Programmable Read Only Memory (PROM) Replace

NOTE:
- To prevent possible Electrostatic Discharge damage to the PROM, Electronically Erasable Programmable Read Only Memory (EEPROM), DO NOT touch the component leads, and DO NOT remove integrated circuit from carrier.
- DTC 51 indicates a faulty PROM, bent pins, or incorrect installation.
- The ignition should always be "OFF" when installing or removing the ECM connectors.

CAUTION: It is possible to accidentally install a PROM backwards. If the PROM is installed backwards and the ignition key turned to "ON," the PROM circuitry will be destroyed, requiring PROM replacement.

REMOVAL
1. Refer to "ECM removal" earlier in this Section.
2. PROM access cover.
3. Remove PROM assembly.








IMPORTANT:
- Using the rocker-type Programmable Read Only Memory (PROM) removal tool, engage one end of the PROM carrier with the hook end of the tool. Press on the vertical bar end of the tool and rock the engine end of the PROM carrier up as far as possible. Engage the opposite end of the PROM carrier in the same manner and rock this end up as far as possible. Repeat this process until the PROM carrier and PROM are free of the PROM socket. The PROM carrier with PROM in it should lift off of the PROM socket easily. PROM carrier should only be removed by using the pictured PROM removal tool. Other methods could cause damage to the PROM or PROM socket.

REMOVAL
- New PROM carrier in PROM socket.

INSPECTION AND REPAIR
1. New PROM for correct part number.

IMPORTANT:
- Do Not remove PROM from carrier to check PROM number.

2. For correct placement of PROM in carrier.
- Small notch of carrier should be aligned with small notch in socket. Press on PROM carrier until it is firmly seated in the-socket. Do not press on PROM: only the carrier.
3. Access cover on Engine Control Module (ECM).
4. Refer to ECM installation.