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On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE B3055 No transponder modulation or no transponder Ignition switch: ON The Immobilizer • Transponder • Harness or • Immobilizer control B3056 No transponder fixed code programmed Ignition switch: ON The Immobilizer • Transponder • Harness or • Immobilizer control DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn the ignition switch on, with the scan tool, view and erase stored DTCs in the Immobilizer control module. • Try to start the engine. • Turn ignition switch off, and wait a few seconds, then turn the ignition switch on. • With the scan tool, view active DTCs in the Immobilizer control module. • If the DTC is detected, the condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 15 Body & Accessories for more information). NOTE : Diagnostic Procedure 1. CHECK GROUND CONNECTION • Turn ignition switch off. • Loosen and retighten ground screws on the body (See Ground Inspection in Section 15 Body & Accessories). • Inspect ground connection C-204 mounting position (See Vehicle Wiring Harness Layout - Main Harness in Section 16 Wiring). Is the ground connection OK? Yes >> Go to the next step. No >> Repair or replace ground connection. 2. CHECK IMMOBILIZER CONTROL MODULE DTC • With the scan tool, view DTCs in the Immobilizer control module. Refer to DTC confirmation procedure. Is DTC B3055 present? Yes >> Go to the next step. No >> The condition that caused the DTC to set is currently not present (See Diagnosis & Testing Diagnostic Help in Section 15 Body & Accessories). DIAGNOSIS & TESTING 15
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