The Timing Reference Sensor (TRS) is an electronic component that is mounted on the right side of the flywheel housing, just below the starter. See Figure
TRS and Related Parts
The length of the TRS sensor element is 89.5 - 90.5 mm (3.524 - 3.563 in.).
The sensor portion of the TRS extends through the flywheel housing, and is positioned near the teeth of the timing wheel. A bolt, inserted through a hole in the TRS sensor, secures the TRS to the flywheel housing.
The TRS sends a signal to the ECM. This signal is generated by a series of evenly spaced teeth on the timing wheel. The signal is used by the ECM to determine engine timing.
Repair or Replacement of TRS
The TRS is a non-serviceable component and is replaced as a unit. No adjustment is required.
Removal of TRS
Remove the TRS as follows:
Disengage the locking tang on the TRS connector. Grasp the connector bodies and gently pull them apart.
Remove the bolt that secures the TRS to the flywheel housing.
Remove the TRS by pulling it straight out of the flywheel housing.
Installation of TRS
Install the TRS as follows:
The TRS 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 TRS into the flywheel housing and index the hole in the bracket with the hole in the gear case.
Insert the TRS 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. Observe or read any diagnostic codes. If any code other than 25 appears, refer to Troubleshooting Manual ,
or call Detroit Diesel Technical Service (313) 592-7282.