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.
2003 Infiniti I35FACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- On-Board Diagnostics
- Freeze-Frame Data
- Testing Procedure
- Retrieving Diagnostic Trouble Codes
- Clearing Diagnostic Trouble Codes
- Fail-Safe Modes
- Notes
- DTC P0102, DTC P0103 & DTC P1102: MAF Sensor
- DTC P0117 & DTC P0118: ECT Sensor
- DTC P0221, DTC P0222, DTC P0223, DTC P1223 & DTC P1224: TP Sensor
- DTC P0226, DTC P0227, DTC P0228, DTC P1227 & DTC P1228: Accelerator Pedal Position Sensor
- DTC P1121: Electric Throttle Control Actuator (ECM Detects Throttle Valve Is Stuck Open)
- DTC P1122: Electric Throttle Control Function
- DTC P1126: Throttle Control Relay
- DTC P1129: Sensor Power Supply
- ECM (DTCs Not Accessible)
- Engine Control Module Location
- Scan Tool Usage
- Programming
- Drive Cycles
- Summary
- Diagnostic Trouble Code Definitions
- Connector Identification
- Diagnostic Tests
- DTC P0011: Intake Valve Timing (IVT) Control Performance - Bank 1 Or DTC P0021: Intake Valve Timing (IVT) Control Performance - Bank 2
- DTC P0031, DTC P0032, DTC P0051 Or DTC P0052
- DTC P0037, DTC P0038, DTC P0057 Or DTC P0058
- DTC P0101: Mass Airflow Sensor Circuit Range/Performance Problem
- DTC P0102: Mass Airflow Sensor Circuit Low Input Or DTC P0103: Mass Airflow Sensor Circuit High Input
- DTC P0107: Absolute Pressure Sensor Circuit Low Input Or DTC P0108: Absolute Pressure Sensor Circuit High Input
- DTC P0112: Intake Air Temperature Sensor Circuit Low Input Or DTC P0113: Intake Air Temperature Sensor Circuit High Input
- DTC P0117: Engine Coolant Temperature Sensor Circuit Low Input Or DTC P0118: Engine Coolant Temperature Sensor Circuit High Input
- DTC P0122: Throttle Position Sensor 2 Circuit Low Input Or DTC P0123: Throttle Position Sensor 2 Circuit High Input
- DTC P0125: Insufficient Engine Coolant Temperature For Closed Loop Fuel Control
- DTC P0127: Intake Air Temperature Too High
- DTC P0128: Thermostat Function
- DTC P0132: Ho2S1 Circuit High Voltage - Bank 1 Or DTC P0152: Ho2S1 Circuit High Voltage - Bank 2
- DTC P0133: Ho2S1 Circuit Slow Response - Bank 1 Or DTC P0153: Ho2S1 Circuit Slow Response - Bank 2
- DTC P0134: Ho2S1 Circuit No Activity Detected - Bank 1 Or DTC P0154: Ho2S1 Circuit No Activity Detected - Bank 2
- DTC P0138: Ho2S2 Circuit High Voltage - Bank 1 Or DTC P0158: Ho2S2 Circuit High Voltage - Bank 2
- DTC P0139: Ho2S2 Circuit Slow Response - Bank 1 Or DTC P0159: Ho2S2 Circuit Slow Response - Bank 2
- DTC P0171, DTC P0172, DTC P0174 Or DTC P0175
- DTC P0181: Fuel Tank Temperature Sensor Circuit Range/Performance
- DTC P0182: Fuel Tank Temperature Sensor Circuit Low Input Or P0183: Fuel Tank Temperature Sensor Circuit High Input
- DTC P0222: TP Sensor 1 Circuit Low Input Or DTC P0223: TP Sensor 1 Circuit High Input
- DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304 Or DTC P0306
- DTC P0327: Knock Sensor Circuit Low Input Or DTC P0328: Knock Sensor Circuit High Input
- DTC P0335: Crankshaft Position Sensor (Pos) Circuit
- DTC P0340: Camshaft Position Sensor Circuit - Bank 1 Or DTC P0345: Camshaft Position Sensor Circuit - Bank 2
- DTC P0420: Catalyst System Efficiency Below Threshold - Bank 1 Or DTC P0430: Catalyst System Efficiency Below Threshold - Bank 2
- DTC P0441: EVAP Control System Incorrect Purge Flow
- DTC P0442: EVAP Control System Small Leak Detected (Negative Pressure)
- DTC P0444: EVAP Canister Purge Volume Control Solenoid Valve Circuit Open Or DTC P0445: EVAP Canister Purge Volume Control Solenoid Valve Circuit Shorted
- DTC P0447: EVAP Canister Vent Control Valve Circuit Open
- DTC P0452: EVAP Control System Pressure Sensor Low Input
- DTC P0453: EVAP Control System Pressure Sensor High Input
- DTC P0455: EVAP Control System Very Large Leak
- DTC P0456: EVAP Control System Very Small Leak (Negative Pressure Check)
- DTC P0460: Fuel Level Sensor Circuit Noise
- DTC P0461: Fuel Level Sensor Circuit Range/Performance
- DTC P0462: Fuel Level Sensor Circuit Low Input Or DTC P0463: Fuel Level Sensor Circuit High Input
- DTC P0500: Vehicle Speed Sensor
- DTC P0506: Idle Speed Control System Rpm Lower Than Expected Or DTC P0507: Idle Speed Control System Rpm Higher Than Expected
- DTC P0550: Power Steering Pressure Sensor Circuit
- DTC P0605: Engine Control Module
- DTC P0650: Mil Control Circuit
- DTC P1065: ECM Power Supply Circuit (Back-Up)
- DTC P1102: Mass Airflow Sensor Circuit Range/Performance Problem
- DTC P1121: Electric Throttle Control Actuator
- DTC P1122: Electric Throttle Control Performance Problem
- DTC P1124: Throttle Control Motor Relay Circuit Shorted Or DTC P1126: Throttle Control Motor Relay Circuit Open
- DTC P1128: Throttle Control Motor Circuit Short
- DTC P1143: Ho2S1 Lean Shift Monitoring - Bank 1 Or DTC P1163: Ho2S1 Lean Shift Monitoring - Bank 2
- DTC P1144: Ho2S1 Rich Shift Monitoring - Bank 1 Or DTC P1164: Ho2S1 Rich Shift Monitoring - Bank 2
- DTC P1146: Ho2S2 Minimum Voltage Monitoring - Bank 1 Or DTC P1166: Ho2S2 Minimum Voltage Monitoring - Bank 2
- DTC P1147: Ho2S2 Maximum Voltage Monitoring - Bank 1 Or DTC P1167: Ho2S2 Maximum Voltage Monitoring - Bank 2
- DTC P1148: Closed Loop Control - Bank 1 Or DTC P1168: Closed Loop Control - Bank 2
- DTC P1211: VDC/TCS/Abs Control Unit
- DTC P1212: VDC/TCS/Abs Communication Line
- DTC P1217: Engine Over Temperature
- DTC P1225: Closed Throttle Position Learning Performance Problem
- DTC P1226: Closed Throttle Position Learning Performance Problem
- DTC P1229: Sensor Power Supply Circuit Short
- DTC P1444: EVAP Canister Purge Volume Control Solenoid Valve
- DTC P1446: EVAP Canister Vent Control Valve Closed
- DTC P1448: EVAP Canister Vent Control Valve Open
- DTC P1456: Evaporative Emission Control System Very Small Leak (Positive Pressure Check)
- DTC P1464: Fuel Level Sensor Circuit Ground Signal
- DTC P1490: Vacuum Cut Valve By-Pass Valve Circuit
- DTC P1491: Vacuum Cut Valve By-Pass Valve
- DTC P1564: ASCD Steering Switch
- DTC P1572: ASCD Brake Switch
- DTC P1574: ASCD Vehicle Speed Sensor
- DTC P1706: Park/Neutral Position Switch
- DTC P1800: VIAS Control Solenoid Valve Circuit Open
- DTC P1805: Brake Switch
- DTC P2122: Accelerator Pedal Position Sensor 1 Circuit Low Input Or DTC P2123: Accelerator Pedal Position Sensor 1 Circuit High Input
- DTC P2127: Accelerator Pedal Position Sensor 2 Circuit Low Input Or DTC P2128: Accelerator Pedal Position Sensor 2 Circuit High Input
- DTC P2135: Throttle Position (TP) Sensor Circuit Range/Performance Problem
- DTC P2138: Accelerator Pedal Position Sensor Circuit Range/Performance Problem
- DTC U1000: Can Communication Line (One-Trip Detection Logic) Or DTC U1001: Can Communication Line (Mil Will Not Illuminate)
Factory Service Tools
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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.
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