Question about 1999 Mazda 626

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1999 Mazda 626 LX Engine error code 1602 Immobilizer unit ECM Communication error What does this mean?

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Hi!!
DESCRIPTION & OPERATION Immobilizer system consist of an ignition key (transponder equipped), coil (part of ignition lock cylinder), immobilizer unit, Powertrain Control Module (PCM), SECURITY light, and related wiring and fuses.
This system requires a key that has been programed into PCM and immobilizer unit to operate vehicle. When a key is used that has not been programed into PCM and immobilizer unit, the first 3 times the PCM will carry out fuel cut-off and ignition cut-off operations and engine will stop in a few seconds. The 4th time or after, engine cannot be started.
SECURITY light will illuminate for 1-2 seconds under normal operation. SECURITY light will flash when key ID does not match stored ID and SECURITY light will stay on when code word of immobilizer unit does not match stored code word.
Anti-theft Code 1602 refers to a miscommunication or no communication between the immobilizer system components, if vehicle starts, it means it is an intermittent problem. Most problems in electronic control system result from faulty wiring or poor electrical connections. To avoid unnecessary component testing, perform a visual inspection first.

Posted on Oct 12, 2010

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