Service Procedure

Bulletin Applicability

Determine if this bulletin applies to the vehicle:





1. For 2000 Maxima vehicles, check the Emissions Certification Label on the underside of the engine hood (see Figure 1). Is the certificate for California emissions?

^ If the certificate is not for California emissions, this bulletin does not apply. Use the P0420 Diagnostic Procedures in the ESM to further diagnose and repair.

^ If the certificate is for California emissions, proceed to Check the Current ECM Part Number.

Check the Current ECM Part Number

With CONSULT-II "ON", print the Freeze Frame data as follows:

[START Nissan] >> [ENGINE] >> [Self-DIAG Results] >> [F.F. Data] >>[PRINT]

^ The Freeze Frame data that you've printed contains the ECM Part Number (P/N).





^ Figure 2 is an example of the F.F. Data printout.





^ Once you know the current ECM part number, go to the next step: "Compare the Current ECM Part Number to Chart A (shown).

Compare the Current ECM Part Number to Chart A:

Compare the vehicle's current ECM P/N to those shown under Current ECM P/N in Chart A:

A. If your vehicle's ECM P/N matches a P/N in the chart above:

^ Perform ECM Reprogramming.

B. If your vehicle's ECM P/N does not match a P/N in the chart above:

^ ECM Reprogramming is not necessary.

^ Replace the Front Tube Assembly and the Front H02S1-B1 Oxygen Sensor.
See Parts Replacement if needed for an illustration and more details.

ECM REPROGRAMMING

Vehicle ECM Reprogramming Overview

^ There are four basic steps:

1. Download reprogramming data (transfer it) from ASIST into CONSULT-II.

2. "Preparation" steps before reprogramming the vehicle ECM.

3. Reprogram the vehicle ECM.

4. "Wrap-up" after reprogramming is finished.

^ For those familiar with ECM Reprogramming, please review the following steps and use them as a Quick Reference for ECM reprogramming.

Step One: Download (Transfer) Data From ASIST Into CONSULT-II





1. Select vehicle model and model year (Example: Maxima, 2001).

2. Select the correct reprogramming data:

a. Locate the specific "Model Configuration" (Example: VQ30 4A/T ASCD TCS).

NOTE:
Model Configuration may include items such as engine type, transmission type, and vehicle options such as ASCD, ICS, ABS etc.

b Select (click on) the "To" number. (Write the "To" number on the repair order.)

NOTE:
The "To" number will read: 23710-XXXXX.

3. Click on the "Add" button.

^ This will add the selected data to the "File(s) Selected" list.

4. Click on "Continue" and follow directions to perform "data transfer" (download) from ASIST into CONSULT-II.

Step Two: Preparation for Reprogramming ECM

CAUTION:
DO NOT connect the CONSULT-II AC power supply for items 1 and 2.





1. Press [SUB MODE] (see Figure 4) then:

a. From the listed items, find and select [BATTERY CHARGE].





2. Check the CONSULT-II's "Charger Input" reading (see Figure 5).

NOTE:
^ "Battery Voltage" is the voltage level of CONSULT-II's battery.

^ Charger Input" is the voltage level of the vehicle's battery. (It must be above 12 volts.)

^ The general procedure includes a list of items to check when "Charger Input" voltage is below 12V.

Step Three: Reprogram the Vehicle ECM

Step Four: "Wrap-up" After Reprogramming is Finished

1. Turn the ignition switch "OFF" and turn CONSULT-II "OFF".

2. Wait more than 10 seconds, then;

a. Turn the ignition switch "ON" for 2 second, then





b. Turn the ignition switch "OFF" again for 10 seconds (see Figure 6). This will reset ECM "Self learned" Data.

3. Start the engine and check the idle speed.

^ If idle speed is too low, perform IAVL (Idle Air Volume Learning). See the appropriate Service Manual (ESM) for this procedure.

NOTE:
If the engine will not idle, hold the engine RPM at about 2000, then slowly bring it down to an idle. IAVL can now be performed.

4. Confirm the engine is operating normally.

5. Make sure the "Check Engine Light" (MIL) is not ON".

^ If necessary, use CONSULT-II and the Diagnostic (red/white) Card to erase any DTC's that may have stored during the reprogramming procedure.

Parts Replacement (if needed)





Replace the Front Tube Assembly and the Front HO2S1-B1 Oxygen Sensor (see Figures 7 and 8 ).

^ Refer to the FE section in the applicable ESM for the replacement procedures.