. While operating test item, check that the suspension air compressor turns ON.
Does the suspension air compressor operate properly?
YES
>> Compressor motor relay and suspension air compressor are operating normally.
NO
>> Refer to
.
DTC
CONSULT-III
Diagnostic item is detected when ...
Probable malfunction location
C1808
INTEGRAL TIME MAL-
FUNCTION SUPPLYING
AIR
A suspension air compressor ON request has
been in effect for 180 seconds and the suspen-
sion air compressor has not activated during
that time.
• Compressor motor relay. Refer to
• Suspension air compressor. Refer to
17, "SUSPENSION AIR COMPRESSOR :
Diagnosis Procedure"
.
ON
: Compressor turns ON
OFF
: Compressor turns OFF
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