Infiniti QX56 (Z62). Manual — part 552
EC-186
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0037, P0038, P0057, P0058 HO2S2 HEATER
Component Inspection (HO2 Sensor 2 Heater)
INFOID:0000000006217780
1.
CHECK HEATED OXYGEN SENSOR 2 HEATER
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
3.
Check resistance between HO2S2 terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2. Refer to
EX-5, "Removal and Installation"
CAUTION:
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
>> INSPECTION END
Terminal
Resistance
2 and 3
3.4 - 4.4
Ω
[at 25
°
C (77
°
F)]
1 and 2, 3, 4
∞
Ω
(Continuity should not exist)
4 and 1, 2, 3
P006A, P0101 MAF SENSOR
EC-187
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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P006A, P0101 MAF SENSOR
DTC Logic
INFOID:0000000006288269
DTC DETECTION LOGIC
NOTE:
If DTC P006A or P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1.
Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2.
Start engine and warm it up to normal operating temperature.
3.
Accelerate the vehicle from 0 km/h (0 MPH) to 88 km/h (55 MPH) under the following conditions:
CAUTION:
Always drive at a safe speed.
NOTE:
• Accelerate with the accelerator pedal kept constant.
• The acceleration at engine speed 2,000 and 3,000 rpm allows easy diagnoses
4.
Check 1st trip DTC.
WITHOUT CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
With selector lever in D position, accelerate the vehicle from 0 km/h (0 MPH) to 88 km/h (55 MPH) under
the following conditions:
NOTE:
• Accelerate with the accelerator pedal kept constant.
• The acceleration at engine speed 2,000 and 3,000 rpm allows easy diagnoses.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P006A
MAP-MAF CORELTION-B1
(Manifold pressure - mass air
flow correlation)
A difference exceeding the specified value develops
between a value transmitted from the manifold absolute
pressure sensor to ECM and an estimated intake pres-
sure of intake manifold calculated by ECM, based on a
mass sir flow sensor signal.
• Harness or connectors
(The sensor circuit is open
or shorted.)
• Mass air flow sensor
• Manifold absolute pressure
sensor
• EVAP control system pres-
sure sensor
• Intake air leaks
• Intake air temperature sen-
sor
P0101
MAF SEN/CIRCUIT-B1
(Mass air flow sensor circuit
range/performance)
A difference exceeding the specified value develops
between a signal transmitted from the mass air flow
sensor to ECM.
Mass air flow sensor
ACCEL SEN 1
1.4 – 2.0 V
Selector lever
D position
EC-188
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P006A, P0101 MAF SENSOR
CAUTION:
Always drive at a safe speed.
3.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006288270
1.
CHECK INTAKE SYSTEM
Check the following for connection.
• Air duct
• Vacuum hoses
• Intake air passage between air duct and intake manifold
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Reconnect the parts.
2.
CHECK MASS AIR FLOW SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect mass air flow sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between mass air flow sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between mass air flow sensor and ECM
• Harness for open or short between mass air flow sensor and IPDM E/R
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK MASS AIR FLOW SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between mass air flow sensor harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Accelerator pedal position sensor 1
Ground
Voltage (V)
Connector
Terminal
E110 (Whthout ICC)
3
Ground
1.4 – 2.0
E67 (With ICC)
10
Mass air flow sensor
Ground
Voltage
Connector
Terminal
F31
5
Ground
Battery volt-
age
Mass air flow sensor
ECM
Continu-
ity
Connec-
tor
Terminal
Connec-
tor
Terminal
F31
4
F111
25
Existed
P006A, P0101 MAF SENSOR
EC-189
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK MASS AIR FLOW SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between mass air flow sensor harness connector and ECM harness connector.
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK MANIFOLD ABSOLUTE PRESSURE SENSOR
Check manifold absolute pressure sensor. Refer to
EC-208, "Component Inspection (MAP Sensor)"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace manifold absolute pressure sensor. Refer to
EM-30, "Removal and Installation"
.
7.
CHECK INTAKE AIR TEMPERATURE SENSOR
Check intake air temperature sensor. Refer to
EC-225, "Component Inspection (Intake Air Temperature Sen-
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-335, "Component Inspection (EVAP Control System Pressure Sensor)"
.
Is the inspection result normal?
YES-1 (Only DTC P006A is detected)>>GO TO 9.
YES-2 (DTC P006A and P0101 are detected)>>GO TO 10.
NO
>> Replace EVAP control system pressure sensor. Refer to
FL-12, "Removal and Installation"
.
9.
CHECK MASS AIR FLOW SENSOR
EC-190, "Component Inspection (MAF Sensor)"
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace mass air flow sensor.
10.
CHECK MASS AIR FLOW SENSOR
Check mass air flow sensor. Refer to
EC-190, "Component Inspection (MAF Sensor)"
.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace mass air flow sensor. Refer to
EM-27, "Removal and Installation"
.
11.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Mass air flow sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F31
3
F111
22
Existed
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