2005 INFINITI QX4 Factory Service Manual

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Page 1273 of 3419

INFINITI QX4 2005 Factory Service Manual EC-82Revision: October 2005
BASIC SERVICE PROCEDURE
2005 QX56
3. CHECK TARGET IDLE SPEED
With CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no load.
2. Rev engine (2,000 to 3,

Page 1274 of 3419

INFINITI QX4 2005 Factory Service Manual BASIC SERVICE PROCEDURE
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6. PERFORM IDLE AIR VOLUME LEARNING
Perform EC-91, "
Idle Air Volume Learning" .
Is Idle Air Volume Learning car

Page 1275 of 3419

INFINITI QX4 2005 Factory Service Manual EC-84Revision: October 2005
BASIC SERVICE PROCEDURE
2005 QX56
10. CHECK IGNITION TIMING
1. Run engine at idle.
2. Check ignition timing with a timing light.
Refer to EC-77, "
IGNITION TIMING" .
OK or

Page 1276 of 3419

INFINITI QX4 2005 Factory Service Manual BASIC SERVICE PROCEDURE
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15. CHECK IGNITION TIMING AGAIN
1. Run engine at idle.
2. Check ignition timing with a timing light.
Refer to EC

Page 1277 of 3419

INFINITI QX4 2005 Factory Service Manual EC-86Revision: October 2005
BASIC SERVICE PROCEDURE
2005 QX56
19. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT-II
1. Turn ignition switch OFF and wait at a least 10 seconds.
2. Start eng

Page 1278 of 3419

INFINITI QX4 2005 Factory Service Manual BASIC SERVICE PROCEDURE
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21. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HARNESS
1. Turn ignition switch OFF and disconnect battery ground cable.

Page 1279 of 3419

INFINITI QX4 2005 Factory Service Manual EC-88Revision: October 2005
BASIC SERVICE PROCEDURE
2005 QX56
25. CHECK CO%
With CONSULT-II
1. Start engine and warm it up until engine coolant temperature indicator points the middle of gauge.
2. Tu

Page 1280 of 3419

INFINITI QX4 2005 Factory Service Manual BASIC SERVICE PROCEDURE
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29. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT-II
1. Turn ignition switch OFF and wait at a leas

BASIC SERVICE PROCEDURE
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Revision: October 20052005 QX56
29. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With CONSULT-II
1. Turn ignition switch OFF and wait at a least 10 seconds.
2. Start engine and warm it up to normal operating temperature.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position.
NOTE:
Keep the accelerator pedal as steady as possible during the cruising.
4. Release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
NOTE:
Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 for 5 times.
6. Stop the vehicle and connect CONSULT-II to the vehicle.
7. Make sure that no (1st trip) DTC is displayed in “SELF-DIAG RESULTS” mode.
OK or NG
OK >> GO TO 4.
NG >> GO TO 31.
30. CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
With GST
1. Turn ignition switch OFF and wait at a least 10 seconds.
2. Start engine and warm it up to normal operating temperature.
3. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in D position.
NOTE:
Keep the accelerator pedal as steady as possible during the cruising.
4. Release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
NOTE:
Never apply brake during releasing the accelerator pedal.
5. Repeat steps 3 to 4 for 5 times.
6. Stop the vehicle and connect GST to the vehicle.
7. Make sure that no (1st trip) DTC is displayed.
OK or NG
OK >> GO TO 4.
NG >> GO TO 31.
31. DETECT MALFUNCTIONING PART
Check the following.
Check fuel pressure regulator, and repair or replace if necessary. Refer to EC-93, "Fuel Pressure Check" .
Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to EC-174, "DTC
P0101 MAF SENSOR" and EC-183, "DTC P0102, P0103 MAF SENSOR" .
Check injector and its circuit, and repair or replace if necessary. Refer to EC-631, "INJECTOR CIRCUIT" .
Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to EC-
195, "DTC P0117, P0118 ECT SENSOR" and EC-208, "DTC P0125 ECT SENSOR" .
OK or NG
OK >> GO TO 33.
NG >> 1. Repair or replace.
2. GO TO 32.

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