0591841 JOHNSON NIPPLE & VALVE ASSEMBLY

Table 1
J1939 Code and Description CDL Code and Description Comments
626-5
Engine Start Enable Device 1 : Current Below Normal 2417-5
Ether Injection Control Solenoid : Current Below Normal The code is latched. The code is logged.
Ether injection is disabled.
626-6
Engine Start Enable Device 1 : Current Above Normal 2417-6
Ether Injection Control Solenoid : Current Above Normal The code is latched. The code is logged.
Ether injection is disabled. The ether injection system will improve cold weather starting of the engine. The A6:E2 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 g02445796The following conditions must be met for the ether injection system to be enabled:
Ether injection is set to enable in Cat® Electronic Technician (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.
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to OFF.
B. Thoroughly inspect the ECM connectors J1/P1 and J2/P2 and check for connector torque. Inspect all the other connectors for the circuit. Refer to 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 harness and the wiring for abrasion and for pinch points.
Connectors and Wiring
Result : The harness and wiring are OK.
Proceed to Test Step 2.
Result : There is a problem in the connectors and/or wiring.
Repair : Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all 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. Turn the keyswitch to OFF.
B. Remove the ether canister.
C. Disconnect the engine harness connector for the ether control.
D. Connect a digital voltmeter across the following J1 pins:
- Pin-38 (Digital Return) to Pin-79 (Ether Solenoid)
E. Turn the keyswitch to ON.
F. Measure the voltage across the terminals while the keyswitch is turned ON.
10 VDC
Result : The voltage measured 0 VDC.
Repair : 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.
Repair : The electrical components between the ECM and the harness connector for the ether control are OK.
Proceed to Test Step 3.
3. Measure the Resistance of the Coil Inside the Ether Control
A. Verify that the ether control is not connected to the engine harness.
B. Measure the resistance of the coil inside the ether control.
20 Ω
Result : The measured resistance was approximately 20 Ω.
Proceed to Test Step 4.
Result : The measured resistance was not approximately 20 Ω.
Repair : Replace the ether control. Proceed to Test Step 4.
Illustration 2 g02462341
Retracted plunger
Illustration 3 g02462343
Extended plunger
Table 3
Troubleshooting Test Steps Values Results
4. Verify the Repair
A. Activate the "Ether Injection Override".
B. Verify that the plunger moved up when the override was active.
Plunger Movement
Result : The plunger moved up when the override was active.
Repair : Install the ether bottle and return the unit to service.
If this procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solution Network (DSN).