345-05135-1 Tohatsu BUSHING, RATCHET

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C-10 and C-12 EngineLeft side engine view
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3406E EngineLeft side engine view
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C-15, C-16 and C-18 EngineLeft side engine viewIf a replacement of the 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 the Caterpillar Electronic Technician (Cat ET) and this feature is only possible if the existing ECM can communicate with Cat ET. Use the "Copy Configuration - ECM Replacement" on Cat ET.When the sensors are being installed, complete all of the following tasks:
Lubricate the O-ring with oil.
Ensure that the sensor has a connector face seal inside the connector body. If a seal is damaged or missing, replace the seal.
Ensure that the sensor is fully seated into the engine before tightening the bracket bolt.
Ensure that the connector is latched on both sides.
Ensure that the harness is properly secured, and ensure that the tie-wraps are placed in the correct location.Intermittent Faults That Are Due To The Wiring Harness TerminalsA problem with the engine wiring harness has been identified. This problem may cause the ECM to detect several intermittent speed signal conditions on the following engines:
C-10 (3CS00001-05369)
C-12 (2KS00001-15070)
3406E (1MM00390-00838)
3406E (2WS08900-20705)If the intermittent condition occurs, the ECM will log the following diagnostic codes:
190-12 Primary Engine Speed loss of signal
64-12 Secondary Engine Speed loss of signalThe occurrence of these faults generally has no effect on engine performance, although the faults are occasionally accompanied by a speed burp of the engine.Measure the sensor resistance through the engine harness, when both of the following conditions are met:
The engine falls within the serial number ranges that are listed above.
The engine has logged several 190-12 and/or 64-12 fault codes.If the speed/timing sensors have the correct resistance, perform the following procedure in order:
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Socket that is stamped and formed
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Socket that is machined
Ensure that the software that is installed in the ECM is dated no earlier than March 1999. If the software is dated earlier than March 1999, flash the latest software into the ECM. Clear all of the fault codes that are related to the engine speed/timing sensors.
Remove one of the terminals of the harness socket from the connector for the engine speed/timing sensor P401 or P402. The sockets that are present at the sensor end of the wiring harness will be one of two types. The socket will be either a socket that is stamped and formed or a socket that is machined. The socket that is stamped and formed will have fingers that are crimped onto the wire insulation. Refer to Illustration 4. The socket that is machined can only be crimped onto the electrical conductor or wire. Refer to Illustration 5.
If the sockets that are stamped and formed are present in the sensor harness connectors, the sockets must be cut back at the sensor harness ends of the sensor harness for the engine speed/timing sensors, and each socket must be replaced by an 8T-8730 Connector Socket that is machined. The socket terminals in the connector assembly should be removed from the 2-pin connector. The 2-pin connector is a Deutsch DT-2 connector. The socket terminals should be changed, and reinserted. Perform this procedure on each wire one at a time in order to eliminate the chance of reversing the polarity of the connection. If machined terminals are already installed in the sensor harness connectors for the engine speed/timing sensors, resume troubleshooting at Test Step 3.
There is generally sufficient wire length in the engine harness in order to perform this repair. Cut back the socket terminals close to the ends of the sensor wires. Leave the wire as long as possible.
The wire tie-wraps for the speed-timing sensor harness can be loosened and the slack in the harness can be pushed toward the sensor, if necessary. Maintain at least 1 twist per inch in the speed-timing sensor harnesses from the ECM to the sensor.
Ensure that the wiring is not pulled too tightly at the sensor connector. If the wiring is pulled too tightly at the sensor connector, intermittent connections may develop as vibrations occur.
While this service is being performed on the C-10 and the C-12 engines, ensure that the wire tie-wrap for the primary engine speed/timing sensor on the engine front support is snug. This tie dampens excessive movement of the sensor wires during normal engine operation. If the wire tie-wrap for the harness is damaged