BEARING AS-NEEDLE 1J3710 - Caterpillar

Use this procedure if the diagnostic code in Table 1 is active.
Table 1
Diagnostic Trouble Codes
CDL Code J1939 Code Code Description
(code descriptions may vary) Comments
261-11 637-11 Engine Timing Offset fault The wiring to the sensors might have the wrong polarity. The timing of the front gear train may be incorrect.
261-13 637-13 Engine Timing Calibration : Calibration Required A timing calibration is required for a new engine, replacing an Electronic Control Module (ECM) that fails to communicate or following work on the front gear train, the camshaft, or the crankshaft. If a 261-11 or 637-11 diagnostic code is active, verify that the wiring is installed correctly to the engine speed/timing sensors.The ECM can calibrate the mechanical differences between the Top Center (TC) of the flywheel and the TC of the timing gear on the camshaft. A transducer signals the TC of the flywheel to the ECM when a notch on a counterweight passes by the transducer. The engine speed/timing sensor signals the TC of the timing gear to the ECM. Any offset between the TC of the flywheel and the TC of the timing gear is stored into the memory of the ECM.Note: A timing calibration will not increase the available engine power.Table 2 lists the special tools that are required in order to perform this procedure.
Table 2
Required Special Tools
Part Number Description
7X-1171 Transducer Adapter
6V-2197 Transducer
7X-1695 Cable as
170-3519 Harness (1)
(1) This item is not required if the engine harness has a connector for timing calibration.
Illustration 1 g03048383
(A) Timing mark
(B) Idler gear