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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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Definition Body Control System Malfunction Chassis Control System Malfunction HO2S 1 Heater Circuit MAF System Performance MAF Sensor Circuit – Low Frequency TP Sensor Circuit – High Voltage ECT Excessive Time To Enter Closed Loop Fuel Control ECT Below Thermostat Regulating Temperature HO2S 1 – Insufficient Activity For Closed Loop Operation HO2S Circuit Low Voltage – Sensor 1 HO2S Circuit High Voltage – Sensor 1 HO2S Circuit Slow Response – Sensor 1 Injector No. 5 Control Circuit Injector No. 6 Control Circuit High Transmission Fluid Temperature Fuel Pump Control Circuit Idle Speed – Low Idle Speed – High A/C Refrigerant Pressure Sensor Circuit System Voltage PCM Internal Program Fault PCM Not Programmed Generator Performance Malfunction Indicator Light Control Circuit Transmission Fluid Temperature Sensor Circuit Malfunction

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The Malfunction Indicator Light (MIL) may illuminate and DTC P0400 or P1195 may be stored in memory. This concern may be caused by any one of the following conditions: Mis-routed, twisted or kinked vacuum lines Swapped Pressure Regulator Control (PRC) and EGR Boost Sensor solenoid connectors. Defective EGR Boost Sensor PCM MIL misjudgment (1996 model with MTX) Customers complaining of this concern should have the vehicle inspected according to this bulletin and if necessary, repair. REPAIR PROCEDURE 1. Verify that all vacuum lines are properly routed, not kinked or twisted. 2. Locate the PRC and EGR boost sensor solenoid valves on the right side of the intake manifold. Refer to F1-3 (MTX) or F3-3 (ATX) of the 1996 workshop manual for solenoid location. Figure 1 3. Verify correct connector placement at the PRC and EGR Boost Sensor solenoid. If the connectors are not in the proper position, correct their placement and proceed to step 9. If the connectors are in the proper position, proceed to step 4. NOTE: The color of each connector varies with each powertrain. The PRC connector is the top connector and is BLACK or WHITE. The EGR boost sensor solenoid connector is the bottom connector and is ORANGE. 4. Inspect the EGR boost sensor. Warm engine to normal operating temperature. Measure the voltage between the signal wires (refer to table below) from the rear side of the connector.

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Malfunction Indicator Light (MIL) For most DTCs, the Check Engine Indicator (located in the lower portion of the tachometer) will illuminate when a fault is detected on the second drive cycle. See Fig. 1 . Only catalyst-damaging misfires, certain internal ECM failures and Controller Area Network (CAN) faults will illuminate the Check Engine Indicator when the fault is detected on the first drive cycle. In certain circumstances, the Message Center (located in the lower portion of the speedometer), will display fault warning information simultaneously with the Check Engine Indicator, or when a fault is detected on the first drive cycle. Also, in certain circumstances, the Amber or Red MIL (located above the Message Center) simultaneously with the Check Engine Indicator and Message center indicating the priority of the fault. Red MIL indicates a primary warning, loss of power and driveability. Do not drive vehicle. Amber MIL indicates a secondary warning, loss of power and driveability. Vehicle may still be driven.

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INTRODUCTION Some models may be equipped with one or more resettable maintenance reminder lights indicating service is required. Once services are performed, resetting of lights may be required. Information is provided to reset these lights where applicable. Most vehicles are equipped with a computer malfunction indicator light. If light comes on and remains on while driving, the vehicle requires service. After repairing fault(s) and clearing fault code(s), the malfunction indicator light should go out. Some models may use a dual-function indicator light, which is also used to indicate emission component service is due. After performing required service, reset indicator light. RESET PROCEDURES (CADILLAC) NOTE: 1980 CADILLAC 1. Every 15,000 miles, a reminder flag appears in speedometer face, indicating service of oxygen sensor is necessary. Inspect and service oxygen sensor as necessary, and reset flag. 2. To reset flag, remove lower steering column cover. Sensor reset cable is located to the left of the speedometer cluster. Pull cable lightly (maximum 2 lbs. force). Reinstall lower steering column cover. 1989-93 ALLANTE Engine Data Display 1. An OIL LIFE INDEX is one of the displays on Driver Information Center (DIC). It will display remaining oil life as a percentage estimate of the useful life of oil. 2. It will show 100 percent when the system is reset. When the oil life is 0 percent, the display will show CHANGE ENGINE OIL. After changing oil, reset oil life display. 3. To reset service reminder on 1989 models, press RANGE button until OIL LIFE INDEX appears on display. Depress and hold in AVG ECON and RANGE buttons for more than 5 seconds or until 100 is displayed. This will reset remaining oil life to 100 percent. 4. On 1990-93 models, press RANGE button until OIL LIFE INDEX appears on DIC display. Depress and hold in AVG SPEED and RANGE buttons for more than 5 seconds or until 100 is displayed. This will reset remaining oil life to 100 percent. 1989-91 ELDORADO & SEVILLE Most General Motors 1981-88 vehicles do not use a Service Reminder Indicator (SRI).