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 P0121, DTC P0122 OR DTC P0123DTC CONFIRMATION TEST "MALFUNCTION B"
2003 Nissan-Datsun Frontier Base, Standard
DTC Confirmation Test "Malfunction B"
2003 Nissan-Datsun Frontier Base, StandardSECTION DTC Confirmation Test "Malfunction B"
- Start engine and warm to normal operating temperature. Turn ignition off and wait at least 5 seconds. Turn ignition on. Select MANU TRIG and HI SPEED in DATA MONITOR mode with scan tool.
- Select THRTL POS SEN and ABSOL TH-P/S. Press RECORD. Slowly depress accelerator pedal to wide open throttle. Voltage rise should be linear in response to throttle opening, and voltage should be about 4 volts at wide open throttle.
- If voltage is as specified, go to next step. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE.
- Select AUTO TRIG on scan tool. Maintain the following conditions for at least 10 consecutive seconds:
- ENG SPEED: more than 2000 RPM.
- MAS AIR/FL SE: more than 3 volts.
- COOLAN TEMP/S: more than 158°F (70°C).
- Drive vehicle uphill (increased engine load) to help maintain conditions required for test.
- If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.
RENDER: 1.0x
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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.