2001 Infiniti QX4 Service Bulletins

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2001 QX4

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ITB09-012a

-REVISED-
1998-LATER ALL INFINITI MODELS; EVAP LEAK DTC DIAGNOSIS
Evap system leak detection diagnosis.
DTCs: P0440, P0442, P0455, P0456, P1440, and P1456

Discussion Thread

03-05-2010
192.05 Kbytes Hits 636
Keywords: small p1440 p0455 p0440 leak p1456 p0456 p0442 mil dtc

ITB06-023a

-REVISED-
1997-2008 ALL INFINITI; DTC FOR VARIABLE VALVE TIMING CONTROL FUNCTION
The MIL is on with any of the following DTCs stored: P0011, P0014, P0021, P0024, P1110, P1135.
NOTE: The engine may also have Camshaft Sprocket rattle noise and/or other engine noise.

01-25-2008
54.83 Kbytes Hits 867
Keywords: p1135 p0024 p0014 mil p1110 p0021 p0011 dtc

ITB02-050a

-REVISED-

2001 INFINITI QX4 MIL ‘ON’ WITH DTC P0420/P0430 BANK-1/BANK-2 CATALYST

If an applied 2001 QX4 has a MIL "ON" and either or both of the following DTCs stored in the ECM:

• P0420

• P0430

01-23-2003
127.22 Kbytes Hits 87
Keywords: dtc mil p0420 p0430 catalyst

ITB02-015

1998-2002 ALL INFINITI MODELS; DTC 1491 (VACUUM CUT VALVE BYPASS VALVE)
DIAGNOSIS
This bulletin is an aid to the diagnostic procedures in the Service Manual for DTC P1491.

03-22-2002
117.63 Kbytes Hits 176
Keywords: dtc mil p1491

ITB02-002

2001 INFINITI QX4; MIL ‘ON’ WITH REAR OXYGEN SENSOR DTC

PO138-P0140 OR P0158-P0160 STORED

If an applied vehicle has a MIL ‘ON’ with one of the following DTCs stored:

• P0138

• P0139

• P0140

• P0158

• P0159

• P0160

The cause may be a broken or cracked rear oxygen sensor element.

01-16-2002
89.96 Kbytes Hits 50
Keywords: dtc mil p0139 p0140 p0158 p0159 p0160 po138

ITB00-045b

-REVISED-

2001 QX4; MIL "ON" DTC P1441 (EVAP VERY SMALL LEAK) STORED IN SELF DIAGNOSIS RESULTS

If an applied vehicle has a MIL "ON" with DTC P1441 (EVAP Very Small Leak) stored in Engine Self Diagnosis results, the cause may be the ECM program.

01-06-2001
91.79 Kbytes Hits 9
Keywords: dtc evap mil p1441

ITB00-046

1996 AND UP ALL INFINITI MODELS; EVAP VENT CONTROL VALVE DIAGNOSTICS

If an applied vehicle has one (or more) of the following DTCs stored in Self Diagnosis, use the Service Procedure below to check the operation of the EVAP vent control valve.

07-18-2000
102.17 Kbytes Hits 161
Keywords: valve vent mil evap dtc

ITB00-030

2000 INFINITI I30, G20, 2001 QX4;

DTC P0505 DUE TO INCORRECT IDLE SPEED

If one of the Applied Vehicles above has a Diagnostic Trouble Code (DTC) P0505 AAC/V stored, with no

customer driveability incident, it may be caused by an elevated or incorrect engine idle speed setting.

05-02-2000
95.54 Kbytes Hits 59
Keywords: dtc idle mil p0505

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