Service Procedure

If the vehicle is a 1986 model, begin with Part A of this service procedure. If the vehicle is a 1987 model, begin with Part C of this service procedure.
A. Inspection

1. Open hood and install fender covers.

FIGURE 1:

2. Locate and disengage connector from oil pressure switch. Refer to Figure 1.
3. Inspect top of oil pressure "switch" to determine if it is a three (3) terminal switch or a four (4) terminal sensor. (If vehicle is equipped with a four (4) terminal sensor, sensor replacement is not required.)

^ If three (3) terminals are present (oil pressure switch), proceed to step 4 below.

^ If four (4) terminals are present (oil pressure sensor), proceed to step 5 below.

4. Remove switch, examine the three male terminals on switch for corrosion and install new oil pressure sensor, part number 1644131.

5. Using a good light, closely examine the female terminal ends in the sensor connector for corrosion.

^ If there are any signs of corrosion on either the male terminal(s) of the removed oil pressure switch or the female connector terminal(s) it will be necessary to clean or replace the connector terminal(s). Proceed to Part B of this Service Procedure.

^ If there are no signs of corrosion, inspect the connector seal to ensure it is free of any dirt or debris and then reconnect connector to oil pressure sensor. If connector seal is contaminated with dirt or grease, or appears damaged, replace with new seal contained in connector kit, part number 1643680. Refer to Parts Information. Proceed to Part B, step 17 of this Service Procedure.

B. Oil Pressure Sensor Connector Terminal Cleaning/Replacement

1. Disengage secondary lock from back of connector and remove.

2. Grasp wire and push terminal forward in connector.

FIGURE 2:

3. Insert terminal removal tool into entry canal of connector and angle tool slightly to depress lock tang on terminal. Refer to Figure 2.

4. Gently pull on wire to remove terminal through back of connector.

5. If corrosion is white powder and only on contact surface of connector terminal (where mating to sensor terminal occurs), clean only with a standard contact cleaner, such as CRC Electra Clean, CRC Contact Cleaner or equivalent. Proceed to step 13.

6. If corrosion is a greenish powder on the contact surface and/or in the area of the crimp to wire, the affected terminal(s) must be replaced. Follow steps 7 thru 13 for each terminal affected.

FIGURE 3:

7. Cut off old terminal between insulation wings and core wings. Refer to Figure 3. Pull off old seal and remaining piece of terminal.

8. Strip 1/4 inch of insulation off wire and install new wire seal.

FIGURE 4:

9. Position wire into terminal, Figure 4.

10. With 18 gauge wire crimpers, crimp terminal core wings.

FIGURE 5:

11. Using rosin core solder, solder hand crimped terminal(s) as shown in Figure 5.

FIGURE 6:

12. Align wire seal with wire insulation (Figure 6) and use nose of wire crimpers to wrap the insulation wings around seal. (Wings around seal should just hold seal in place. DO NOT OVER CRIMP.)

FIGURE 7:

13. Ensure terminal lock tang is properly formed and plug terminal back into correct cavity of connector, Figure 7.
14. Install new secondary lock on back of connector.

15. Inspect the connector seal to ensure it is free of any damage, dirt or debris. If connector seal is contaminated with dirt or grease, or appears damaged, replace with new seal.

16. Reconnect the connector to the oil pressure sensor.

17. Position connector harness away from the serpentine belt and secure with electrical tape.

18. Install new EPROM. Refer to Part C.
C. EPROM Installation

1. Open I.P. compartment door.

2. Disconnect stop straps.

3. Remove screws attaching door to hinge.

4. Remove I.P. compartment door.

5. Remove relay center bracket assembly and position aside.

6. Remove fuse panel and position aside.

7. With ignition switch off, remove electrical connectors from BCM and loosen nuts attaching BCM to bracket.

8. Remove BCM.

FIGURE 8:

9. Remove four screws from access cover and remove cover. Refer to Figure 8.

10. Remove EPROM as follows: Using the rocker type PROM removal tool (Figure 8), engage one end of the EPROM carrier with the hook end of the tool. Press on the vertical bar end of the tool and rock the engaged end of the EPROM carrier up as far as possible. Engage the opposite end of the EPROM carrier in the same manner and rock this end up as far as possible. Repeat this process until the EPROM carrier and the EPROM are free of the EPROM socket.

11. Install new EPROM, mounted in carrier, in EPROM socket. Small notch in carrier must be aligned with small notch in socket. Press on EPROM carrier until it is firmly seated in the socket. Do not press on EPROM; only the carrier.

12. Install access cover and secure with four screws.

13. Reinstall BCM (reverse Steps 1 through 7).
14. Proceed to Part D of this service procedure.