Infiniti QX56 (JA60). Manual - part 817

SUSPENSION CONTROL UNIT

SCS-33

< ECU DIAGNOSIS >

C

D

F

G

H

I

J

K

L

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A

B

SCS

N

O

P

ABEIA0017GB

SCS-34

< ECU DIAGNOSIS >

SUSPENSION CONTROL UNIT

DTC Index

INFOID:0000000005148192

Self-diagnosis results display item

ABEIA0018GB

CONSULT-III display

Malfunction

Reference page

Vehicle height sensor [C1801]

Vehicle height sensor voltage is less than 0.2V or greater than 
4.8V for more than 60 seconds.

SCS-9, 
"Diagnosis Procedure"

.

SUSPENSION CONTROL UNIT

SCS-35

< ECU DIAGNOSIS >

C

D

F

G

H

I

J

K

L

M

A

B

SCS

N

O

P

Compressor relay [C1802]

• Driving transistor for compressor relay is OFF and monitor 

voltage continues at a high level for more than 10 seconds.

• Driving transistor for compressor relay is ON and monitor 

voltage continues at a low level for more than 5 seconds.

SCS-10, 
"Diagnosis Procedure"

.

Exhaust solenoid [C1803]

• Driving transistor for exhaust valve solenoid is OFF and 

monitor voltage continues at a high level for more than 10 
seconds.

• Driving transistor for exhaust valve solenoid is ON and mon-

itor voltage continues at a low level for more than 5 seconds.

SCS-11, 
"Diagnosis Procedure"

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Vehicle height adjusting malfunc-
tion (compressor)[C1804]

Continuous compressor relay ON time is more than 120 sec-
onds.

SCS-12, 
"Diagnosis Procedure"

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Vehicle height adjusting malfunc-
tion (exhaust solenoid)[C1805]

Continuous exhaust valve solenoid ON time is more than 120 
seconds.

SCS-13, 
"Diagnosis Procedure"

.

Vehicle height sensor locking mal-
function [C1806]

Output sensor voltage variation 

±0.02V is more than 100 sec-

onds when vehicle height range is normal.

SCS-14, "Diagnosis Proce-
dure"

.

Sensor 5V malfunction [C1807]

Sensor reference voltage is less than 0.8V or more than 6V for 
20 seconds.

SCS-15, 
"Diagnosis Procedure"

Integral time malfunction by sup-
plying air [C1808]

A suspension air compressor ON request has been in effect 
for 180 seconds and the suspension air compressor has not 
activated during that time. 

SCS-16, 
"Diagnosis Procedure"

.

SCS-36

< SYMPTOM DIAGNOSIS >

SUSPENSION CONTROL SYSTEM

SYMPTOM DIAGNOSIS

SUSPENSION CONTROL SYSTEM

Symptom Table

INFOID:0000000005148193

AIR LEVELIZER

Symptom

Possible cause

Reference page

Inoperative

• Suspension control unit
• Compressor motor relay
• Suspension air compressor

SCS-37, "Diagnosis Proce-
dure"

System does not raise

• Suspension control unit
• Height sensor
• Compressor motor relay
• Suspension air compressor
• Leak in system
• Restriction in system

SCS-38, "Diagnosis Proce-
dure"

System does not lower

• Suspension control unit
• Height sensor
• Compressor motor relay
• Suspension air compressor
• Restriction in system

SCS-39, "Diagnosis Proce-
dure"

CK SUSP indicator lamp always ON with key ON

• CK SUSP indicator lamp control circuit
• Suspension control unit

SCS-26, "Description"