B. Replace the PCM

1. Disconnect the negative battery cable at the battery.

NOTE:
To enhance customer satisfaction, remember to reset the clock when you have completed the service procedure.

CAUTION:
To avoid possible voltage spike damage to the PCM, the ignition key must be turned off, and the negative battery cable must be disconnected before unplugging the three PCM wiring connectors.

2. Carefully unplug the three 32-way wiring connectors from the PCM (Figure 2).

3. Remove the three PCM mounting bolts and remove the PCM from the vehicle.

4. Install the new PCM, as determined in Section "A", onto the truck.

5. Install and tighten the PCM mounting bolts to 35 in. lbs. (4 Nm).

6. Connect the three 32-way wiring connectors to the PCM.

7. Connect the negative battery cable.

8. Using the DRB III scan tool, program the new PCM with the vehicle's Vehicle Identification Number (VIN) and current vehicle mileage.

NOTE:
Failure to reprogram the new PCM with VIN information and mileage may cause a Diagnostic Trouble Code (DTC) to be set.

a. Connect the DRB III to the underdash diagnostic connector.

b. Select "DRB III STANDALONE" (1) and then press "Enter".

c. Select "1998 - 2001 DIAGNOSTICS" (1) and then press "Enter".

d. Select "ENGINE" (1) and press "Enter" three times.

e. Select "FUNCTION SCREEN" and scroll to page two (press the right arrow key once).

f. Select "MISCELLANEOUS".

g. Select "CHECK VIN" (4) and then press "Enter".

h. Follow the instructions on the DRB III screen to enter the VIN.

CAUTION:
Verify that the correct VIN is displayed on the DRB III before pressing the "Enter" key. The VIN cannot be changed once it is entered. If an incorrect VIN is entered, the module must be replaced to correct the VIN error.

i. Press the "PAGE BACK" button on the DRB III key pad.

j. Select "SRI MEMORY CHECK" (3) and then press "Enter".

k. Follow the instructions on the DRB III to enter the current vehicle mileage.

9. After entering the VIN and mileage, check for any additional software updates. Continue with Section C - Check for PCM Software Updates.