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Oil Pressure Voltage High - Diagnostic Code: SPN 100 - FMI 3 (On-Highway Trucks)

Oil Pressure Voltage High (100-3)

Figure 1.1 - Check Engine Lamp (Dash Panel)

#Conditions Which Generate This Code:
The Engine Control Module (ECM) detects the following conditions:
→The signal voltage from the Engine Oil Pressure Sensor is greater than 4.95 Vdc for more than eight seconds.
→The ECM has been powered for at least two seconds.
→The 168-01 Low ECM Battery Power is not active.
→The 232-03 (5 Volt Supply voltage high is not active).
→The 232-04 (5 Volt Supply voltage low is not active).
→The Engine is not running or the Engine Coolant Temperature is greater than 38 °C (100 °F).

#System Response:
The ECM will log the Diagnostic Code and the ECM will trigger a snapshot. The Check Engine Lamp will illuminate once this Diagnostic Code has been active for more than ten hours. The ECM will default to 600 kPa (88 psi) for Engine Oil Pressure.

#Possible Performance Effect:
None

#Troubleshooting:
The Engine Control Module (ECM) continuously creates a Pull-up voltage on the signal wire for each sensor. The ECM uses this Pull-up voltage in order to detect a problem in the signal circuit. When the ECM detects voltage that is above a threshold on the signal wire, the ECM activates a high voltage -3 Diagnostic Code. When the ECM detects voltage that is below a threshold on the signal wire, the ECM activates a low voltage -4 Diagnostic Code.

The most likely cause of a code is a problem with an electrical connector or wiring. The least likely cause of a code is the ECM.

Test Step 1. Determine if the Code is Logged or Active
A. Connect CAT ET to the Service Tool connector. Read More: How to Connecting Caterpillar ET Software to the ECM.
B. Restore electrical power to the Engine ECM.
C. Monitor the Active Diagnostic Code and the Logged Diagnostic Codes on CAT ET. Wait at least 30 seconds in order for Diagnostic Codes to become active. Identify the Diagnostic Code.
Figure 1.2 - Oil Pressure Voltage High (100-3)

Test Step 2. Check the Integrity of the Connections at the Connectors
A. Restore the electrical power to the ECM. Do not start the Engine.
B. Check for an Intermittent Problem at the Connector for the Suspect Sensor and ECM Connector:
→Carefully install the spoons (multimeter probes) into the terminal locations for the sensor supply and the sensor return at the appropriate ECM connector (P2/J2 - 24).
→While you observe the voltage reading on the multimeter, wiggle the wires and pull on the wires at the connector for the suspect sensor. The voltage reading will not vary more than 0.5 volts for a solid electrical connection.
→Remove the spoons (multimeter probes) from the connector.
C. Remove the electrical power from the ECM.

Test Step 3. Check the Supply Voltage at the Sensor Connector
Measure the voltage between terminal 1 (sensor supply) and terminal 2 (sensor return) at the harness connector for the sensor that relates to the code.
Expected Result: The voltage is between 4.5 VDC and 5.5 VDC.

Test Step 4. Check for Battery Voltage on the Signal Wire
Measure the voltage between the signal terminal and the return terminal on the harness connector for the sensor that relates to the diagnostic code.
Expected Result: The voltage measurement is less than the +Battery voltage.

Test Step 5. Check the Signal Wire for an Open Circuit
A. Disconnect the sensor that relates to the Diagnostic Code.
B. Connect a jumper wire between the signal terminal and the return terminal on the harness connector for the sensor that relates to the Diagnostic Code. This will replace the sensor with a short circuit.
C. Look for a -4 Diagnostic Code (100-4).
Figure 1.3 - Oil Pressure Voltage Low (100-4)
D. Replace the Engine Oil Pressure Sensor, with CAT P/N: 276-9067.
Figure 1.4 - Engine Oil Pressure Sensor


#Engine Monitoring Mode
The Engine Monitoring System provides built-in Engine monitoring that can detect abnormal Oil Pressure, High Intake Manifold Air Temperature, High Coolant Temperature and if an optional Coolant Level Sensor is installed, Coolant Level. Typically, an additional Warning Lamp (refer to Figure 1.1 above) is installed in the dash for driver notification. The Engine Monitoring System can be programmed to one of four different settings:
Off - Monitoring System is Off
Warning - The Warning Lamp on the dash turns On
Derate - The Warning Lamp on the dash turns On and Engine power is reduced
Shutdown - The Warning Lamp on the dash turns On, Engine power is reduced, then the Engine shuts down.

Accessing Configuration - Engine Monitoring Parameters on CAT ET.
Figure 1.5 - Engine Monitoring Mode (Warning)

Abnormal Oil Pressure - Engine Oil Pressure is monitored for all rpm and loads. For example, this can help prevent excessive damage if the Engine is started without oil or if the Oil Pressure is too low during a heavy pull. Power and speed (Engine rpm) are limited during the derate period following the warning if the Derate or Shutdown settings are programmed. If the low Oil Pressure condition persists, the Engine will shutdown if the Shutdown setting is active.


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