Test readings, control module connections, main instrument unit
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Test readings, control module connections, main instrument unit
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The following pages contain readings and instructions for measuring signals and levels on the main instrument unit and its control module.
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Note the test conditions and use common sense when assessing the test result.
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First check that the control module has a power supply and is grounded.
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Then check all sensor inputs and signals from other systems.
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Finally, check the control module outputs. Remember that these readings are not an indication that the actuator is in working order.
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If a reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.
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The specified test readings are based on the use of a calibrated Fluke 88/97.
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Readings %(+) and ms(+) indicate the signal pulse ratio and pulse width respectively. A test instrument with pulse ratio and pulse width measurement must be used. The sign (+) indicates a positive trigger pulse, TRIG+.
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Control module connection
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Pin
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Component / Function
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In/Out
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Test conditions
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Across
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Test reading
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Comments
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1
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Check Engine lamp
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In
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Ignition ON
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1-4
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11.5-12 V
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2
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No connection
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3
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Battery voltage +30
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In
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Ignition ON
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3-4
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B+
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4
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Ground
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In
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Ignition ON
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4-B+
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B+
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5
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No connection
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6
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No connection
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7
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I-bus
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In/Out
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Ignition ON
Connect
86 11 857 Test lamp, red/green
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7-4
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The test lamp should flash
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All units connected to the I-bus transmit signals.
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8
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I-bus
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In/Out
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Ignition ON
Connect
86 11 857 Test lamp, red/green
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8-4
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The test lamp should flash
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All units connected to the I-bus transmit signals.
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9-12
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No connection
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