Sensor Supply - Test
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906K, 906M, 907K, 907M, 908K and 908M Compact Wheel Loaders Electrohydraulic System
[UENR5036]
906K, 906M, 907K, 907M, 908K and 908M Compact Wheel Loaders Electrohydraulic System
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ELECTRICAL AND STARTING SYSTEM
SENSOR GP
906K, 906M, 907K, 907M, 908K and 908M Compact Wheel Loaders Electrohydraulic System
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Sensor Signal (PWM) - Test
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Speed Sensor - Test
906K, 906M, 907K, 907M, 908K and 908M Compact Wheel Loaders Electrohydraulic System
Sensor Supply - Test
906K, 906M, 907K, 907M, 908K and 908M Compact Wheel Loaders Electrohydraulic System
Calibration
1.1. Machine ECM
2.1. Diagnostic Trouble Code Procedure
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the sensor supply of the machine.
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| Machine ECM (MID 71) | ||
| DTC | Code Description | System Response |
| 41-3 | 8V DC Supply: Voltage above normal | Sensors supplied with 8V from this ECM will have data flagged as Invalid and diagnostics on those sensors will be disabled. |
| 41-4 | 8V DC Supply: Voltage below normal | Sensors supplied with 8V from this ECM will have data flagged as Invalid and diagnostics on those sensors will be disabled. |
| 262-3 | 5V Sensor DC Power Supply: Voltage above normal | Sensors powered by the 5 VDC supply will not function properly. |
| 262-4 | 5V Sensor DC Power Supply: Voltage below normal | Sensors powered by the 5 VDC supply will not function properly. |
Possible causes for an FMI 3 diagnostic code are:
- The sensor supply or the ground circuit in the machine harness is open.
- The signal circuit in the machine harness is shorted to another circuit
- The signal circuit in the machine harness is open or the sensor is disconnected.
- The sensor has failed.
- The ECM has failed. A failure of the ECM is unlikely.
Possible causes for an FMI 4 diagnostic code are:
- The signal circuit in the machine harness is shorted to ground.
- The sensor has failed.
- The ECM has failed. A failure of the ECM is unlikely.
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| Illustration 1 | g03812338 |
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Schematic of the Sensor Supply | |
Note: The diagram above is a simplified schematic of the Machine ECM and the Sensor Supply connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR5407 for prefixes: L66, L77, L88, or Electrical Schematic, UENR5408 for prefixes: Z66, Z77, Z88, or Electrical Schematic, UENR5409 for prefixes: H66, H77, H88.
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. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
| 1. Identify Active FMI Code Associated With Sensor Circuit | Code present. |
FMI 3 diagnostic code, proceed to Test Step 2. FMI 4 diagnostic code, proceed to Test Step 5. |
| Begin Process For FMI 3 Troubleshooting HERE | ||
| 2. Check The Supply Voltage At The Sensor A. Turn key start switch and disconnect switch ON. B. Do not disconnect the sensor from the machine harness. C. Refer to the schematic to determine the voltage source for the suspected faulty sensor. D. At the back of the contacts for the sensor, insert the multimeter probes along supply contact A and return contact B. Measure the voltage. |
The voltage measurement is approximately 8.0 VDC. |
OK - The voltage reading is correct for the suspected faulty sensor. Proceed to Test Step 3. NOT OK- The voltage is NOT correct for the circuit. Repair -Repair or replace the machine harness. Proceed to Test Step 8. |
| 3. Check For Proper Ground At The Sensor A. The machine harness remains connected to the sensor. B. Turn the key start switch and the disconnect switch OFF. C. Remove the multimeter probe from the voltage supply wire contact A. D. At the back of the harness connector for the sensor, insert a multimeter probe along the ground wire contact 2. E. Measure the resistance from contact B to frame ground. |
The resistance is less than 5 Ω. |
OK - The resistance is less than 5 Ω. The ground circuit is correct. Proceed to Test Step 4. NOT OK - The resistance is greater than 5 Ω. The ground circuit in the machine harness has failed. Repair: Replace or repair the machine harness. Proceed to Test Step 8. |
| 4. Check For A Short To Battery A. Turn key start switch and disconnect switch ON. B. Disconnect the machine harness from the ECM. C. At the machine harness connector for the ECM, measure the voltage from sensor supply contact to frame ground. |
The voltage is 0.0 ± 0.5 VDC. |
OK- The voltage is 0.0 ± 0.5 VDC. The voltage is correct. The ECM may have failed. Proceed to Test Step 8. NOT OK- Voltage is NOT 0.0 ± 0.5 VDC. The harness has failed. Repair: Repair or replace the machine harness. Proceed to Test Step 8. |
| Begin Process For FMI 4 Troubleshooting HERE | ||
| 5. Check The Sensor A. With FMI 4 active, disconnect the sensor from the machine harness. B. Observe Cat ET or the operator monitor for code change as the sensor is disconnected and connected to harness. |
Code changes from FMI 4 to FMI 3. |
OK - The diagnostic changed to FMI 3 when the sensor was disconnected. Repair: Replace the sensor. Proceed to Test Step 8. NOT OK - The FMI 4 diagnostic code remains active when sensor is disconnected. The sensor is not the cause of the problem. Proceed to Test Step 6. |
| 6. Check The Signal Circuit For A Short To Ground A. Turn the key start switch and the disconnect switch OFF. B. The sensor remains disconnected from the harness C. Disconnect the J1 harness connector from the ECM. D. Measure the resistance between the signal contact for sensor and frame ground. |
The resistance is greater than 5 kΩ. |
OK - The resistance is greater than 5 kΩ. The harness circuit is correct. Proceed to Test Step 7. NOT OK - The resistance is less than 5 Ω. A short circuit exists between frame ground and the signal circuit. Repair: Repair or replace the machine harness. Proceed to Test Step 8. |
| 7. Check The Supply Voltage at the Sensor A. Turn key start switch and disconnect switch ON. B. Disconnect the machine harness from sensor. C. Refer to the schematic to determine the voltage source for the suspected faulty sensor. D. Measure voltage between signal and ground contacts at the machine harness connector for the sensor. |
The voltage measurement is approximately 8.0 VDC. |
OK - The voltage reading is correct for the suspected faulty sensor. Proceed to Test Step 8. NOT OK- The voltage is NOT correct for the circuit. Repair - Repair or replace the machine harness. Proceed to Test Step 8. |
| 8. Check If The Diagnostic Code Remains A. Inspect the harness connectors and clean the contacts of the harness connectors. B. Reconnect all harness connectors. C. Turn key switch and disconnect switch ON. D. Operate the machine. E. Check if diagnostic code is active. |
Diagnostic code is no longer present. |
OK - Diagnostic code does not exist at this time. Initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP NOT OK - Diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing this component, always contact the Technical Communication at your dealership for possible consultation with AVSpare. This consultation may greatly effect repair time. Follow the steps in Troubleshooting, "Electronic Control Module (ECM) - Replace" if the ECM needs to be replaced. STOP |
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