Synchronous Reference Sensor
The Synchronous Reference Sensor (SRS) is an electronic component that is mounted on the back of the flywheel housing. See Figure "SRS Location" .
Figure 1. SRS Location
Note: The length of the SRS sensor element is 37.15-38.15 mm (1.463-1.502 in.).
The SRS sends a signal to the ECM. This signal is generated by a raised metal pin on the rear of the flywheel gear. The flywheel pin passes by the SRS as the number one piston reaches approximately 45 ° before top-dead-center. The ECM uses this information to determine engine speed.
Repair or Replacement of Synchronous Reference Sensor
The SRS is non-serviceable and should be replaced as a unit. No adjustment or repair 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. See Figure "SRS Location" .
- 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:
- The SRS is an electronic component. Use care upon installation. The O-ring on the senor may be coated with clean engine oil for ease of installation.
- Insert the SRS into the flywheel housing and index the hole in the bracket with the hole in the flywheel housing.
- Insert the SRS bolt and torque it to 20-26 N · m (15-19 lb · ft).
- Plug the connectors together, ensuring 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 Troubleshooting Guide, 6SE477 or 6SE489.
|Series 55 Service Manual - 6SE55|
|Generated on 10-13-2008|