CRANKSHAFT 2P7850 - Caterpillar

System Operation Description:Use this procedure to troubleshoot any suspect problems with the ether injection system.The ether injection system is used as starting aid for the engine. The ether injection system can operate in auto mode, or manual mode. Auto mode is the normal setting for the system.When the ether injection system is in auto mode, the Electronic Control Module (ECM) controls the ether injection system.The ether injection system can also be operated in manual mode when the auto/manual switch is held in the ON position (momentary contact). The ether system is switched into manual mode whenever the auto/manual switch is depressed. Manual mode allows ether to be injected whenever the coolant temperature is less than 18 °C (64 °F) and engine rpm is greater than 50 rpm. The manual mode will inject ether for a duration that is dependent on the coolant temperature. The manual ether injection system is disabled whenever engine rpm exceeds 400 rpm or the engine coolant temperature exceeds 18 °C (64 °F).
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Schematic for the ether injection system
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Breathing ether vapors or repeated contact of ether with skin can cause personal injury. Personal injury may occur from failure to adhere to the following procedures.Use ether only in well ventilated areas.Do not smoke while changing ether cylinders.Use ether with care to avoid fires.Do not store replacement ether cylinders in living areas or in the operator's compartment.Do not store ether cylinders in direct sunlight or at temperatures above 49 °C (120 °F).Discard cylinders in a safe place. Do not puncture or burn cylinders.Keep ether cylinders out of the reach of unauthorized personnel.To avoid possible injury, be sure the brakes are applied and all controls are in Hold or Neutral when starting the engine.
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Location of the J1/P1 ECM connector (typical engine view)
(1) J1/P1 ECM connectors
Illustration 3 g01210753
Location of the engine interface connector (typical engine view)
(2) Engine interface connector
Thoroughly inspect connectors (1) and (2). Also, thoroughly inspect all of the other connectors that are in the circuit. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
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Terminal locations at the P1 ECM connector
(P1-5) Digital return
(P1-18) Ether solenoid
(P1-20) Solenoid return
(P1-22) Auto/manual switch
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Terminal locations for the auto/manual switch at the engine interface connector
(9) Auto/manual switch
(15) Digital return
Illustration 6 g01155187
Terminal locations at the ether solenoid
(1) Solenoid return
(2) Ether solenoid
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for correct torque values.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with