DI/APC System Diagnostics

Test readings, control module connections

Values and instructions for measuring signals and signal levels on the DI/APC system are given in the following pages.

Remember:
- Readings should be taken via the BreakOut Box (BOB) connected between the control module and the control module connector.
- Several voltage levels must be regarded as standard values. Use your common sense when judging whether a reading is correct or not.
- If any reading is incorrect, use the wiring diagram to ascertain which conductor, connector or component requires further testing.
- All test readings are for an engine at normal operating temperature.
- Unless otherwise stated, the ignition should be switched on.
- The test readings in the table refer to a calibrated FLUKE 88/97.

Test readings, control module connections (M88)

Connector View:

Pin Values (1 of 2):

Pin Values (2 of 2):

Test readings, control module connections M89-M90

Connector View:

Pin Values (1 of 2):

Pin Values (2 of 2):

Test readings, control module connections M91-