The Synchronous Reference Sensor (SRS) is an electronic component that is mounted to the rear of the gear case. See Figure 20155 .
Synchronous Reference Sensor 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 20412 .
The bull gear pin passes by the SRS as the number one piston reaches approximately 45 degrees before Top-Dead-Center (TDC). This information is used by the ECM to determine number one piston in the firing order.
The SRS is a non-serviceable item and is replaced as a unit. No adjustment is required.
Remove the SRS as follows:
Install the SRS as follows:
Note: The SRS is an electronic component. Use care upon installation.