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-DATSUN2012ALTIMA BASEREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (INTRODUCTION) (QR25DE FOR MEXICO)
2012 Nissan-Datsun Altima Base
Engine Control System (Introduction) (Qr25DE For MEXICO)
2012 Nissan-Datsun Altima BaseSECTION Engine Control System (Introduction) (Qr25DE For MEXICO)
- How To Use This Information
- Precaution
- Preparation
- System Description
- Engine Control System
- MULTIPORT Fuel Injection System
- Electric Ignition System
- Air Conditioning Cut Control
- Automatic Speed Control Device (ASCD)
- Can Communication
- Cooling Fan Control
- Evaporative Emission System
- Intake Valve Timing Control
- On Board Diagnostic (OBD) System
- Diagnosis System (ECM)
- Diagnosis Description
- DIAGNOSIS DESCRIPTION: 1st Trip Detection Logic and Two Trip Detection Logic
- DIAGNOSIS DESCRIPTION: DTC and Freeze Frame Data
- DIAGNOSIS DESCRIPTION: Counter System
- Relationship Between Mil, 1ST Trip DTC, DTC, And Detectable Items
- Counter System Chart
- Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for "Misfire <EXHAUST Quality Deterioration>", "Fuel Injection System"
- Explanation for Driving Patterns for "Misfire <EXHAUST Quality Deterioration>", "Fuel Injection System"
- Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns Except For "Misfire <EXHAUST Quality Deterioration>", "Fuel Injection System"
- Explanation for Driving Patterns Except for "Misfire <EXHAUST Quality Deterioration>", "Fuel Injection System"
- DIAGNOSIS DESCRIPTION: Driving Pattern
- DIAGNOSIS DESCRIPTION: System Readiness Test (SRT) Code
- DIAGNOSIS DESCRIPTION: Malfunction Indicator Lamp (MIL)
- On Board Diagnosis Function
- CONSULT Function
- Diagnosis Description
- Ecu Diagnosis Information
- Wiring Diagram
- Basic Inspection
- Diagnosis And Repair Work Flow
- Inspection And Adjustment
- How To Set SRT Code
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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.