Antitheft System - Engine No Start After PCM Reprogram

T01298

NO START AFTER REPROGRAMMING IMMOBILIZER SYSTEM

APPLICABLE MODELS
All 1998 626 vehicles equipped with immobilizer system.

DESCRIPTION

After replacing the transponder equipped key, immobilizer unit, and/or PCM, the immobilizer system requires reprogramming as outlined in the Workshop Manual. The reprogramming procedure in the Workshop Manual inputs a valid ID number and code word into the system components which then allows the vehicle to start.

If the vehicle does not start after reprogramming the system, do not replace any immobilizer system components. There is a possibility that the resistance in the immobilizer circuit has increased due to a poor contact or corrosion in the wiring/connector. This resistance causes the system operation voltage to drop during the crank mode of the reprogramming procedure, and the valid ID number/code word not to be inputted into the immobilizer components.

NOTE:
Do not unnecessarily replace immobilizer components. This is not a component failure. If this concern exists, use the following repair procedure.

REPAIR PROCEDURE

1. Verify concern.





2. Connect a jumper wire between the positive battery terminal and terminal J (power supply) or (L back-up power supply) of the immobilizer unit. Refer to the arrows in the illustration

NOTE:
Voltage must be 5.5 volts or more when reprogramming the ID.

3. Connect a jumper wire between terminal C of the immobilizer unit and ground.

4. Proceed to reprogramming the immobilizer system. See Workshop Manual 09-14 IMMOBILIZER SYSTEM REPROGRAM PROCEDURE.

^ IF the vehicle starts after reprogramming the system, locate and repair the area of high resistance using the wiring diagram above.

^ If the vehicle does not start, proceed to the diagnostics in the Workshop Manual.

5. Verify repair





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