The following is the correct procedure for resetting the ECU

See the red text in Step 3 which is crucial to success.

350Z ECU Resetting Procedures

Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON.

A stop watch or an analog clock with a second?s needle will be useful.

Operational Procedure

1. Confirm that accelerator pedal is fully released, turn ignition switch ?ON? and wait 3 seconds.

2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.

3. Wait 7 seconds**, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.*
*at this point you need to count the CEL light flashes, think it starts by flashes 10 times slowly to indicate it is beginning then faster for the code. For example if it flashes 10 times slowly, 3 times fast, 2 times fast, 5 times fast 10 times slow then the code would be 325, then just match to the code list.
**The 7 seconds starts from the end of the 5 seconds period above it does NOT start from the 5th release of the accelerator pedal.

4. Fully release the accelerator pedal (while the CEL is still blinking)

5. Wait about 10 second.

6. Fully depress the accelerator pedal and keep it for more than 10 seconds.

7. Fully release the accelerator pedal (The CEL light will continue to blink but at a a faster rate).

8. Turn ignition switch to ?OFF? position and now you can start the car. The CEL light should be gone.

If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.


[Information originally compiled from the Technosquareinc website www.technosquareinc.com]