Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2008FX45 AWD V8-4.5L (VK45DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESTROUBLE DIAGNOSIS - SPECIFICATION VALUE
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)
Trouble Diagnosis - Specification Value
2008 Infiniti FX45 AWD V8-4.5L (VK45DE)SECTION Trouble Diagnosis - Specification Value
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Description
The specification (SP) value indicates the tolerance of the value that is displayed in "SPEC" of "DATA MONITOR" mode with CONSULT-III during normal operation of the Engine Control System. When the value in "SPEC" of "DATA MONITOR" mode is within the SP value, the Engine Control System is confirmed OK. When the value in "SPEC" of "DATA MONITOR" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the MIL.
The SP value will be displayed for the following three items:
- B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correction)
- A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
- MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Testing Condition
- Vehicle driven distance: More than 5,000 km (3,107 miles)
- Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/sq.cm, 14.25 - 15.12 psi)
- Atmospheric temperature: 20 - 30 °C (68 - 86 °F)
- Engine coolant temperature: 75 - 95 °C (167 - 203 °F)
- Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until "[1][2]ATF TEMP SE 1" (A/T fluid temperature sensor signal) indicates more than 60 °C (140 °F).
- Electrical load: Not applied
- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight ahead.
- Engine speed: Idle
Inspection Procedure
NOTE: Perform "SPEC" in "DATA MONITOR" mode in maximum scale display.
1. Perform EC-658, "Basic Inspection". Basic Inspection
2. Confirm that the testing conditions indicated above are met.
3. Select "B/FUEL SCHDL", "A/F ALPHA-B1", "A/F ALPHA-B2" and "MAS A/F SE-B1" in "SPEC" of "DATA MONITOR" mode with CONSULT-III.
4. Make sure that monitor items are within the SP value.
5. If NG, go to "Diagnosis Procedure".
Diagnosis Procedure
OVERALL SEQUENCE
DETAILED PROCEDURE
Description
The specification (SP) value indicates the tolerance of the value that is displayed in "SPEC" of "DATA MONITOR" mode with CONSULT-III during normal operation of the Engine Control System. When the value in "SPEC" of "DATA MONITOR" mode is within the SP value, the Engine Control System is confirmed OK. When the value in "SPEC" of "DATA MONITOR" mode is NOT within the SP value, the Engine Control System may have one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the MIL.
The SP value will be displayed for the following three items:
- B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correction)
- A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
- MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Testing Condition
- Vehicle driven distance: More than 5,000 km (3,107 miles)
- Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/sq.cm, 14.25 - 15.12 psi)
- Atmospheric temperature: 20 - 30 °C (68 - 86 °F)
- Engine coolant temperature: 75 - 95 °C (167 - 203 °F)
- Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until "[1][2]ATF TEMP SE 1" (A/T fluid temperature sensor signal) indicates more than 60 °C (140 °F).
- Electrical load: Not applied
- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight ahead.
- Engine speed: Idle
Inspection Procedure
NOTE: Perform "SPEC" in "DATA MONITOR" mode in maximum scale display.
1. Perform EC-658, "Basic Inspection". Basic Inspection
2. Confirm that the testing conditions indicated above are met.
3. Select "B/FUEL SCHDL", "A/F ALPHA-B1", "A/F ALPHA-B2" and "MAS A/F SE-B1" in "SPEC" of "DATA MONITOR" mode with CONSULT-III.
4. Make sure that monitor items are within the SP value.
5. If NG, go to "Diagnosis Procedure".
Diagnosis Procedure
OVERALL SEQUENCE
DETAILED PROCEDURE
Step 1:
Step 1 (Continued)-7:
Step 7 (Continued)-14:
Step 14 (Continued)-21:
Step 21 (Continued)-28:
Step 28 (Continued)-30:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.