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Lafayette 3612 Engine BBR4400 - Caterpillar



BBR4400 Lafayette 3612 Engine Caterpillar parts G3612 Lafayette
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Alternative (cross code) number:
CABBR4400
BBR-4400
BBR4400
Caterpillar BBR4400 Lafayette 3612 Engine

Buy Lafayette 3612 Engine BBR4400 Caterpillar genuine, new aftermarket tractor parts with delivery
GAS ENGINE,

Compatible equipment models: BBR4400:

GAS ENGINE  G3612   Caterpillar
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Machine ECM
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the speed sensor circuits of the machine.
Table 1
Machine ECM (MID 39)
DTC Code Description System Response
191-2 Transmission Output Speed Sensor: Data Erratic, Intermittent, or Incorrect The FMI 2 will be activated when the ECM determines that the machine is traveling and the transmission speed sensor signal was greater than 200 rpm transmission speed but is now indicating 0 rpm for 2 seconds. The machine must be traveling in second gear, to activate the CID 191 FMI 2 diagnostic code.
191-11 Transmission Output Speed Sensor: Failure Mode Not Identifiable The FMI 11 will be activated if the ECM determines that the machine is traveling and the transmission speed sensor signal is low (0 to 200 rpm), for 10 seconds.
544-11 Engine Cooling Fan Speed Sensor: Failure Mode Not Identifiable Fan speed accuracy may be compromised. Possible causes for an FMI 2 diagnostic code are:
The signal circuit is shorted to ground.
The sensor is not installed correctly.
The sensor has failed.
The ECM has failed. This situation is unlikely.Possible causes for an FMI 11 diagnostic code are:
The signal circuit is shorted to ground.
The sensor is not installed correctly.
The sensor has failed.
The ECM has failed. This situation is unlikely.
Illustration 1 g03743778
Schematic of the Speed Sensors
Note: The diagram above is a simplified schematic of the connections for the speed sensors. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of the electrical schematic for the specific machine being serviced for the complete schematic.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.
Table 2
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With Sensor Circuit
Code present. FMI 2 diagnostic code, proceed to Test Step 2.
FMI 11 diagnostic code, proceed to Test Step 2.
Begin Process For FMI 2 & FMI 11 Troubleshooting HERE
2. Check The Resistance Of The Case Of The Sensor
A. Turn the key start switch and the disconnect switch (if equipped) to the OFF position.
B. Disconnect the machine harness connector from the sensor.
C. Measure the resistance from the signal contact and from the battery contact to the case of the sensor.
The resistance is greater than 10k ohms. OK - The resistance is greater than 10k ohms.
Proceed to Test Step 3.
NOT OK -The resistance is NOT greater than 10k ohms. The speed sensor has failed.
Repair: Replace the sensor.
Proceed to Test Step 7.
3. Check The Resistance Of The Sensor
A. The machine harness connector remains disconnected.
B. Measure the resistance between the signal contact and the battery

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