Camshaft Position Sensor
- When measuring voltage at ECU, use Measuring Unit (981 3190
) and Adapter (981 3195
). See Fig 1
. DO NOT
measure voltage at ECU connector. Before disconnecting/connecting ECU connector, disconnect negative battery cable.
- To install measuring unit, remove distributor ignition ECU. Press adapter onto distributor ignition ECU and pull lead upward through slot beside module. Press distributor ignition ECU, with adapter connected, into connector in bottom of ECU box. Connect measuring unit to adapter 60-pin connector.
- Connect voltmeter between measuring unit terminals No. 20 and 4. Operate starter motor. Voltage should vary between 0-5 volts. If voltage reading is incorrect, check camshaft position sensor supply voltage. If voltage is present, check control signal to power stage.
- To check voltage supply to camshaft position sensor Hall Effect generator, connect voltmeter between measuring unit terminals No. 20 and 14. Voltmeter should indicate about 10 volts. If voltage is present but signal is absent, repeat test using new camshaft position sensor.
Courtesy of VOLVO CARS OF NORTH AMERICA.