92577M Mariner COVER, AIR INTAKE (OUTER)

Table 1
Event Code
Description Conditions which Activate the Code System Response
E266(3) Low Hydrax Oil Pressure The crank terminate relay has been energized for at least 30 seconds. The pressure switch for the electrohydraulic actuator system opens for more than one second. The open switch indicates no oil pressure to the system. The fuel is shut off. The shutdown output is activated. The code is logged. Probable Causes
Incorrect setting of the pressure relief valve
Stuck pressure relief valve
Insufficient oil pressure
Open electrical circuit for the hydraulic oil pressure switchRecommended Actions
Setting of the Pressure Relief Valve
Check the setting of the pressure relief valve. For instructions, refer to Systems Operation/Testing and Adjusting, "Engine Governing - Adjust". Adjust the pressure relief valve, if necessary.Check the Pressure Relief Valve
If the pressure relief valve is dirty, the valve can become stuck. If the pressure relief valve is stuck in the open position, the hydraulic oil pressure will be too low.If you suspect that the pressure relief valve is stuck, disassemble the valve and clean the parts. Check the relief valve that is located on the hydraulic pump for leakage and/or adjustment. Replace parts, if necessary.Low Hydraulic Oil Pressure
Check the hydraulic oil level. Observe the oil level in the sight gauge on the tank. If necessary, pour oil into the tank until the oil level is between the "ADD" and "FULL" marks on the sight gauge.The hydraulic oil pressure switch must be closed to return J2-53 for ECM input J2-70. If this contact is not closed, the engine will not start and the ECM will not generate a code.The hydraulic oil pressure switch must remain closed during engine operation. Use a gauge to check the oil pressure of the electrohydraulic system at the outlet for the hydraulic pump while the engine is cranking. Check the pressure while the engine is at normal operating temperature, when possible. Compare the pressure to the pressure that is described in Systems Operation/Testing and Adjusting, "Engine Governing - Adjust".If the pressure is too low, inspect the electrohydraulic system for leaks. Inspect the hydraulic pump. Make repairs, as needed.Open Electrical Circuit
Open Circuit in the Hydraulic Oil Pressure Switch
Check for proper operation of the hydraulic oil pressure switch. Disconnect the engine harness from the switch. Apply a known pressure to the electrohydraulic system. While you apply the pressure, use an ohmmeter between terminals "A" and "B" on the switch. Observe the status of the switch contact. If the switch does not function properly, replace the switch.Open Circuit in the Harness for the Hydraulic Oil Pressure Switch
Use the following procedure to check the harness. Do not operate the engine during this procedure.
Turn the engine control switch to the STOP position.
Disconnect the harness connector from the pressure switch. Use Cat ET to observe the "Hydrax Pressure Switch Status". The status of the switch should be "Open".
Attach a jumper wire between terminals "A" and "B" on the harness connector.
Use Cat ET to observe the "Hydrax Pressure Switch Status". The status of the switch should be "Closed".
Continue to observe the "Hydrax Pressure Switch Status". Wiggle the harness from the harness connector to the ECM. The status of the switch should still be "Closed".If the "Hydrax Pressure Switch Status" momentarily changes to "Open", the harness has an intermittent circuit.If there is an intermittent circuit, locate the problem. Make repairs to the harness, when possible. After the harness is repaired, remove the jumper wire from the 3-pin connector. Reconnect the connector.If the harness cannot be repaired, replace the harness.