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 MANUALSNISSAN-DATSUN2003FRONTIER BASE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0400: EGR FUNCTIONDTC CONFIRMATION TEST (USING CONSULT-II)
2003 Nissan-Datsun Frontier Base, Standard
DTC Confirmation Test (Using CONSULT-II)
2003 Nissan-Datsun Frontier Base, StandardSECTION DTC Confirmation Test (Using CONSULT-II)
- Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
- Ensure COOLAN TEMP/S is less than 104°F (40°C). Allow engine to cool as necessary. Do not attempt to lower coolant temperature with a fan or means other than ambient air.
- Start engine and let it idle. When COOLAN TEMP/S value reaches 158°F (70°C), immediately go to next step.
- Select EGR SYSTEM P0400 of EGR SYSTEM in DTC WORK SUPPORT mode with CONSULT-II.
- Press START. Accelerate vehicle to a speed of 25 MPH once, and then stop vehicle with engine running. If COMPLETED is displayed, go to step 8 . If COMPLETED is not displayed, go to next step.
- Using CONSULT-II, check THRTL POS SEN output voltage with throttle closed and note it.
- When the following conditions are met, TESTING will be displayed. Maintain conditions until TESTING changes to COMPLETED (it will take 30 seconds or more).
2.4L
- ENG SPEED: 2000-2800 RPM.
- Vehicle speed: 6 MPH or more.
- B/FUEL SCHDL: 7-10 msec.
- THRTL POS SEN: (X + 0.23) - (X + 0.74) volts (X = voltage measured at step 6 ).
3.3L
- ENG SPEED: 1600-2400 RPM (A/T models), or 1800-2600 RPM (M/T models).
- B/FUEL SCHDL: 6-9 msec.
- THRTL POS SEN: X - (X + 0.82) volts (X = voltage measured at step 6 ).
NOTE: On all models, if TESTING is not displayed after 5 minutes, retry from step 2 . - Press SELF-DIAG RESULTS. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time.
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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.