Service Procedure

1. Make sure the engine does not have any intake or exhaust leaks.

^ Use the EC section of the appropriate Service Manual (ESM) and ASIST for intake and exhaust system diagnostic information.

^ If no intake or exhaust system leaks are found, go to step 2.

2. Replace the A/F Sensor (bank 1 or bank 2).

^ The A/F Sensor is located in the exhaust manifold in front (upstream) of the catalyst.

For DTC code(s) P0171 and/or P1273:

^ Replace A/F Sensor-Bank 1





^ It is located on the side of the engine that is towards the rear of the vehicle (see Figure 1)

For DTC code(s) P0174 and/or P1283:

^ Replace A/F Sensor-Bank 2





^ It is located on the side of the engine that is towards the front of the vehicle (see Figure 2)





3. Reprogram the ECM (needed only if a match is found in chart A shown).

^ Check the Current ECM Part Number.

^ Compare your Current ECM Part Number to Chart A.

Check the Current ECM Part Number





With CONSULT-II "ON", print the Freeze Frame data as shown.

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





Figure 3 is an example of the F.F. Data printout.

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.

^ This bulletin does not apply. Refer to the appropriate TSB or ESM for further diagnosis and repair.

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.

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, 2004).

2. Select the correct reprogramming data:

a. Locate the specific "Model Configuration" (Example: VQ35 4A/T ASCD TCS).

NOTE:
Model Configuration may include items such as engine type, transmission type, and vehicle options such as ASCD, TCS, 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

1. Connect a battery charger to the vehicle's battery. Set the charger to a low charger rate (trickle charge).

CAUTION:
DO NOT connect the CONSULT-II AC power supply for items 2 and 3.





2. Press [SUB MODE] (see Figure B) then:

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





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

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.)

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 1 second, then





b. Turn the ignition switch "OFF" again for 10 seconds (see Figure D). 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.