2009 INFINITI QX56 key

EC-80
< COMPONENT DIAGNOSIS >[VK56DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
2. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.
>> GO TO 22.
22.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1. Start engine.
2. Select “A/F ALPHA-B1”, “A/F AL PHA-B2” in “SPEC” of “DATA MONITOR” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK >> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to EC-109 .
2. GO TO 29.
NG >> GO TO 23.
23.CHECK “MAS A/F SE-B1”
Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
OK or NG
OK >> GO TO 24.
NG (More than the SP value)>>Replace mass air flow sensor, and then GO TO 29.
24.REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS(NAT S) system and registration of all IVIS(NATS) ignition key IDs. Refer to
SEC-6, "ECM RE-COMMUNICATING FUNCT ION : Special Repair Requirement"
.
3. Perform EC-17, "VIN Registration"
.
4. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
5. Perform EC-18, "Throttle Valve Closed Position Learning"
.
6. Perform EC-18, "Idle Air Volume Learning"
.
>> GO TO 29.
25.CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
 Crushed air ducts
 Malfunctioning seal of air cleaner element
 Uneven dirt of air cleaner element
 Improper specification of intake air system
OK or NG
OK >> GO TO 27.
NG >> Repair or replace malfunctioning part, and then GO TO 26.
26.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
OK or NG
OK >> INSPECTION END
NG (Less than the SP value)>>GO TO 27.
27.CHECK “MAS A/F SE-B1”
Select “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the
SP value.
OK or NG
OK >> GO TO 28.
NG (Less than the SP value)>>Replace mass air flow sensor, and then GO TO 30.
28.CHECK INTAKE SYSTEM
Check for the cause of air leak after the mass air flow sensor. Refer to the following.
Revision: December 20092009 QX56

P0506 ISC SYSTEMEC-273
< COMPONENT DIAGNOSIS > [VK56DE]
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P0506 ISC SYSTEM
DescriptionINFOID:0000000003771546
NOTE:
If DTC P0506 is displayed with ot
her DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified leve l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is t he lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan
operation, etc.).
On Board Diagnosis LogicINFOID:0000000003771547
DTC Confirmation ProcedureINFOID:0000000003771548
NOTE:
 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.
 If the target idle speed is ou t of the specified value, perform EC-18, "Idle Air Volume Learning"
,
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-495, "Idle
Speed and Ignition Timing".
TESTING CONDITION:
 Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
 Always perform the test at a temperature above −10 °C (14 °F).
1. Open engine hood.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and run it for at least 1 minute at idle speed.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-273, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771549
1.CHECK INTAKE AIR LEAK
1. Start engine and let it idle.
2. Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 2.
NG >> Discover air leak location and repair.
2.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Perform initialization of IVIS(NATS) system and regist ration of all IVIS(NATS) ignition key IDs. Refer to
SEC-6, "ECM RE-COMMUNICATING FUNCT ION : Special Repair Requirement"
.
4. Perform EC-17, "VIN Registration"
.
5. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0506
0506 Idle speed control system
RPM lower than expected The idle speed is less than the target idle speed
by 100 rpm or more.  Electric throttle control actuator
 Intake air leak
Revision: December 20092009 QX56

EC-276
< COMPONENT DIAGNOSIS >[VK56DE]
P0507 ISC SYSTEM
3.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Perform initialization of IVIS(NAT S) system and registration of all IVIS(NATS) ignition key IDs. Refer to
SEC-6, "ECM RE-COMMUNICATING FUNCT ION : Special Repair Requirement"
.
4. Perform EC-17, "VIN Registration"
.
5. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
6. Perform EC-18, "Throttle Valve Closed Position Learning"
.
7. Perform EC-18, "Idle Air Volume Learning"
.
>> INSPECTION END
Revision: December 20092009 QX56

P0603 ECM POWER SUPPLYEC-281
< COMPONENT DIAGNOSIS > [VK56DE]
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3. Check voltage between ECM terminal 121 and ground with
CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
 IPDM E/R connector E121
 20A fuse
 Harness for open or short between ECM and battery
>> Repair or replace harness or connectors.
3.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness or connectors.
4.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-III.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-280, "DTC Logic"
.
5. Is the 1st trip DTC P0603 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC Confirmation Procedure.
See EC-280, "DTC Logic"
.
4. Is the 1st trip DTC P0603 displayed again?
Ye s o r N o
Yes >> GO TO 5.
No >> INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS(NATS) system and regist ration of all IVIS(NATS) ignition key IDs. Refer to
SEC-6, "ECM RE-COMMUNICATING FUNCT ION : Special Repair Requirement"
.
3. Perform EC-17, "VIN Registration"
.
4. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
5. Perform EC-18, "Throttle Valve Closed Position Learning"
.
6. Perform EC-18, "Idle Air Volume Learning"
.
>> INSPECTION END
Voltage: Battery voltage
MBIB0026E
Revision: December 20092009 QX56

P0605 ECMEC-283
< COMPONENT DIAGNOSIS > [VK56DE]
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3. Repeat step 2 for 32 times.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to
EC-283, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771566
1.INSPECTION START
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-III.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-282, "DTC Confirmation Procedure"
.
5. Is the 1st trip DTC P0605 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC Confirmation Procedure.
See EC-282, "DTC Confirmation Procedure"
.
4. Is the 1st trip DTC P0605 displayed again?
Ye s o r N o
Yes >> GO TO 2.
No >> INSPECTION END
2.REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS(NATS) system and regist ration of all IVIS(NATS) ignition key IDs. Refer to
SEC-6, "ECM RE-COMMUNICATING FUNCT ION : Special Repair Requirement"
.
3. Perform EC-17, "VIN Registration"
.
4. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
5. Perform EC-18, "Throttle Valve Closed Position Learning"
.
6. Perform EC-18, "Idle Air Volume Learning"
.
>> INSPECTION END
Revision: December 20092009 QX56

EC-284
< COMPONENT DIAGNOSIS >[VK56DE]
P0607 ECM
P0607 ECM
DescriptionINFOID:0000000003771330
CAN (Controller Area Network) is a serial communication
line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication s peed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CA N communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
On Board Diagn osis LogicINFOID:0000000003771331
This self-diagnosis has the one trip detection logic.
DTC Confirmation ProcedureINFOID:0000000003771332
1. Turn ignition switch ON.
2. Check DTC.
3. If DTC is detected, go to EC-284, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771333
1.INSPECTION START
With CONSULT-III
1. Turn ignition switch ON.
2. Select “SELF-DIAG RESULTS” mode with CONSULT-III.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-284, "DTC Confirmation Procedure"
.
5. Is the DTC P0607 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC Confirmation Procedure.
See EC-284, "DTC Confirmation Procedure"
.
4. Is the DTC P0607 displayed again?
Ye s o r N o
Ye s > > G O T O 2 .
No >> INSPECTION END
2.REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and regist ration of all IVIS (NATS) ignition key IDs. Refer to
SEC-6, "ECM RE-COMMUNICATING FUNCT ION : Special Repair Requirement"
.
3. Perform EC-17, "VIN Registration"
.
4. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
5. Perform EC-18, "Throttle Valve Closed Position Learning"
.
6. Perform EC-18, "Idle Air Volume Learning"
.
>> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0607
0607 CAN communication bus When detecting error during the initial diagno-
sis of CAN controller of ECM.
ECM
Revision: December 20092009 QX56

P1421 COLD START CONTROLEC-307
< COMPONENT DIAGNOSIS > [VK56DE]
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OK or NG
OK >> GO TO 4.
NG >> Go to
EC-170, "Diagnosis Procedure"
.
4.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-IIl
1. Turn ignition switch ON.
2. Select “SELF DIAG RESULTS” mode with CONSULT-IIl.
3. Touch “ERASE”.
4. Perform DTC Confirmation Procedure.
See EC-306, "DTC Confirmation Procedure"
.
5. Is the 1st trip DTC P1421 displayed again?
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC Confirmation Procedure.
See EC-306, "DTC Confirmation Procedure"
.
4. Is the 1st trip DTC P1421 displayed again?
Ye s o r N o
Yes >> GO TO 5.
No >> INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs.
Refer to SEC-6, "ECM RE-COMMUNI CATING FUNCTION : Special Repair Requirement"
.
3. Perform EC-17, "VIN Registration"
.
4. Perform EC-18, "Accelerator Pedal Released Position Learning"
.
5. Perform EC-18, "Throttle Valve Closed Position Learning"
.
6. Perform EC-18, "Idle Air Volume Learning"
.
>> INSPECTION END
Revision: December 20092009 QX56

ECM
EC-459
< ECU DIAGNOSIS > [VK56DE]
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OOUTPUT SPEED SENSOR*6P0720 0720 — 2
×TM-49
1GR INCORRECT RATIO P0731 0731 — 2 ×TM-54
2GR INCORRECT RATIO P0732 0732 — 2 ×TM-56
3GR INCORRECT RATIO P0733 0733 — 2 ×TM-58
4GR INCORRECT RATIO P0734 0734 — 2 ×TM-60
5GR INCORRECT RATIO P0735 0735 — 2 ×TM-62
TORQUE CONVERTER P0740 0740 — 2 ×TM-64
TORQUE CONVERTER P0744 0744 — 2 ×TM-66
PC SOLENOID A P0745 0745 — 2 ×TM-68
P-N POS SW/CIRCUIT P0850 0850 — 2 ×EC-288
INTK TIM S/CIRC-B1 P1140 1140 — 2 ×EC-291
INTK TIM S/CIRC-B2 P1145 1145 — 2 ×EC-291
CLOSED LOOP-B1 P1148 1148 — 1 ×EC-295
CLOSED LOOP-B2 P1168 1168 — 1 ×EC-295
TCS C/U FUNCTN P1211 1211 — 2 — EC-296
TCS/CIRC P1212 1212 — 2 —EC-297
ENG OVER TEMP P1217 1217 — 1×EC-36
CTP LEARNING-B1 P1225 1225 — 2 — EC-302
CTP LEARNING-B1 P1226 1226 — 2 —EC-304
COLD START CONTROL P1421 1421 — 2×EC-306
BAT CURRENT SENSOR P1550 1550 — 2 — EC-308
BAT CURRENT SENSOR P1551 1551 — 2 —EC-312
BAT CURRENT SENSOR P1552 1552 — 2 —EC-312
BAT CURRENT SENSOR P1553 1553 — 2 —EC-316
BAT CURRENT SENSOR P1554 1554 — 2 —EC-320
ASCD SW P1564 1564 — 1 —EC-324

(Models
with ICC) EC-328

(Models
with ASCD)
ICC COMMAND VALUE*
9P1568 1568 — 1 — EC-332
ASCD BRAKE SW P1572 1572 — 1 — EC-333

(Models
with ICC) EC-339

(Models
with ASCD)
ASCD VHL SPD SEN*
8P1574 1574 — 1 — EC-344

(Models
with ICC)
EC-346

(Models
with ASCD)
ID DISCARD IMM-ECM P1611 1611 — 2 — SEC-37
CHAIN OF ECM-IMMU P1612 1612 — 2 —SEC-33
CHAIN OF IMMU-KEY P1614 1614 — 2 —SEC-27
Items
(CONSULT-IIl screen terms) DTC*
1
SRT code Trip MIL
Reference
page
CONSULT-IIl
GST*
2ECM*3
Revision: December 20092009 QX56