Infiniti QX56 (Z62). Manual — part 1108
C1801 VHCL HEIGHT SENSOR
SCS-69
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G
H
I
J
K
L
M
A
B
SCS
N
O
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DTC/CIRCUIT DIAGNOSIS
C1801 VHCL HEIGHT SENSOR
DTC Logic
INFOID:0000000006256062
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
With CONSULT-III
1.
Turn ignition switch ON and wait 60 seconds or more.
2.
Perform “Self Diagnostic Results” in “E-SUS”.
Is “C1801” detected ?
YES
>> Go to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006256063
1.
CHECK APPEARANCE
Visually check for malfunction of suspension components, installing malfunction, or deformation of vehicle
height sensor.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repaire or replace damaged parts.
2.
CHECK POWER SUPPLY CIRCUIT (PART 1)
1.
Disconnect vehicle height sensor connector.
2.
Turn ignition switch ON.
CAUTION:
Never start the engine.
3.
Check voltage between vehicle height sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK POWER SUPPLY CIRCUIT (PART 2)
1.
Turn ignition switch OFF.
2.
Disconnect air levelizer control module connector.
DTC
Display itemI
Malfunction detected condition
Possible cause
C1801
VHCL HEIGHT SENSOR
Signal voltage of the vehicle height sensor remains 0.2
V or less or 4.6 V or more continuously for 60 seconds
during sensor voltage (4.5 – 5.5 V) output by the air lev-
elizer control module.
• Harness or connectors
(Sensor circuit is open.)
• Vehicle height sensor
• Air levelizer control module
• Rear suspension component parts
Vehicle height sensor
—
Voltage
Connector Terminal
C13
1
Ground
4.5 – 5.5 V
SCS-70
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C1801 VHCL HEIGHT SENSOR
3.
Check continuity between air levelizer control module harness connector and vehicle height sensor har-
ness connector.
4.
Check continuity between air levelizer control module harness connector and ground.
Is the inspection result normal?
YES
>> 1.
Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
2.
If inspection result is OK, replace the air levelizer control module. Refer to
.
NO
>> Repair or replace damaged parts.
4.
CHECK HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND VEHICLE HEIGHT SENSOR
1.
Turn ignition switch OFF.
2.
Disconnect air levelizer control module connector.
3.
Check continuity between air levelizer control module harness connector and vehicle height sensor har-
ness connector.
4.
Check continuity between air levelizer control module harness connector and ground.
Are the inspection results normal?
YES
>> GO TO 5.
NO
>> Repair or replace damaged parts.
5.
CHECK VEHICLE HEIGHT SENSOR
Check the vehicle height sensor. Refer to
SCS-70, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace the vehicle height sensor. Refer to
SCS-98, "Removal and Installation"
6.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace the air levelizer control module. Refer to
SCS-94, "Removal and Installation"
NO
>> Repair or replace damaged parts.
Component Inspection
INFOID:0000000006256064
1.
CHECK VEHICLE HEIGHT SENSOR
Air levelizer control module
Vehicle height sensor
Continuity
Connector
Terminal
Connector
Terminal
B84
13
C13
1
Existed
Air levelizer control module
—
Continuity
Connector
Terminal
B84
13
Ground
Not existed
Air levelizer control module
Vehicle height sensor
Continuity
Connector
Terminal
Connector
Terminal
B84
5
C13
2
Existed
4
3
Air levelizer control module
—
Continuity
Connector
Terminal
B84
5
Ground
Not existed
4
C1801 VHCL HEIGHT SENSOR
SCS-71
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C
D
F
G
H
I
J
K
L
M
A
B
SCS
N
O
P
1.
Remove the vehicle height sensor. Refer to
SCS-98, "Removal and Installation"
.
2.
Check resistance between vehicle height sensor connector ter-
minals.
Are the inspection results normal?
YES
>> 1.
Install the vehicle height sensor. Refer to
SCS-94, "Removal and Installation"
.
2.
Perform “STANDARD VEHICLE HEIGHT SETTING”. Refer to
.
NO
>> Replace the vehicle height sensor. Refer to
SCS-98, "Removal and Installation"
Vehicle height sensor
Condition
Resistance (Approx.)
Terminal
1
2
A position
1.9 – 3.0 k
Ω
B position
320 – 680
Ω
1
3
Always
1.6 – 2.4 k
Ω
2
3
A position
320 – 680
Ω
B position
1.9 – 3.0 k
Ω
JSEIA0249ZZ
SCS-72
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C1802 AIR SUS COMPRS RELAY
C1802 AIR SUS COMPRS RELAY
DTC Logic
INFOID:0000000006256065
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
With CONSULT-III
1.
Turn ignition switch ON and wait 10 seconds or more.
2.
Select “COMPRESSOR” in “Active Test” in “E-SUS”.
3.
Touch “ON” and wait 5 seconds or more.
4.
Select “Self Diagnostic Result” in “E-SUS”.
Is “C1802” detected ?
YES
>> Go to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006256066
1.
CHECK AIR COMPRESSOR ON SIGNAL FROM AIR LEVELIZER CONTROL MODULE
CONSULT-III
1.
Disconnect air compressor relay connector.
2.
Turn ignition switch ON.
CAUTION:
Never start the engine.
3.
Select “COMPRESSOR” in “Active Test” in “E-SUS”.
4.
Touch “ON”.
5.
While operating test item, check voltage between air compressor relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN AIR LEVELIZER CONTROL MODULE AND AIR COMPRESSOR RELAY
1.
Turn ignition switch OFF.
2.
Disconnect air levelizer control module connector.
DTC
Display item
Malfunction detected condition
Possible cause
C1802
AIR SUS COMPRS RELAY
• Output voltage of the air compressor relay remains
9 V or less continuously for 5 seconds during air
compressor ON signal output by the air levelizer
control module.
• Output voltage of the air compressor relay remains
2 V or more continuously for 10 seconds during air
compressor OFF signal output by the air levelizer
control module.
• Harness or connector
• Air compressor relay
• Air levelizer control module
Air compressor relay
—
Voltage
Connector
Terminal
E116
2
Ground
9 – 16 V
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