Measurement values, control unit connections PSG 16
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Measurement values, control unit connections PSG 16
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Directions for the measurement of levels and signals at the control module PSG 16 and the measurement values are given on the following pages.
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Pay attention to the measurement requirements, use common sense when judging the measurement result.
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The measurement values which are given are with the ignition ON unless otherwise stated.
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Check first that there is a voltage supply to the control module and that it is grounded.
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Then check all sensor inputs and signals from other systems.
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Lastly check the outputs of the control module. Remember that the output values do not say anything about the functioning of the related actuator.
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If any measurement value is incorrect, use the wiring diagram to determine which cables, connectors or components should also be checked.
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The given measurement values are as measured with a calibrated Fluke 88/97.
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The measurement values %(+) and ms(+) show respectively the pulse ratio and the pulse length. A test instrument with pulse ratio and pulse width measurement must be used. The plus sign (+) denotes a positive trigger pulse, TRIG+.
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>= greater than; <= less than
Pins without further comments lack a pin connection. (LP: LOGIC PROBE P= choose pulse; p= visible pulses)
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Note
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*All units connected to the I and P busses transmit signals.
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Connector K
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Pin ( refers to the control module)
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Colour
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Component / Function
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In / Out
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Measurement requirement.
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Measurement value
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Measure between
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4
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VT/WH
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Control module, glow plug
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Out
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Glow plug not activated
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10.3 V
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5-50
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5
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Radiator fan circuit 3
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Out
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Radiator fan circuit 3 activated
Radiator fan circuit 3 not activated
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<0.1 V
B+
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5-50
5-50
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7
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YE/BU
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Power supply measurement Group 3
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Out
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5 V
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7-50
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8
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BK
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Sensor ground
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In
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<0.1 V
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8-50
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9
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YE
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Reference ground, pedal position sensor 1
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In
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<0.1 V
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9-50
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10
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YE/BU
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Relay, +50
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In
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Rotation of the starter motor
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B+
<0.1 V
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10-28
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14
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VT/WH
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Check Engine warning light
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Out
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B+
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14-50
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16
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RD/GN
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Power supply, +15
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Out
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<0.1 V
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16-B+
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17
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P bus- *
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2-3V
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17-50
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19
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YE/GN
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Clutch switch, cruise control
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In
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Unaffected
Depressed
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B+
<0.1 V
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19-50
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21
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VT/WH
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Reference ground, pedal position sensor 2
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In
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<0.1 V
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21-50
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23
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GN/GY
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Relay, +50
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Out
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Rotation of the starter motor
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B+
<0.1 V
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10-28
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28
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YE/BU
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Main relay
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Out
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<1 V
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28-50
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29
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P bus+ *
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2-3V
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29-50
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30
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GN/GY
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A/C compressor
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Out
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Idling, A/C on
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B+
<0.5 V
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30-50
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31
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GN/BU
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Power supply measurement, Group 2
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Out
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5 V
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31-50
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32
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GY
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Pressure sensor, A/C
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In
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1-1.5 V
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32-50
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33
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BU/WH
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Pedal position sensor 1
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In
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Unaffected
Depressed
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<1 V
3.7-3.8 V
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33-9
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35
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GY
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Glow plug control module, signal
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In
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<0.5 V
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35-50
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36
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BK/YE
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Brake switch, cruise control
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In
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Unaffected
Depressed
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B+
<0.1 V
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36-50
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40
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BU/WH
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Brake lights
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In
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Unaffected
Depressed
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<1.5 V
B+
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40-50
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44
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OG/WH
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Atmospheric pressure sensor
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In
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4.2 V
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44-50
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45
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BU/WH
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Pedal position sensor 2
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In
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Unaffected
Depressed
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0.5 V
1.8 V
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45-21
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49
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YE/GY
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Main relay
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In
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B+
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49-50
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50
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BK
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Power ground
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Out
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B+
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50-49
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51
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YE/GY
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Main relay
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B+
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51-50
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52
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BK
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Power ground
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B+
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52-49
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53
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YE/GY
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Main relay
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B+
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53-50
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54
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BK
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Power ground
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B+
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54-49
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55
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YE/GY
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Main relay
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B+
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55-49
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56
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BK
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Power ground
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B+
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56-49
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Connector M
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Pin ( refers to the control module)
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Colour
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Component / Function
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In / Out
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Measurement requirement.
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Measurement value
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Measure between
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1
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GN/WH
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Mass air flow sensor
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Out
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5 V
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1-47
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6
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GN/WH
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Level switch, engine oil
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Out
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<0.1 V
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6-B-
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8
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GY
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Temperature sensor, coolant
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Out
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2.9 V
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8-45
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9
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BU
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Absolute pressure sensor
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In
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1.75 V
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9-B-
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10
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BK/GN
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Mass air flow sensor
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In
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1.1 V
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10-B-
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11
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GY
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Screen ground
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In
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<0.1 V
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11-B-
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13
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PK
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Solenoid valve, charge air
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Out
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5.5 V
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13-B-
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14
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WH
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EGR
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Out
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10.3 V
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14-B-
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19
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OG/WH
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EGR
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In
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4.4 V
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19-B-
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21
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BK
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Temperature sensor, engine oil
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Out
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4.1 V
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21-33
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22
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GN/WH
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Intake air temperature
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In
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2.2 V
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22-46
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23
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BK
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Crankshaft sensor
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In
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Idling
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1.6 V alternating current
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23-35
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24
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GN/WH
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Pressure switch, engine oil
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Out
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Idling
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<0.1 V B+
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24-B-
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27
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L-Terminal
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Idling
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B+ <0.5 V
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27-B+
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28
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YE/BU
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Main relay
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Out
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B+
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28-B+
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29
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PK
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Solenoid valve, engine shut-off
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Out
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B+
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29-B-
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33
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BK
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Temperature sensor, engine oil
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In
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4.1 V
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33-21
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34
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BK
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Level sensor, fuel
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In
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B+
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34-B+
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35
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YE
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Crankshaft sensor
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In
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Idling
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1.6 V alternating current
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35-23
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39
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BU/WH
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Power supply, Map
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Out
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5 V
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39-B-
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42
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PK
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Solenoid valve, engine shut-off
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Out
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B+
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42-B-
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43
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BN/WH
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Solenoid valve, combustion circulation
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Out
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5.3 V
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43-B-
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45
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BK
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Temperature sensor, coolant
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In
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2.9 V
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45-8
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46
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BK
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Map, sensor ground
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In
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5 V
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46-39
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47
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BU
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Mass air flow sensor, reference ground
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In
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5 V
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47-1
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48
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GY
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Level sensor, fuel
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Out
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1 V
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48-34
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