Engine Speed - Test
Use this test to troubleshoot a problem with the engine speed sensor.
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| Illustration 1 | g03842530 |
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| Diagnostic Code | ||
|---|---|---|
| Code and Description | Default Conditions which Generate this Code | System Response |
| 190 -00 Engine Speed Sensor : High | The ECM detects an engine speed more than 2450 rpm. | The diagnostic code is logged. Also, the shutdown solenoid will de-energize until the engine speed is below 2420 rpm. |
| 190-08 Engine Speed Sensor : Abnormal Frequency, Pulse Width, or Period | The engine speed is changing at an abnormal rate. | The diagnostic code is active and logged. |
| 190-10 Engine Speed Sensor : Abnormal Rate of Change | The engine speed is greater than 3000 rpm. This is due to noise or other conditions. | The diagnostic code is active and logged. Also, the shutdown solenoid will de-energize until the engine speed is below 2420 rpm. |
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| Troubleshooting Test Steps | Value | Results |
|---|---|---|
1. Inspect Electrical Connectors and Wiring. A. Turn the engine control switch to the OFF position. B. Thoroughly inspect the J1/P1 connector, and the J10/P10 connector. Refer to Troubleshooting, "Electrical Connectors - Inspect". C. Perform a D. Check the allen head screw on each ECM connector for the proper torque. Refer to service Troubleshooting, "Electrical Connectors - Inspect". E. Check the harness for abrasions and for pinch points from the battery to the ECM. |
Electrical connectors and wiring |
Result : The electrical connectors and wiring are OK. Proceed to Test Step 2. Result : The electrical connectors and wiring are NOT OK. Repair : Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are coupled. If the problem is not resolved, proceed to Test Step 2. |
2. Check Engine Speed On Cat® Electronic Technician (ET) A. Connect Cat ET to the service tool connector. B. Turn the engine control switch to the ON position. C. Attempt to start the engine. D. Observe the engine speed on Cat ET. E. Turn the engine control switch to the OFF position. Note : Battery voltage may drop below the required level during cranking. If the engine will not start, power Cat ET by an outside source. |
Engine speed |
Result : The engine speed is OK. Repair : The engine speed sensor is functioning properly. For an intermittent problem, refer to Troubleshooting, "Electrical Connectors - Inspect". Result : The engine speed is NOT OK. Proceed to Test Step 3. |
3. Check The Sensor for a Short or for an Open. A. Turn the engine control switch to the OFF position. B. Disconnect connector J10/P10. C. Measure the resistance between J10-B and J10-C. |
140-230 Ohms |
Result : The sensor is OK. Proceed to Test Step 4. Result : The sensor is NOT OK. Repair : The sensor is faulty. Replace the sensor. If the problem is not resolved, proceed to Test Step 4. |
4. Check for Shorts in the Harness. A. Turn the engine control switch to the OFF position. B. Disconnect connector J10/P10, connector J1/P1, and connector J2/P2. C. Measure the resistance between P2-37 and P1-10. D. Measure the resistance between P2-37 and engine ground. E. Measure the resistance between P1-10 and engine ground. |
Greater than 20k Ohms | Result : The harness is OK. Proceed to Test Step 5. Result : The harness is NOT OK. Repair : There is a short in the harness. Repair the harness or replace the harness. If the problem is not resolved, proceed to Test Step 5. |
5. Check the Resistance through the Harness. A. Install Deutsch connectors on a B. Connect the wire between P10-C and P10-B. C. Measure the resistance between P1-37 and P2-10. Wiggle the harness during the measurement. This will reveal an intermittent problem. |
Less than 10 Ohms |
Result : The harness is OK. Proceed to Test Step 6. Result : The harness is NOT OK. Repair : The harness has an open. Repair the harness or replace the harness. If the problem is not resolved, proceed to Test Step 6. |
6. Check the Engine RPM Signal at the Sensor. A. Reconnect all connectors. B. Turn the engine control switch to the ON position. C. Measure the frequency between J10-C and J10-B. Use a 9U-7330 Digital Multimeter to measure the frequency. Take this measurement while the engine is cranking. |
Frequency between 150 Hz - 1000 Hz |
Result : The sensor is OK. Proceed to Test Step 7. Result : The sensor is NOT OK. Repair : The sensor is not producing the correct frequency. Replace the sensor. If the problem is not resolved, proceed to Test Step 7. |
7. Check the Engine RPM Signal at the ECM. A. Reconnect all connectors. B. Turn the engine control switch to the ON position. C. Measure the frequency between P1-37 and P2-10. Use a 9U-7330 Digital Multimeter to measure the frequency. This measurement should be taken while the engine is cranking. |
Frequency between 150 Hz - 1000 Hz |
Result : The harness is OK. Repair : Verify if the problem still exists. Check the rpm on an electronic service tool. If the problem is not resolved, replace the ECM. Refer to Troubleshooting, "ECM - Replace" for more information. Result : The harness is NOT OK. Repair : The harness is faulty. Repair the harness or replace the harness. |
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