GEAR-PLANETARY 3T6769 - Caterpillar

Use this procedure if the diagnostic code in Table 1 is active.
Table 1
Diagnostic Codes Table
Code Conditions which Generate this Code System Response
261-13 Engine Timing Calibration : Calibration Required The engine speed/timing sensor has not been calibrated. This will not keep the engine from running. The engine timing may be out of adjustment. The Electronic Control Module (ECM) has the ability to calibrate the mechanical differences between the Top Center (TC) of the flywheel and the TC of the timing gear on the left rear camshaft gear. A magnetic transducer signals the TC of the flywheel to the ECM when the TC hole on the flywheel passes beneath 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 memory.Calibration of the timing is required only after the following circumstances:
The ECM has been replaced.
The timing gear on the left camshaft and/or the rear gear train have been adjusted.
The timing gear on the left camshaft and/or the rear gear train have been replaced.Note: The 261-13 Engine Timing calibration required is generated only for a ECM that has never performed a timing calibration.The calibration procedure is initiated with the Caterpillar Electronic Technician (ET).
Installation of the Transducer
Illustration 1 g01772213
Location of the connectors for the timing calibration (ECM junction box)
(1) Connector for the timing calibration probe
(2) ECM junction box
(3) Service tool connector
Set the engine control to the OFF/RESET position. Install one end of 7X-1695 Cable As to P50 connector (1) that is located inside ECM junction box (2).
Connect Cat ET to service tool connector (3). Refer to Troubleshooting, "Electronic Service Tools".
Illustration 2 g01410072
Installation of the timing calibration probe (typical example)
(4) 6V-3093 Transducer Adapter
(5) 6V-2197 Transducer
(6) Timing calibration port in the flywheel housing
(7) Timing hole in the flywheel
The timing hole (7) in the flywheel must not be aligned with the transducer during installation. If the transducer is installed into the hole of the flywheel, the transducer will be damaged on engine start-up. Rotate the flywheel for more than 10 degrees before or aft