3500B Engines for 5130B and 5230B Excavators Digital Sensor Supply Caterpillar


Digital Sensor Supply
`
3500B Engines for 5130B and 5230B Excavators [RENR1305]
ELECTRICAL AND STARTING SYSTEM
SENSOR GP

System Operation Description:

The Digital Sensor Supply provides power to all digital sensors. The Electronic Control Module (ECM) supplies 8.0 ± 0.4 VDC from the ECM connector J1/P1 to each digital sensor connector pin "A". The digital sensor return is used as the return line for the digital sensors, speed/timing sensors, and the switch inputs to the ECM. The digital return line is from the ECM connector J1/P1 to each digital sensor connector pin "B". The digital sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM. The digital sensors are NOT protected from overvoltage.

The following list contains a description of the Digital Sensors that are found on the engine.

Left Exhaust Temperature Sensor - The ECM uses the signal from the sensor to monitor left exhaust temperature. The sensor is mounted in the left exhaust manifold before the turbocharger. The sensor output is a constant frequency signal with a pulse width that varies with the exhaust temperature. The output signal is referred to as a Duty Cycle or as a Pulse Width Modulated signal. The output signal is expressed as a percentage between 0 and 100 percent. The Electronic Technician (ET) will display the exhaust temperature as a value between 49 °C to 850 °C (120 °F to 1562 °F). If the actual temperature is between -40 °C to 49 °C (-40 °F to 120 °F) the display will read 30 °C (86 °F). If the temperature is above 851 °C (1564 °F) the display will read 851 °C (1564 °F).

Right Exhaust Temperature Sensor - The ECM uses the signal from the sensor to monitor right exhaust temperature. The sensor is mounted in the right exhaust manifold before the turbocharger. The sensor output is a constant frequency signal with a pulse width that varies with the exhaust temperature. The output signal is referred to as a Duty Cycle or as a Pulse Width Modulated signal. The output signal is expressed as a percentage between 0 and 100 percent. The Electronic Technician (ET) will display the exhaust temperature as a value between 49 °C to 850 °C (120 °F to 1562 °F). If the actual temperature is between -40 °C to 49 °C (-40 °F to 120 °F) the display will read 30 °C (86 °F). If the temperature is above 851 °C (1564 °F) the display will read 851 °C (1564 °F).

Power Shift Pressure Sensor - This sensor measures the power shift pressure which is used in the calibration of the power shift solenoid. The output of the sensor is a pulse width modulated signal(PWM). The output range of the sensor is 0.0 kPa to 116 kPa (0.0 psi to 16.8 psi).

Note: The Engine Monitoring System can be programmed by dealers and/or customers. Dealers and/or customers can monitor customized warnings, derates, shutdown override setpoints, and delay times using the Electronic Technician (ET). Customized parameters may affect the behavior of the ECM. The behavior of the ECM may vary from the description that is given in this System Operation section. You may refer to Troubleshooting, "Engine Monitoring System" in order to determine if there are any parameters that are affecting engine operation.




Illustration 1g00813133

Typical schematic

Test Step 1. Check for Connector Damage.

  1. Turn the keyswitch to the OFF position.

  1. Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.

  1. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.

  1. Check the ECM connector (allen head screw) for the proper torque of 6.0 N·m (55 lb in).

  1. Check the customer connector (allen head screw) for the proper torque of 2.25 ± 0.25 N·m (20 ± 2 lb in).

  1. Check the harness and the wiring for abrasion and pinch points.

Expected Result:

All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, abrasion or pinch points.

Results:

  • OK - The connectors and wiring are okay. Proceed to test step 2.

  • Not OK - The connectors and/or wiring are not okay.

    Repair: Repair the connectors or wiring and/or replace the connectors or wiring.

    Stop.

Test Step 2. Check for a Short Circuit in the Wiring Harness.

  1. Disconnect ECM connector J1/P1 and all of the digital sensors.

  1. Measure the resistance between the digital supply P1-35 (700-OR) and the digital return P1-29 (998-BR) on connector P1.

  1. Measure the resistance between the digital supply P1-35 (700-OR) and engine ground.

  1. Measure the resistance between the digital return P1-29 (998-BR) and engine ground.

Expected Result:

The resistance should be greater than 20,000 Ohms for each measurement.

Results:

  • OK - The resistance is greater than 20,000 Ohms. Proceed to test step 3.

  • Not OK - The resistance is less than 20,000 Ohms.

    Repair: Repair the connectors or wiring and/or replace the connectors or wiring.

    Stop.

Test Step 3. Check the Digital Supply Voltage at the ECM.

  1. Install a Breakout T at ECM connector J1/P1.

  1. Remove the wire P1-35 from the harness side of the Breakout T.

  1. Remove the wire P1-29 from the harness side of the Breakout T.

    Note: If you remove the sensor common from the ECM an open circuit diagnostic code will be generated for all sensors that use the sensor common. Troubleshoot the original code. Delete the logged diagnostic codes when you are finished.

  1. Turn the keyswitch to the ON position. The engine should be off.

  1. Measure the voltage between the digital sensor supply P1-35 and the digital sensor return P1-29 at the Breakout T.

  1. Turn the keyswitch to the OFF position.

  1. Remove the Breakout T and reconnect ECM connector J1/P1.

Expected Result:

The supply voltage should be 8.0 ± 0.4 VDC.

Results:

  • OK - The supply voltage is 8.0 ± 0.4 VDC. The digital sensor supply is producing the correct voltage. Proceed to test step 4.

  • Not OK - The supply voltage is not 8.0 ± 0.4 VDC. The digital sensor is not producing the correct voltage.

    Repair: Perform the following diagnostic procedure Troubleshooting, "Electrical Power Supply".

    Stop.

Test Step 4. Check the Digital Sensor Supply Voltage at the Sensor Connector.

  1. Turn the keyswitch to the ON position. The engine should be off.

  1. Measure the digital sensor supply voltage between the digital supply terminal-A (700-OR) and the digital return terminal-B (998-BR) of all the digital sensors.

    Note: If the sensor is disconnected from the harness, an open circuit diagnostic code will be generated for that sensor. Troubleshoot the original code. Delete the logged diagnostic codes when you are finished.

  1. Turn the keyswitch to the OFF position.

Expected Result:

The supply voltage should be 8.0 ± 0.4 VDC.

Results:

  • OK - The supply voltage is 8.0 ± 0.4 VDC at all of the digital sensor connectors. Proceed to test step 5.

  • Not OK - The supply voltage is not 8.0 ± 0.4 VDC. There is an open circuit in the harness or connectors.

    Repair: Repair the connectors or wiring and/or replace the connectors or wiring.

    Stop.

Test Step 5. Check the Digital Sensors for Short Circuits.

  1. Install a Breakout T at ECM connector J1/P1.

  1. Turn the keyswitch to the ON position. The engine should be off.

    Note: If the sensor is disconnected from the harness, an open circuit diagnostic code will be generated for that sensor. Troubleshoot the original code. Delete the logged diagnostic codes when you are finished.

  1. Connect one digital sensor at a time.

  1. Measure the voltage between the digital sensor supply P1-35 and the digital sensor return P1-29 at the Breakout T. Repeat these steps with all of the digital sensors.

  1. Turn the keyswitch to the OFF position.

  1. Remove the Breakout T and reconnect ECM connector J1/P1.

Expected Result:

The supply voltage should be 8.0 ± 0.4 VDC.

Results:

  • OK - The supply voltage is 8.0 ± 0.4 VDC. The digital sensor supply is correct. The harness and sensors are okay.

    Repair: The problem may be intermittent. Check the wiring and connectors for problems. Perform the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".

    Stop.

  • Not OK - The supply voltage is not 8.0 ± 0.4 VDC. The sensor may be internally shorted.

    Repair: Temporarily install a new sensor. Ensure that the problem is no longer present. Reinstall the old sensor. If the problem returns, replace the sensor.

    Stop.

Information System:

HDB Series and M1 Series Heavy Duty Brushless Alternators Component Description
3500B Engines for 5130B and 5230B Excavators CAT Data Link
M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Clock Adjustment
312C Excavator 3064 Engine Supplement Fuel Filter (Primary) and Fuel Filter Base - Remove and Install
M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Main Menu
3500B Engines for 5130B and 5230B Excavators Analog Sensor Supply
312C Excavator 3064 Engine Supplement Fuel Priming Pump - Remove and Install
W345B Series II Material Handler Hydraulic System Control Valve (Stick Lowering)
312C Excavator 3064 Engine Supplement Air Conditioner Dryer - Remove and Install
5230B Excavator Hydraulic System Relief Valve (Main) - Test
M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Language Selection
W345B Series II Material Handler Hydraulic System Stick Hydraulic System
5230B Excavator Machine Systems Gear Pump (Pump Drive Lubrication) - Disassemble
M316C, M318C and M322C Excavators and M318C and M322C Material Handlers Filter/Fluid Hours
3500B Engines Electronic Circuits
M325B Material Handler Machine Systems Stick Cylinder - Disassemble
M325B Material Handler Machine Systems Stick Cylinder - Assemble
M325B Material Handler Machine Systems Boom Cylinder - Disassemble
5230B Excavator Machine Systems Gear Pump (Pump Drive Lubrication) - Assemble
W345B Series II Material Handler Hydraulic System Control Valve (Boom Lowering)
M325B Material Handler Machine Systems Boom Cylinder - Assemble
305 CR Mini Hydraulic Excavator Light Switches
325C L and 325C LN Excavator Lifting Capacities Lifting Capacities - 325C Excavator
3500B Engines for 5130B and 5230B Excavators Electrical Power Supply