RENR5042-02 101 Troubleshooting Section Test Step 1. Inspect the Electrical Connectors and the Wiring A. Turn the keyswitch to the OFF position. g01102141 Illustration 26 P1 terminals that are associated with the CAN data link (P1-34) CAN data link (P1-42) CAN shield (P1-50) CAN data link + g01121169 Illustration 25 Engine components for the CAN data link (1) P63 connector for the electronic service tool (2) P61 customer connector (3) J1/P1 connectors B. Thoroughly inspect connectors (1), (2), and (3). Thoroughly inspect the connectors for each module that is connected to the CAN data link. Refer to Troubleshooting, “Electrical Connectors - Inspect”.