ignition INFINITI QX56 2009 Factory Service Manual

P1554 BATTERY CURRENT SENSOREC-321
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2. Check voltage between ECM terminal 71 (battery current sensor
signal) and ground for 10 seconds.
The voltage should be ab ove 2.3V at least once.
3. If NG, go to EC-321, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771623
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body. Refer to EC-85, "Ground Inspection"
.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect battery current sensor (1) harness connector.
2. Turn ignition switch ON. : Vehicle front
3. Check voltage between battery current sensor terminal 1 and ground with CONSULT-III or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
PBIB2616E
BBIA0354E
BBIA0744E
Voltage: Approximately 5V
PBIA9891J
Revision: December 20092009 QX56

EC-322
< COMPONENT DIAGNOSIS >[VK56DE]
P1554 BATTERY CURRENT SENSOR
Check the following.
 Harness connectors E5, F14
 Harness for open or short between battery current sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK BATTERY CURRENT SENSOR GRO UND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between battery curr ent sensor terminal 2 and ECM terminal 67.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E5, F14
 Harness for open or short between battery current sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK BATTERY CURRENT SENSOR INPUT SI GNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between battery curr ent sensor terminal 3 and ECM terminal 71.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E2, F32
 Harness for open or short between battery current sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK BATTERY CURRENT SENSOR
Refer to EC-322, "Component Inspection"
.
OK or NG
OK >> GO TO 9.
NG >> Replace battery negative cable assembly.
9.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003771624
BATTERY CURRENT SENSOR
Continuity should exist.
Continuity should exist.
Revision: December 20092009 QX56

P1554 BATTERY CURRENT SENSOREC-323
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1. Reconnect harness connectors disconnected.
2. Disconnect battery negative cable (1).
3. Install jumper cable (A) between battery negative terminal and
body ground.
4. Turn ignition switch ON.
5. Check voltage between ECM terminal 71 (battery current sensor signal) and ground.
6. If NG, replace battery negative cable assembly.
BBIA0745E
Voltage: Approximately 2.5V
PBIB2617E
Revision: December 20092009 QX56

EC-324
< COMPONENT DIAGNOSIS >[VK56DE]
P1564 ICC STEERING SWITCH
P1564 ICC STEERING SWITCH
Component DescriptionINFOID:0000000003771625
ICC steering switch has variant values of electrical
resistance for each button. ECM reads voltage variation of
switch, and determines which button is operated.
Refer to CCS-13, "System Description"
for the ICC function.
On Board Diagn osis LogicINFOID:0000000003771626
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this self-diagnosis .
NOTE:
If DTC P1564 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer to
EC-282, "On Board Diagnosis Logic"
.
DTC Confirmation ProcedureINFOID:0000000003771627
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Wait at least 10 seconds.
4. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
5. Press CANCEL switch for at least 10 seconds , then release it and wait at least 10 seconds.
6. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
7. Press SET/COAST switch for at least 10 seconds , then release it and wait at least 10 seconds.
8. Press DISTANCE switch for at least 10 seconds , then release it and wait at least 10 seconds.
9. Check DTC.
10. If DTC is detected, go to EC-324, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771628
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
PBIB2640E
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
P1564
1564 ICC steering switch  An excessively high voltage signal from the
ICC steering switch is sent to ECM.
 ECM detects that input signal from the ICC
steering switch is out of the specified range.
 ECM detects that the ICC steering switch is stuck ON.  Harness or connectors
(The switch circuit is open or shorted.)
 ICC steering switch
 Combination switch (spiral cable)
ECM
Revision: December 20092009 QX56

P1564 ICC STEERING SWITCHEC-325
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Refer to
EC-85, "Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK ICC STEERING SWITCH CIRCUIT
With CONSULT-IIl
1. Turn ignition switch ON.
2. Select “MAIN SW”, “CANCEL SW ”, “RESUME/ACC SW”, “SET SW” and “DIST SW” in “DATA MONITOR”
mode with CONSULT-IIl.
3. Check each item indication under the following conditions.
Without CONSULT-IIl
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 99 and ground with press- ing each button.
OK or NG
BBIA0354E
Switch Monitor item Condition Indication
MAIN switch MAIN SW Pressed ON
Released OFF
CANCEL switch CANCEL SW Pressed ON
Released OFF
RESUME/ACCELERATE
switch RESUME/ACC SWPressed ON
Released OFF
SET/COAST switch SET SW Pressed ON
Released OFF
DISTANCE switch DIST SW Pressed ON
Released OFF
Switch Condition Voltage [V]
MAIN switch Pressed Approx. 0
Released Approx. 4.3
CANCEL switch Pressed Approx. 1.3
Released Approx. 4.3
RESUME/ACCELERATE
switch Pressed Approx. 3.7
Released Approx. 4.3
SET/COAST switch Pressed Approx. 3.0
Released Approx. 4.3
DISTANCE switch Pressed Approx. 2.2
Released Approx. 4.3
PBIB0311E
Revision: December 20092009 QX56

EC-326
< COMPONENT DIAGNOSIS >[VK56DE]
P1564 ICC STEERING SWITCH
OK >> GO TO 8.
NG >> GO TO 3.
3.CHECK ICC STEERING SWITCH GRO
UND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect combination switch harness connector.
4. Check harness continuity between combination switch terminal 15 and ECM terminal 67. Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors M31, E152
 Harness connectors E5, F14
 Combination switch (spiral cable)
 Harness for open and short between ECM and combination switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK ICC STEERING SWITCH INPUT S IGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 99 and combination switch terminal 14. Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors M31, E152
 Combination switch (spiral cable)
 Harness for open and short between ECM and combination switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK ICC STEERING SWITCH
Refer to EC-326, "Component Inspection"
.
OK or NG
OK >> GO TO 8.
NG >> Replace ICC steering switch.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003771629
ICC STEERING SWITCH
Continuity should exist.
Continuity should exist.
Revision: December 20092009 QX56

EC-328
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P1564 ASCD STEERING SWITCH
P1564 ASCD STEERING SWITCH
Component DescriptionINFOID:0000000003771630
ASCD steering switch has variant values of electrical
resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.
Refer to EC-33, "System Description"
for the ASCD function.
On Board Diagn osis LogicINFOID:0000000003771631
This self-diagnosis has the one trip detection logic.
 The MIL will not light up for this self-diagnosis.
NOTE:
If DTC P1564 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer to
EC-282, "On Board Diagnosis Logic"
.
DTC Confirmation ProcedureINFOID:0000000003771632
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Wait at least 10 seconds.
4. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
5. Press CANCEL switch for at least 10 seconds , then release it and wait at least 10 seconds.
6. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
7. Press SET/COAST switch for at least 10 seconds , then release it and wait at least 10 seconds.
8. Check DTC.
9. If DTC is detected, go to EC-328, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771633
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
PBIB2640E
DTC No. Trouble Diagnosi s Name DTC Detecting Co ndition Possible Cause
P1564
1564 ASCD steering switch  An excessively high voltage signal from the ASCD
steering switch is sent to ECM.
 ECM detects that input signal from the ASCD steer- ing switch is out of the specified range.
 ECM detects that the ASCD steering switch is stuck ON.  Harness or connectors
(The switch circuit is open or
shorted.)
 ASCD steering switch
 Combination meter (spiral cable)
ECM
Revision: December 20092009 QX56

P1564 ASCD STEERING SWITCHEC-329
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Refer to
EC-85, "Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT-IIl
1. Turn ignition switch ON.
2. Select “MAIN SW”, “CANCEL SW”, RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with
CONSULT-IIl.
3. Check each item indication under the following conditions.
Without CONSULT-IIl
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 99 and ground with press- ing each button.
OK or NG
OK >> GO TO 8.
NG >> GO TO 3.
3.CHECK ASCD STEERING SWITCH GRO UND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
BBIA0354E
Switch Monitor item Condition Indication
MAIN switch MAIN SW Pressed ON
Released OFF
CANCEL switch CANCEL SW Pressed ON
Released OFF
RESUME/ACCELERATE
switch RESUME/ACC SWPressed ON
Released OFF
SET/COAST switch SET SW Pressed ON
Released OFF
Switch Condition Voltage [V]
MAIN switch Pressed Approx. 0
Released Approx. 4
CANCEL switch Pressed Approx. 1
Released Approx. 4
RESUME/ACCELERATE
switch Pressed Approx. 3
Released Approx. 4
SET/COAST switch Pressed Approx. 2
Released Approx. 4
PBIB0311E
Revision: December 20092009 QX56

EC-332
< COMPONENT DIAGNOSIS >[VK56DE]
P1568 ICC FUNCTION
P1568 ICC FUNCTION
On Board Diagn
osis LogicINFOID:0000000003771635
This self-diagnosis has the one trip detection logic.
 The MIL will not light up for this self-diagnosis.
NOTE:
 If DTC P1568 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-86, "On Board Diagnosis Logic"
.
 If DTC P1568 is displayed with DTC P0607, first pe rform the trouble diagnosis for DTC P0607. Refer
to EC-284, "On Board Diagnosis Logic"
.
 If DTC P1568 is displayed with DTC P0605, first pe rform the trouble diagnosis for DTC P0605. Refer
to EC-282, "On Board Diagnosis Logic"
.
DTC Confirmation ProcedureINFOID:0000000003771636
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Step 4 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test
is expected to be easier, it is unnecessary to lift the vehicle.
1. Turn ignition switch ON.
2. Press MAIN switch on ICC steering switch.
3. Drive the vehicle at more than 40 km/h (25 MPH).
4. Press SET/COAST switch.
5. Check DTC.
6. If DTC is detected, go to EC-332, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771637
1.REPLACE ICC UNIT
1. Replace ICC unit.
2. Perform CCS-8
.
3. Check DTC of ICC unit. Refer to CCS-18
.
>> INSPECTION END
DTC No. Trouble Diagnosis
Name DTC Detecting Condit
ion Possible Cause
P1568
1568 ICC function
ECM detects a difference between signals
from ICC unit is out of specified range.  Harness or connectors
(The CAN communication line is open or
shorted.)
 ICC unit
ECM
Revision: December 20092009 QX56

P1572 ICC BRAKE SWITCHEC-333
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P1572 ICC BRAKE SWITCH
Component DescriptionINFOID:0000000003771638
When the brake pedal is depressed, ICC brake switch is turned OFF
and stop lamp switch is turned ON. ECM detects the state of the
brake pedal by this input of two kinds (ON/OFF signal).
Refer to
CCS-13
for the ICC function.
On Board Diagnosis LogicINFOID:0000000003771639
This diagnosis has the on e trip detection logic.
 The MIL will not light up for this self-diagnosis.
NOTE:
 If DTC P1572 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-282, "On Board Diagnosis Logic"
.
 This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when igniti on switch OFF. And even when ma lfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation ProcedureINFOID:0000000003771640
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
 Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for
malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
 If DTC Confirmation Procedure has been previously c onducted, always perform the following before con-
ducting the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Steps 4 and 7 may be conducted with the drive wheels li fted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
1. Start engine (VDC switch OFF).
2. Select “DATA MONITOR” mode with CONSULT-IIl.
3. Press MAIN switch and make sure that CRUISE lamp lights up.
4. Drive the vehicle for at least 5 consec utive seconds under the following conditions.
BBIA0470E
DTC No.Trouble diagnosis
name DTC detecting condition Possible cause
P1572
1572 ICC brake switch A)
When vehicle speed is above 30 km/h (19
MPH), ON signals from the stop lamp
switch and the ICC brake switch are sent to
ECM at the same time.  Harness or connectors
(The stop lamp switch circuit is shorted.)
 Harness or connectors
(The ICC brake switch circuit is shorted.)
Stop lamp switch
 ICC brake switch
 ICC brake hold relay
 Incorrect stop lamp switch installation
 Incorrect ICC brake switch installation
ECM
B)
ICC brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
Revision: December 20092009 QX56