BUSHING 7K2019 - Caterpillar

Table 1
Diagnostic Trouble Codes
CDL Code and Description Comments
190-8
Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period The code is logged. The Electronic Control Module (ECM) can default to the secondary engine speed/timing sensor. The default will occur if a valid signal is not received from the primary engine speed/timing sensor. The engine will shutdown only if the signals from the primary engine speed/timing sensor and the secondary engine speed/timing sensor are abnormal.
342-8
Secondary Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period The code is logged. If a valid signal is not received from the secondary engine speed/timing sensor, the ECM will default to the primary engine speed/timing sensor. The engine will shutdown only if the signals from the primary engine speed/timing sensor and the secondary engine speed/timing sensor are abnormal.
Illustration 1 g01199875Probable Causes
Codes
Speed/Timing circuit
Battery voltage
Cranking speed
Sensor
Sensor supply voltage
ResistanceRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. While the engine is running, monitor Cat® Electronic Technician (ET) for codes. Also monitor the "Engine Starting" screen for an engine speed/timing that is "Not Detected".
B. Wait at least 30 seconds for activation of the diagnostic codes. Look for these codes on Cat ET:
190-8
342-8
Codes
Result: There is an active diagnostic code or there is a timing pattern that is "Not Detected".
Proceed to Test Step 5.
Result: There is not an active diagnostic code and there is not a timing pattern that is "Not Detected".
Repair: Download the "Warranty Report" from the engine ECM. Troubleshoot any diagnostic codes that may be present.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Engine Speed/Timing Circuit
A. Establish communication between Cat ET and the ECM .
B. Turn the keyswitch to ON.
C. Monitor the "Engine Starting" screen in Cat ET.
D. Start the engine and run the engine. The problem may occur when the engine is at any operating temperature. However, the problem is more likely to occur when the engine is at the normal operating temperature.
Speed/Timing circuit
Result: The engine started.
Proceed to Test Step 4.
Result: The engine did not start.
Proceed to Test Step 3.
3. Check the Battery Voltage
A. Monitor the "Engine Starting" screen in Cat ET.
B. Monitor the battery voltage. Crank the engine for 5 seconds.
C. Monitor the battery voltage while cranking.
Battery voltage
Result: The battery voltage is OK.
Proceed to Test Step 4.
Result: The battery voltage is NOT OK.
Repair: Refer to Troubleshooting, "Engine Cranks but Does Not Start".
If the problem is not resolved, proceed to Test Step 4.
4. Check the Engine Speed and the Engine Speed/Timing Status
A. Monitor the "Engine Starting" screen in Cat ET.
B. Crank the engine for 5 seconds. Verify that the sensors show an acceptable cranking speed.
C. While the engine is cranking, check the status of the engine speed/timing sensors.
Cranking speed
Result: A sensor is NOT OK. The timing pattern shows "Not Detected".
Proceed to Test Step 5.
Result: The sensors are OK. The timing pattern shows "Detected".
Repair: Refer to Troubleshooting, "Engine Cranks but Does Not Start".
If the problem is not resolved, proceed to Test Step 5.
5. Inspect the Sensor Assembly
A. Turn the keyswitch to OFF.
B. Visually