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P1612 CHAIN OF ECM-IMMU SEC-37 < DTC/CIRCUIT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM] C D E F G H I J L M A B SEC N O P P1612 CHAIN OF ECM-IMMU Description INFOID:0000000009722726 BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. DTC Logic INFOID:0000000009722727 DTC DETECTION LOGIC NOTE: • If DTC P1612 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON under the following conditions. - Selector lever is in the P or N position. - Do not depress brake pedal. 2. Check “Self diagnostic result” with CONSULT. Is DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009722728 1. REPLACE BCM 1. Replace BCM. Refer to BCS-98, "Removal and Installation" . 2. Perform initialization of BCM and registration of Intelligent Key using CONSULT. Does the engine start? YES >> INSPECTION END NO >> GO TO 2. 2. REPLACE ECM Replace ECM. Refer to EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special >> INSPECTION END DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1612 CHAIN OF ECM-IMMU Inactive communication between ECM and BCM • Harness or connectors (The CAN communication line is open or • BCM |