Replace the ECM and the AAC Valve

If both the ignition timing and base idle speed have been inspected with the service procedure in this bulletin and required no adjustment, do the following:

1. Replace the ECM and the AAC valve with the new parts listed under Repair B in the Parts Information table.

NOTE:
The ECM and AAC Valve MUST be installed as a set. The new ECM is labeled: "Installed per NTB98-088". It is accompanied with a label to be secured to the new AAC valve.

2. After installation of the ECM, locate the label found in the ECM box.

Figure 5:

3. Before installation of the AAC valve, secure the label found in the ECM box to the AAC valve as shown in Figure 5.

4. Install the new AAC valve.

5. Recheck the base idle as outlined in steps 1 through 11.

NOTE:
It is not necessary to recheck the ignition timing in step 6.

6. Use CONSULT to clear any DTCs. Road test the vehicle to ensure no other driveability problems are present.