Data Link Connector: Description and Operation

PURPOSE AND OPERATION
The 14 CUX communicates with diagnostic test equipment (TestBook) through connector pins 18 and 9. These pins can be accessed through a harness located behind the glove box. Search for the harness carefully as it may be tucked in among other wiring.

Using this diagnostic connector allows you to perform system diagnostics without removing the harness connector from the ECM.





NOTE: Diagnosis of the 13 CU and 14 CU systems is not possible with TestBook. Use the Lucas handheld tester (HHT) for 1987-1989 vehicles.