2004 INFINITI QX56 Factory Service Manual

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Page 2865 of 3371

INFINITI QX56 2004 Factory Service Manual RSU-6
CAN COMMUNICATION
Revision: August 20072004 QX56
CAN COMMUNICATIONPFP:23710
System DescriptionEES00112
Refer to LAN-5, "CAN COMMUNICATION" .

Page 2866 of 3371

INFINITI QX56 2004 Factory Service Manual TROUBLE DIAGNOSIS
RSU-7
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Revision: August 20072004 QX56
TROUBLE DIAGNOSISPFP:00000
How to Perform Trouble Diagnoses for Quick and Accurate RepairEES00113
INTRODUCTION
The rea

Page 2867 of 3371

INFINITI QX56 2004 Factory Service Manual RSU-8
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
WORK FLOW
WEIA0077E

Page 2868 of 3371

INFINITI QX56 2004 Factory Service Manual TROUBLE DIAGNOSIS
RSU-9
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Revision: August 20072004 QX56
Component Parts and Harness Connector LocationEES00114
WEIA0140E

Page 2869 of 3371

INFINITI QX56 2004 Factory Service Manual RSU-10
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Wiring Diagram — A/SUSP —EES00115
WEWA0024E

Page 2870 of 3371

INFINITI QX56 2004 Factory Service Manual TROUBLE DIAGNOSIS
RSU-11
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Revision: August 20072004 QX56
WEWA0042E

Page 2871 of 3371

INFINITI QX56 2004 Factory Service Manual RSU-12
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Basic InspectionEES00116
AIR HOSES
1. Check for pinched or damaged air hoses between the suspension air reservoir and each load leveling rear
ai

RSU-12
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Basic InspectionEES00116
AIR HOSES
1. Check for pinched or damaged air hoses between the suspension air reservoir and each load leveling rear
air suspension shock absorber. Reposition, repair or replace hoses as necessary.
2. Check the air hose connections at the suspension air reservoir and at the shock absorbers for leaks. If
connections are leaking, repair or replace hoses as necessary.
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, make
sure the battery is sufficiently charged.
CK SUSP INDICATOR LAMP INSPECTION
1. Make sure the CK SUSP indicator lamp turns on for approximately 2 seconds when the ignition switch is
turned ON. If it does not, check the combination meter. Refer to DI-5, "
COMBINATION METERS" .
2. Make sure the lamp turns off approximately 2 seconds after the ignition switch is turned ON. If the lamp
does not turn off, conduct self-diagnosis of the suspension control unit.
3. After conducting the self-diagnosis, be sure to erase the error memory. Refer to RSU-13, "
CONSULT-II
Function (AIR LEVELIZER)" .
CK SUSP Indicator Lamp TimingEES00117
X: ON
—: OFF
Control Unit Input/Output Signal StandardEES00118
( ): Wire colorConditionCK SUSP
indicator lampRemarks
Ignition switch OFF – –
Ignition switch ON X Turns off after approximately 2 seconds.
Te r m i n a l
Item ConditionVoltage (V)
(Approx.)
+–
1 (V)
GroundCompressor relay output
Ignition switch ON or STARTBattery voltage
3 (W) Height sensor signal input 0.2V - 4.8V
5 (R) Reference voltage 5V
6 (G/R) Ignition power
Battery voltage
7 (W/L) Battery power —
8 (G/W) Diagnostic K-line — —
9 (SB) Exhaust valve output Ignition switch ON or START Battery voltage
10 (BR) Warning lamp output — —
14 (L) Height sensor ground — —
15 (BR/W) Alternator L signal input Engine running —
16 (B) Suspension control unit ground — 0V

Page 2872 of 3371

INFINITI QX56 2004 Factory Service Manual TROUBLE DIAGNOSIS
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Revision: August 20072004 QX56
CONSULT-II Function (AIR LEVELIZER)EES00119
CONSULT-II can display each diagnostic item using the diagnostic test mod

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