SPRING 4T3148 - Caterpillar

System Operation Description:Use this procedure under the following conditions:Use this procedure if any of the following conditions exist:
22-13 Engine Speed Signal Calibration Not Performed (42) is active or logged.
Either the primary engine speed/timing sensor or the secondary engine speed/timing sensor has been replaced.A timing calibration must be performed under the following conditions:
The ECM requires replacement and the ECM will not communicate with the Caterpillar Electronic Technician (Cat ET) in order to allow the timing calibration to be copied when the "Copy Configuration-ECM Replacement" feature is used.
Work has been performed on the engine drive train (front).The speed/timing sensors provide engine speed signals to the ECM. The signals are created as the timing gear on the camshaft rotates past the pickups of the speed/timing sensors. A unique pattern on the timing gear allows the ECM to determine the crankshaft position. This unique pattern on the gear allows the ECM to determine the top center position of the piston in the No. 1 cylinder. If the signal is lost from one of the sensors, a diagnostic code is generated. The ECM will use a special type of logic that will allow the engine to start on only one sensor.Timing calibration is accomplished by installing a special magnetic pickup into the side of the engine block. The magnetic pickup senses a special slot on the crankshaft counterweight.Note: The timing calibration will not increase the available engine power. Do not expect an increase in power due to the performance of the timing calibration.Replacement ECMIf a replacement ECM is required, the ECM parameters and the timing calibration can be transferred from the suspect ECM to the replacement ECM. Timing calibration will NOT be necessary. This feature requires Cat ET and this feature is only possible if the existing ECM can communicate with Cat ET.
Illustration 1 g00803980
Installation of the TC probe
Table 1
Required Special Tools    
Part Number    Description    
6V-2197     Magnetic Transducer    
7X-1695     Cable    
7X-1171     Transducer Adapter    
9S-9082     Engine Turning Tool    
170-3519     Harness (Timing Calibration)    Test Step 1. Install the 7X-1171 Transducer Adapter .
Turn the keyswitch to the OFF position.
Use the 9S-9082 Engine Turning Tool to put either the No. 1 piston or the No. 6 piston at top center. Refer to Systems Operation/Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston" for additional information.Note: Normal engine rotation is counterclockwise as the engine is viewed from the flywheel end. Refer to Illustration1.
Rotate the engine in the direction of the normal engine rotation by the following amount:
85 Degrees
Illustration 2 g00938732
Location of timing calibration port (typical example)
Remove the timing calibration plug from the engine. If the engine is viewed from the flywheel, the timing calibration plug is located on the left side in the No. 3 cylinder rod pocket.
Install the 7X-1171 Transducer Adapter into the port for the plug.Results:
OK - Proceed to Test Step 2.Test Step 2. Install the 6V-2197 Magnetic Transducer on the Engine
If the crankshaft is