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  • P1694 No Bus Message Received From Companion Module

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    DTC P1694: NO BUS MESSAGES RECEIVED FROM COMPANION MODULE

    1. Turn ignition on with engine off. Using scan tool, select BODY and select type of instrument cluster that vehicle is equipped with. Once type of instrument cluster is selected, the bus operational test will be performed automatically. If scan tool displays BUS OPERATIONAL, go to next step. If scan tool does not display BUS OPERATIONAL, refer to symptoms displayed on scan tool to identify the bus failure and then diagnose and correct bus failure, see COMMUNICATIONS under SYSTEM TESTS in BODY CONTROL MODULES - RAM PICKUP article in ACCESSORIES & EQUIPMENT.

    2. Ensure ignition is on with engine off. Using scan tool, clear DTCs from PCM. Turn ignition off and then back on again with engine off. Using scan tool, check for stored DTCs in PCM. If DTC P1694: NO BUS MESSAGES RECEIVED FROM COMPANION MODULE exists, go to next step. If DTC P1694: NO BUS MESSAGES RECEIVED FROM COMPANION MODULE does not exist, test is complete.

    3. Turn ignition off. Disconnect ECM connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Connect jumper wire between ground and terminal No. 41 (Violet/Brown wire) on ECM connector. Turn ignition on with engine off. Using scan tool, go to BODY and select type of instrument cluster that vehicle is equipped with. Once type of instrument cluster is selected, the bus operational test will be performed automatically. If scan tool displays SHORT TO GROUND, remove jumper wire and go to next step. If scan tool does not display SHORT TO GROUND,remove jumper wire. Repair open on Violet/Brown wire between ECM and data link connector. Perform TEST VER-2A .

    4. Turn ignition off. Ensure ECM connector is still disconnected. Connect jumper wire between ground and terminal No. 40 (White/Black wire) on ECM connector. Turn ignition on with engine off. Using scan tool, select BODY and select type of instrument cluster that vehicle is equipped with. Once type of instrument cluster is selected, the bus operational test will be performed automatically. If scan tool displays SHORT TO GROUND, remove jumper wire and go to next step. If scan tool does not display SHORT TO GROUND, remove jumper wire. Repair open on White/Black wire between ECM and data link connector. Perform TEST VER-2A .

    5. Turn ignition off. Ensure ECM connector is still disconnected. Using ohmmeter, check resistance between ground and terminal No. 30 (Black/Tan wire) on ECM connector. If resistance is less than 10 ohms, replace ECM. Perform TEST VER-2A . If resistance is 10 ohms or more, repair open on Black/Tan wire between ECM and ground connection. Ground connection is located at ground connection for negative battery terminal. Perform TEST VER-2A .

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