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SYMPTOM The MIL is on, and DTC P1149 (air/fuel ratio sensor range/performance problem) is set. PROBABLE CAUSE Under certain driving conditions, the ECM/PCM sets a false DTC P1149. CORRECTIVE ACTION Replace the ECM/PCM. PARTS INFORMATION DIAGNOSIS Connect the PGM Tester to the vehicle’s DLC (data link connector), and check for DTCs. • If DTC P1149 is stored, go to REPAIR PROCEDURE. • If another DTC is stored, go to the appropriate troubleshooting procedure in the service manual. REPAIR PROCEDURE Replace the ECM/PCM with the appropriate part listed under PARTS INFORMATION. For replacement information, see How to Remove the ECM/PCM for Testing on page 11-4 of the 1998–01 Accord Service

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CIRCUIT DESCRIPTION The vapor pressure sensor and VSV for vapor pressure sensor are used to detect abnormalities in the evap- orative emission control system. The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal. DTC P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in Fig. 1 below, or when there is a malfunction in either the VSV for EVAP, the VSV for vapor pressure sensor, or in the vapor pressure sensor itself. WIRING DIAGRAM Refer to DTC P0440 on page DI-84 . INSPECTION PROCEDURE HINT: S If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTC P0441, P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next. Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the VSV for EVAP, charcoal canister and vapor pressure sensor. S S TOYOTA hand-held tester:

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SYMPTOM The MIL is on, and DTC P2195 (rear air fuel ratio sensor signal stuck lean) or P2197 (front air fuel ratio sensor signal stuck lean) is set. PROBABLE CAUSE The ECM/PCM software incorrectly interprets sensor inputs, causing the codes to set. CORRECTIVE ACTION Using the HIM (Honda Interface Module), update the ECM/PCM with the iN monthly CD, dated August 2004 or later. REPAIR PROCEDURE NOTE: • Before you update an ECM/PCM, make sure the battery in the vehicle is fully charged. • To prevent ECM/PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof, etc.) during the update. 1. If not already done, load the May 2004 or later iN CD onto the iN master terminal. Loading instructions are included with the CD. 2. Update the ECM/PCM software with the HIM. For updating instructions, refer to Programming the HIM and Updating an ECM/PCM With a Programmed HIM in Service Bulletin 01-023, Updating Control Units/Modules. 3. Warm up the engine to operating temperature, then shut if off. 4. Do the ECM/PCM RESET and the CKP PATTERN CLEAR with the HDS.

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Vehicle Application: Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: 2004 Nissan Murano 3.5L, USA/Canada Malfunction Indicator Light (MIL) is ON. Bank 1 catalytic converter code P0420. 1. Check scan data for fuel trims to see if the system is in proper fuel control – look for 0% plus or minus 10% in generic or 90 – 110 % alpha in manufacture specific. 2. Verify there are no exhaust leaks. 3. Drive the vehicle and check the bank 1 rear O2 sensor activity on the scan tool or with a voltmeter to see if the bank 1 rear O2 sensor is cross counting like a typical front O2 sensor would. Catalytic Converter If in manufacture specific with the scan tool, Nissan displays fuel trims in alpha. 100% alpha is the same as 0% fuel trim. This vehicle has front air fuel ratio sensors – not O2 sensors. Bank 1 is the firewall bank. Bank 2 is the radiator bank. Before the catalytic converter lights off, the rear O2 sensor voltage is usually down around 0.2 – 0.4 volts or so but when the catalytic converter lights off, it uses up a lot of the oxygen so the rear O2 sensor voltage will typically reads around 0.6 – 0.7 volts and have some movement but not a lot of movement and should not cross count above and below 0.5 volts. The catalytic converter is covered under the 8 year 80,000 mile federal emissions warranty. 2004 Nissan Quest 3.5L, USA/Canada

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Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Trouble code P2626. 1. At the Air/Fuel Ratio (A/F) sensor, check to see if there is battery voltage to the sensor key on engine off on the White wire. Battery voltage should also be present on the Yellow/Orange wire key on. 2. Check to see if the Engine Control Module (ECM) grounds the Yellow/Orange wire on start up. 3. Check the resistance of the A/F sensor heater circuit. Normal resistance is 2.2- 2.9 ohms. 4. Check the remaining wires for shorts to ground or each other. 5.Follow Hyundia TSB # 03-36-014-01 for further testing. Air Fuel Ratio (AFR) Sensor Harness An A/F sensor would not be an uncommon problem.