Service Procedure/Information

SERVICE PROCEDURE/INFORMATION

Check the waveforms of the camshaft position sensors using the Pulse/Analog Box, SDI Box and SSMIII oscilloscope function. For detailed information and instructions, refer to the applicable Subaru Service Manual, Select Monitor III (SSMIII) - Users Guide and Subaru Diagnostic System (SDS) The "Help" function will allow you to access the tutorial information.

Back probing the ECM connector B137

1) Insert Pulse/analog probes in the Pulse/analog Box.





CH1, when connected to pin 24, will monitor the right hand camshaft position sensor.

CH2, when connected to pin 16, will monitor the left hand camshaft position sensor.








2) Carefully install straight pins to back probe pins 16 and 24.





3) Connect the leads to the straight pins which are back probed at the ECM connector. Make sure they do not touch each other or ground.








If an abnormal pulse is present, proceed with the following service procedure. If the pulse is normal, refer to the applicable service manual for additional troubleshooting and diagnostics.

Shim Selection and Installation

1) Record pre-set radio stations.

2) Disconnect negative battery cable.





3) Remove the 2 clips which secure the air intake duct, and then remove air duct.





4) Disconnect the wiring harness connector from the camshaft position sensor.





5) Remove the camshaft position sensor from the timing chain cover.

The following steps will determine what size shim will be required.





Note:
Make sure to record all measurements.

Measurements

A = Top of timing chain cover to camshaft position sensor plate

B = Camshaft position sensor mating surface to the bottom of the sensor