HEAD GP-HYDRAULIC CYLINDER 4944318 - Caterpillar

The ether injection system will improve cold weather starting of the engine. The engine Electronic Control Module (ECM) controls the ether injection system. The ether injection system is disabled if there is an active engine shutdown.Activation of the ether starting aid is based from a map using the coolant temperature, intake manifold temperature, and atmospheric pressure. Refer to Illustration 1.
Illustration 1 g02445796
The following conditions must be met for the ether injection system to be enabled:
Ether injection is set to enabled in Cat ET
Engine coolant temperature is less than the "Start Aid Selection Temperature - Coolant". Refer to Illustration 1.
Intake manifold temperature is less than the "Start Aid Selection Temperature - IMAT."
Coolant temperature and intake manifold air temperature are within 11° C of each other.Industrial Application Schematic
Illustration 2 g03344006
Machine and Electric Power Applications Schematic
Illustration 3 g02462932
Schematic of the ether injection system
Illustration 4 g01696575
Ether starting aid group (typical example) (1) Ether injection solenoid
Illustration 5 g01155187
Terminal locations at the harness connector for the ether solenoid (1) Ether enable solenoid (2) Return for ether injection solenoid
Table 2
Troubleshooting Test Steps    Values    Results    
1. Inspect Electrical Connectors and Wiring
A. Remove the electrical power from the ECM.
B. Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors for the circuit. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a
45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
D. Check the ECM connector (allen head screw) for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect".
E. Check the harness and the wiring for abrasion and for pinch points.
   
Loose connection or damaged wire    
Result: The harness and wiring are OK.
Proceed to Test Step 2.
Result: There is a problem in the connectors and/or wiring.
Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled. Proceed to Test Step 4.
   
2. Check the Wiring Between the ECM and the Ether Control
The ether canister must be removed prior to performing this procedure.
A. Verify that the keyswitch is in the OFF position.
B. Remove the ether canister.
C. Disconnect the engine harness connector for the ether control.
D. On a Machine and Electric Power applications, measure the voltage between the two terminals on the engine harness connector for ether control.
On an Industrial application, measure the voltage between terminal 1 on the engine harness connector for ether control and a know good ground source.
E. Turn the keyswitch to the ON position.
F. Measure the voltage while the keyswitch is turned ON.
    10 VDC    
Result: The voltage measured 0 VDC.
There is a problem in an electrical component between the ECM and the harness connector for the ether control. The problem may be inside an electrical connector. Make the necessary repairs. Proceed to Test Step 3.
Result: The voltage measured greater than 10 VDC.
The electrical components between the ECM and the harness connector for the ether control