Mack Engine Code – 4813 Engine Oil Thermostat Bypass Valve
Details
- Park vehicle on level surface, turn ignition OFF, set parking brake and block wheels.
- Connect scan tool, turn ignition ON with engine OFF and record all circuit related active and inactive fault codes. Turn ignition OFF. Go to next step.
NOTE: If multiple active fault codes are present an open or shorted supply, return, or ground circuit that shares supply, return, or ground is possible.
- Verify there is no visible damage to component. Ensure correct Engine Oil level/proper component operation.
Repair/replace faulty components. Go to step 12. If components are good go to next step. - Disconnect ECM EB connector and inspect wiring harness connectors and Terminals for damage, moisture, proper Terminal tension, and corrosion. If damage is found, clean and repair as required. Go to step 11. If no damage is found, go to next step. .
- Disconnect Engine Thermostat Bypass Valve harness connector and inspect wiring harness connectors and Terminals for damage, moisture, proper Terminal tension, and corrosion. If damage is found, clean and repair as required. Go to step 11. If no damage is found, go to next step.
- Connect ECM EB connector. Disconnect Engine Oil Thermostat Bypass Valve harness connector. Turn ignition ON. Measure voltage between Engine Oil Thermostat Bypass Valve harness connector Terminal 1 & 2. Record voltage measurement. Turn ignition OFF. If voltage is 12 Volts, replace sensor. Go to step 11. If voltage is NOT 12 Volts, inspect Fuse and replace if defective. If defective fuse is found, replace and repeat Step. Go to next step.
NOTE: Measure towards ECM.
- With ECM EB connector and Engine Oil Thermostat Bypass Valve harness connector disconnected, measure sensor resistance between Engine Oil Thermostat Bypass Valve Terminal 1 and 2 of sensor connector. Verify resistance is less than 10 Ohms. If resistance is more than 10 Ohms, clean/replace sensor. Go to step 11. If resistance is less than 10 Ohms, go to next step.
NOTE: Measure towards sensor.
- With ECM EB connector, Fuse 43 remove and Engine Oil Thermostat Bypass Valve harness connector disconnected, measure resistance between Engine Oil Thermostat Bypass Valve Terminal 1 harness connector and a good ground. Repeat this step for Engine Oil Thermostat Bypass Valve Terminal 2 harness connector. If resistance is less than 100K Ohms, repair short to ground. Go to step 11. If resistance is more than 100K Ohms, go to next step.
NOTE: Measure towards ECM.
- With ECM EB connector and Engine Oil Thermostat Bypass Valve harness connector disconnected, measure ground circuit resistance between ECM EB53 harness connector and Engine Oil Thermostat Bypass Valve Terminal 2 harness connector. If resistance is more than 10 Ohms, repair or replace open circuit or excessive resistance in harness, go to step 11. If resistance is less than 10 Ohms, go to next step.
NOTE: Measure across harness.
- With ECM EB connector and Engine Oil Thermostat Bypass Valve harness connector disconnected, measure signal circuit resistance between ECM Oil Thermostat Valve, EB53 and all other Terminals on ECM EB Connector Harness connector. Verify resistance is less than 10 Ohms. Repeat this step for ECM EA Connector. If resistance is more than 10 Ohms, repair open in harness and go to step 11. If resistance is 10 Ohms, go to next step.
NOTE: Measure towards harness.
- Connect ECM EB and Engine Oil Thermostat Bypass Valve harness connectors, go to next step.
- Clear fault codes and verify code is NOT active. If code is still active, repeat diagnostics to verify diagnostics were performed correctly. If code is still active, contact an authorized OEM service center for authorization to replace ECM.
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