Connectors and Wiring Harness Requirements Figure 1: ECU Customer Connector (J1) 1 2 3 4 5 6 8 9 10 11 12 13 14 24 35 36 >PEI 23 31 40 48 47 57 ECU Side Harness Side 58 59 60 61 62 63 65 66 67 68 69 70 OEM Harness Connector J1/P1 5.1.4.3 ECU Harness Tie-Down Point The A4 ECU has a harness mounting bracket (Caterpillar part number 233-0891) mounted to the ECU. The wiring harness exiting the ECU connector (J1) must be secured to the ECU housing mounting bracket using a tie wrap clamp (Caterpillar part number 9X-6772). The wiring harness design is to adhere to design guidelines such that the ECU harness at the J1 connector meets the requirements defined in Wiring Harness Design (section 5.2).
The wire harness for ECU connector J1 must be secured to the engine within 600 mm from the ECU harness bracket, preferably 300 ± 50 mm. The referenced length is measured along the centerline of the harness bundle. The wire harness is not to be pulled tight between the ECU harness bracket and first engine tie-down point such that the mounting interferes with the ECU shock mounting. Harness Tie- Down Point I N D U S T R I A L E N G I N E E L E C T R O N I C S 28