Infiniti QX56 (JA60). Manual - part 812

 

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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 

SCS-24, "Description"

.

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 

SCS-24, "Component 

Function Check"

.

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 

SCS-23, "Diagnosis Procedure"

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 

CHG-

8, "Inspection Procedure"

.

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 

SCS-29, "Wiring Diagram"

.

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 

CHG-

8, "Inspection Procedure"

.

(+)

(-)

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 

SCS-20, "Diagnosis Procedure"

.

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 

SCS-20, 

"Diagnosis Procedure"

.

• Suspension air compressor. Refer to 

SCS-

17, "SUSPENSION AIR COMPRESSOR : 
Diagnosis Procedure"

.

ON

: Compressor turns ON

OFF

: Compressor turns OFF

 

 

 

 

 

 

 

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