Infiniti QX56 (Z62). Manual — part 1111
C1806 VHCL HEIGHT SEN FIX
SCS-81
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C
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C1806 VHCL HEIGHT SEN FIX
DTC Logic
INFOID:0000000006256076
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 VEHICLE HEIGHT SENSOR FIXATION
With CONSULT-III
1.
Start the engine.
2.
Select “VHCL HEIGHT SEN” in “Data Monitor” in “E-SUS”.
3.
Drive vehicle and maintain the following conditions for 5 minutes or more.
Does the value of “VHCL HEIGHT SEN” change?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000006256077
1.
CHECK APPEARANCE
Visually check for installation malfunction, or deformation of vehicle height sensor.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repaire or replace damaged parts.
2.
CHECK VEHICLE HEIGHT SENSOR
Check the vehicle height sensor. Refer to
SCS-70, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
NO
>> Replace the vehicle height sensor. Refer to
SCS-98, "Removal and Installation"
DTC
Display item
Malfunction detected condition
Possible cause
C1806
VHCL HEIGHT SEN FIX
The signal voltage of the vehicle height sensor does
not change for cumulated time of 100 hours under the
condition that the air levelizer control module outputs
sensor voltage (4.5 – 5.5 V) with vehicle speeds 2
km/h (2 MPH) or more.
• Harness or connector
• Vehicle height sensor
Vehicle speed
: 5 km/h (3 MPH) or more
SCS-82
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C1807 VHCL HEIGHT SEN VOLT
C1807 VHCL HEIGHT SEN VOLT
DTC Logic
INFOID:0000000006256078
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 20 seconds or more.
2.
Perform “Self Diagnostic Results” in “E-SUS”.
Is “C1807” detected ?
YES
>> Go to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006256079
1.
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 the vehicle height sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY CIRCUIT (PART 2)
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.
DTC
Display item
Malfunction detected condition
Possible cause
C1807
VHCL HEIGHT SEN VOLT
The sensor power supply is more than 5.5 V or less
than 4.5 V continuously for 20 seconds when the ig-
nition switch is ON.
• Harness or connector
• Vehicle height sensor
• Air levelizer control module
Sensor power supply is 0.5 V or more continuously for
1 second during 2 seconds after turning ON the igni-
tion switch.
Vehicle height sensor
—
Voltage
Connector Terminal
C13
1
Ground
4.5 – 5.5 V
Air levelizer control module
Vehicle height sensor
Continuity
Connector
Terminal
Connector
Terminal
B84
13
C13
1
Existed
C1807 VHCL HEIGHT SEN VOLT
SCS-83
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
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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.
3.
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 4.
NO
>> Repair or replace damaged parts.
4.
CHECK VEHICLE HEIGHT SENSOR
Check the vehicle height sensor. Refer to
SCS-70, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
NO
>> Replace the vehicle height sensor. Refer to
SCS-98, "Removal and Installation"
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
SCS-84
< DTC/CIRCUIT DIAGNOSIS >
[AIR LEVELIZER CONTROL SYSTEM]
C1808 AIR SUS COMPRS FNCTN
C1808 AIR SUS COMPRS FNCTN
DTC Logic
INFOID:0000000006256080
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.
Set vehicle in the unloaded vehicle status.
2.
Start the engine and wait 5 minutes or more.
3.
Perform “Self Diagnostic Result” in “E-SUS”.
Is “C1808” detected ?
YES
>> Go to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006256081
1.
CHECK APPEARANCE
Visually check for malfunction of suspension components, damage of air chamber of rear shock absorber,
installation malfunction, or deformation of vehicle height sensor.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repaire or replace damaged parts.
2.
CHECK AIR LEAK
Apply soapy water to air tube, connecting portions between air tube and each component, and air chamber of
rear shock absorber. Check for air leakage.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repaire or replace damaged parts.
3.
CHECK AIR COMPRESSOR RELAY POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Check 30A fuse (#I).
3.
Disconnect air compressor relay connector.
4.
Check voltage between air compressor relay harness connector and ground.
DTC
Display item
Malfunction detected condition
Possible cause
C1808
AIR SUS COMPRS FNCTN
The cumulative operating time of the air compressor
reaches 180 seconds or more.
NOTE:
Cumulative time is cleared under the following condi-
tions:
• Ignition switch: OFF
• Exhaust conditions: satisfied [Vehicle height re-
mains 15 mm (0.59 in) or more higher than the ref-
erence height for 30 seconds.]
• Harness or connector
• Vehicle height sensor
• Air compressor (exhaust sole-
noid)
• Air compressor relay
• Overloaded
• Rear shock absorber (air cham-
ber)
• Rear suspension component
parts
• Air tube
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