Synchronous Reference Sensor
The Synchronous Reference Sensor (SRS) is an electronic component that is mounted to the rear of the gear case. See Figure "SRS Location " .
Figure 1. SRS Location
Note: The length of the SRS sensor element is 33.15-33.66 mm (1.305-1.325 in.).
The sensor portion of the SRS extends through a hole in the gear case, and is positioned very near the rear of the bull gear. A bolt, inserted through a hole in the SRS bracket, secures the SRS assembly to the gear case. The SRS connector is black in color.
The SRS sends a signal to the ECM. This signal is generated by a raised metal pin on the rear of the bull gear. See Figure "Bull Gear " .
Figure 2. Bull Gear
The bull gear pin passes by the SRS as the number one piston reaches approximately 45° before Top-Dead-Center. This information is used by the ECM to determine engine speed.
Repair or Replacement Synchronous Reference Sensor
The SRS is a non-serviceable item and is replaced as a unit. No adjustment is required.
Removal of Synchronous Reference Sensor
Remove the SRS as follows:
- Disengage the locking tang on the SRS connector. Grasp the connector bodies and gently pull them apart.
- Using a socket and long extension, remove the SRS bolt.
- Remove the SRS by pulling it straight out of the gear case.
Installation of Synchronous Reference Sensor
Install the SRS as follows:
Note: The SRS is an electronic component. Use care upon installation.
- The O-ring on the sensor may be coated with clean engine oil for ease of installation.
- Insert the SRS into the gear case and index the hole in the bracket with the hole in the gear case.
- Insert the SRS bolt and torque it to 30-38 N·m (22-28 lb·ft).
- Plug the connectors together, making sure the locking tang clicks into place.
- Turn the ignition to the "ON" position. If any diagnostic code other than 25 appears, refer to the DDEC II Troubleshooting Guide, 6SE489, or DDEC III/IV Single ECM Troubleshooting Guide, 6SE497.
|Series 50 Service Manual - 6SE50|
|Generated on 10-13-2008|