Control Module: Testing and Inspection

Test readings, control module connections
Scope









The following pages contain values and directions for measuring transmission control module signals and levels.

Points to remember
^ Observe the test conditions, use your common sense when judging the readings obtained.
^ The specified readings are with the ignition in position ON unless stated otherwise.
^ First check that the control module is supplied with current and grounded.
^ Then check all sensor inputs and signals from other systems.
^ Finally, check the control module outputs. Remember that the readings do not indicate whether the actuator is in working order.
^ If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which ought to be checked more thoroughly.
^ The specified test readings refer to those obtained with a calibrated Fluke 88/97.
^ All readings are with warm engine/gearbox.

^ Test readings %(+) and ms(+) indicate the signal's pulse ratio and pulse duration. A test instrument capable of measuring pulse ratio and pulse width must be used. The sign denotes a positive trigger pulse, TRIG+.

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* ) The vehicle speed can be read using the diagnostic tool, menu "Read values" and "Output speed".