answersLogoWhite

0


Best Answer
Reset ECU (Clear Check Engine Light) in Nissan Altima

To clear all Check Engine light codes you need to reset the ECU (Engine Control Unit). The ECU is located on the driver's side on the right of gas pedal below the steering wheel. It is covered by a plastic piece. You will need to remove the plastic cover to get access to the ECU. You can pry open the the plastic cover. It does not have any screws. The ECU looks as in the picture below and has a Flathead screw.

Follow the steps below.

Do not start the engine ever during the entire procedure.

Procedure Start:

1. Turn ignition key to the "ON" position but do not start the engine. (The ignition key will remain in this position throughout the entire procedure)

2. Turn the ECU switch fully clockwise, wait two seconds.

3. Turn the ECU switch fully counter clockwise.

Now you are in the trouble diagnostic mode with the check engine light blinking. To determine the MIL (Malfunction Indicator Lamp) code number see below.

Continue on to resetting ECU:

4. Turn the ECU switch fully clockwise again, wait two seconds.

5. Turn the ECU switch fully counter clockwise again.

6. Turn ignition key to the "OFF" position.

Procedure End:

Note: Never start the engine in the entire procedure.

You can note down the ECU codes by reading the Long & Short flashes in the Check Engine Light. To determine the MIL (Malfunction Indicator Lamp) code number use the following rules to decode the flashes:

1. Long flashes (0.6 second) are the first digit.

2. Pause (0.9 second).

3. Short flashes (0.3 second) are the last digit.

4. Pause (2.1 seconds).

Next code (if present)

The long flashes will occur before the short ones. If there are multiple error codes, then there will be a noticeable pause (2.1 sec) before the next code starts. The ECM code repeats itself until you turn the ignition key to the OFF position, at which point the ECM resets itself to standard get-in-and-drive-mode. Additionally, if you get four blinks of ten (0000), the ECM is indicating no malfunction.

Use the following table to correlate the MIL code with ECU code

User Avatar

Wiki User

11y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How do you reset the ECU on an 02 Nissan Altima?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

How do you reset the compass in a nissam altima?

How do I go about restting the mirror-based compass in a 02 nissan Altima?


What is the correct tire size for a 2002 Nissan altima with 18 rims?

I have 245/45 18 on my 02 altima....


How many spark plugs in 02 Nissan altima se 3.5l v6 mpi engine?

6 coils in a nissan 2002 vic


How do you remove the speakers from a 2002 Nissan Altima?

Yahoo search 04 Nissan altima speaker and a you-tube link should pop up. 02 and 04 have the same set up so this should work for you vehicle


How do you replace thermostat on 02 altima?

To replace the thermostat on a 2002 Nissan Altima first drain out the coolant. Then proceed the to locate the thermostat housing which is by the engine compartment fuse box. Unbolt the housing and replace the thermostat.


Where is the second oxygen sensor located in a 2001 Nissan Altima gxe?

1 is on the intake manifold and the 02 sensor is right befor your cataylic converter


What does code P1610 and P1614 mean for an altima 02?

It means that your NATS (Nissan Anti Theft System) Is faulty, usually do to a bad key or u gotta use the original Nissan Key. Its a problem with your alarm.


How much does it cost to replace and oxygen sensor on an 02 Chevy Impala?

The sensor will cost around $75. It will cost another $75 to have it installed and the ECU reset.


How do you reset a 02 sensor heater circuit and transmission rnage sensor circuit?

year, ? engine displacement? ok, i will guess. pre 96: pull dome fuse , for 1 min. resets ecu. 96+ , pull neg. battery term for 5mins or use code reader to reset ecu. the transmission question makes no sense. sorry


How do you replace the knock sensor in a Nissan Altima?

what year if 98-02 it's on the transmission you can see it from the top of the car it's a little plastic black thing (:P), it has just one bolt on it and a connector


You took your silverado 01 6cyl to auto zone and they told you that the check engine was due to oxygen sensor. You changed it an it still does the same thing what could be wrong?

Your ECU has to be reset with a diagnostic computer. not just a code reader. The ECU does not know that the new 02 sensor has been installed. Mikey with Psi Motors


How do you cancel check engine light on 02 Chevy z 71 pickup?

The check engine light is on because the ECU has detected a problem with the emissions system. If you reset the light without repairing the problem it will just come back on. Have the ECU scanned with an OBD2 scan tool which will tell you the code that has been set. This code will lead you in the direction of the problem. Once you repair the problem you can reset the light with the same OBD2 scan tool.