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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Controls - Self-Diagnostics - 2.5L) >> Diagnostic Tests >> P1624: Immobilizer System Communication Counter = Zero >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for related service bulletins. Repair as necessary and go to next step.
  2. Turn ignition off and start engine. Using scan tool, retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1602 is present, go to DTC P1602: IMMOBILIZER UNIT - PCM COMMUNICATION ERROR  . If DTC P1621 is present, go to DTC P1621: CODE WORD DOES NOT MATCH AFTER ENGINE CRANKING  . If DTC P1602 and P1621 are not present, go to next step.
  3. Disconnect immobilizer unit connector. Check for loose, damaged or corroded connector terminals. Repair as necessary, and go to next step. If connector terminals are okay, go to next step.
  4. Reconnect all electrical connections. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off and start engine. Recheck DTCs. If DTC P1624 is present, replace PCM and go to next step. See REMOVAL, OVERHAUL & INSTALLATION article. On vehicles equipped with immobilizer system, reprogram ignition key identification numbers. See COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION. If DTC P1624 is not present, go to next step.
  5. Perform DTC confirmation procedure. See DTC CONFIRMATION PROCEDURE  under SELF-DIAGNOSTIC SYSTEM. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to appropriate test.
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