Automobile Repair/Nissan/Maxima (4th Generation)/With only a screw driver

Tools/Parts needed A flat headed screw driver A pencil and paper to record the numbers Procedure right|thumb|250px|Fig. #1: The cover is seen next to the gas pedal right|thumb|250px|Fig. #2:The ECU is the sliver box next to the gas pedal Turn the car on, but not the engine. To the right of gas pedal, there is a panel (see Fig. #1) attached to the center consul by two plastic screws, remove it. Now you should be able to see the ECU (see Fig. #2), a metal rectangular box, about one inch thick and four inches square. On the face of the side pointed at you there should be a screw covered by a transparent sticker with writing on it (unless the previous owner already removed it). Remove the sticker by pulling it off or just breaking through it with the screw driver. The sticker says "CAUTION DO NOT FORCE PAST STOP AFTER PERFORMING SELF DIAGNOSIS TURN SELECTOR FULLY COUNTERCLOCKWISE TO STOP". Turn the screw clockwise until it hits the stop (about one half turn), and wait 2 to 3 seconds and turn it back (counterclockwise wise) until it hits the back stop. DO NOT FORCE THE SCREW AFTER IT HITS THE STOP! Now look at you check engine light, it should be blinking. It will constantly repeat itself until the car is shut off. You have to read the blinks, the slow ones are the first digit of the number and the fast ones are the second digit. If you have multiple problems they will both be read one after the other. See Chart below for what each code means. Resetting the check engine light To reset the light just turn the screw back and forth twice. Then just shut the car off and start the engine up and you're ready to go. Check engine light codes and meanings Long blinks Short blinks Problem11Camshaft position sensor12Mass air flow sensor13Engine coolant temperature sensor14Speed sensor111EVAP control system (flow)114Fuel injection system right bank (too rich)115Fuel injection system right bank (too lean)21Ignition circuit23Closed throttle position switch25Idle speed control29Fuel Injection system left bank (too rich)210Fuel Injection system left bank (too lean)31ECU32Exhaust gas recirculation system flow problem33Front left O2 sensor34Knock sensor35Exhaust gas recirculation temperature sensor36EGRC-BPT valve37Closed loop control38Closed loop control41Air intake temperature sensor42Fuel tank temperature sensor43Throttle position sensor47Crankshaft position sensor55No Malfunction53Front right O2 sensor54Automatic transmission control unit63Cylinder #6 misfire64Cylinder #5 misfire65Cylinder #4 misfire66Cylinder #3 misfire67Cylinder #2 misfire68Cylinder #1 misfire71Multiple cylinder misfire72Three way catalytic converter (right side)73Three way catalytic converter (left side)74Evaporative emission control system pressure sensor75Evaporative emission control system77Rear O2 sensor81Vacuum cut valve bypass valve82Crank position sensor83Absolute pressure sensor84Automatic transmission control unit86Evaporative emission canister purge control solenoid valve87Evaporative emission Canister purge control solenoid valve circuit91Front Right O2 sensor93Evaporative emission Canister vent control valve95Crankshaft position sensor98Engine coolant temperature sensor101Front left O2 sensor 103Park and Neutral position switch105EGRC solenoid valve108Evaporative emission canister purge volume control valve111Inhibitor switch112Revolution sensor113Improper shifting to first gear (Automatic transmission)114Improper shifting to second gear (Automatic transmission)115Improper shifting to third gear (Automatic transmission)116Improper shifting to fourth gear (Automatic transmission)117Solenoid valve lock up function121Shift solenoid B (Automatic transmission)123Overrun clutch solenoid valve (Automatic transmission)124Torque converter clutch solenoid valve (Automatic transmission)125Line pressure solenoid valve (Automatic transmission)126Throttle position sensor (Automatic transmission)127Engine speed signal128Fluid temperature sensor132MAP/BARO Switch Solenoid Valve135Fuel pump control module138Cooling fan External links maxima.org - detailed information on to fix these problems