Keep in mind

• Note the test conditions, and use common sense when assessing the test results.
• The specified readings are with the ignition in position ON unless otherwise stated.
• First, check that the control module is supplied with current and is grounded.
• Then check all sensor inputs and signals from other systems.
• Finally, check the control module outputs. Remember that the test readings do not indicate whether the actuator is working.
• If any reading is not correct, consult the wiring diagram to trace the leads, connectors or components that should be checked more thoroughly.
  Fig 1: Control Module Voltage Specifications

  Courtesy of SAAB-SCANIA OF AMERICA, INC.
• The test readings given apply to a calibrated Fluke 88/97.
• The test readings show the signal's pulse ratio and pulse width. A test instrument with pulse ratio and pulse width measurement must be used. The (+) sign indicates a positive trigger pulse, TRIG+.
  Fig 2: Identifying Control Module Connector Terminals

  Courtesy of SAAB-SCANIA OF AMERICA, INC.

> = greater than; < = less than; ~ = alternating current (LP LOGIC PROBE P = select pulse; p = visible pulse)