CYLINDER AS 9T2715 - Caterpillar

Electrical Circuit
Indication of the Condition
There are no problems with the pressurized air. However, the air temperature control does not operate.Probable Causes
Interruption of the power source
Low voltage
Problems with the wiring and/or connections
Faulty temperature switch
Faulty solenoidRecommended Repairs
Check for an open circuit breaker. If the electrical system has fuses, inspect the fuses for good condition and secure connections.Expected ResultThe circuit breaker is closed. No fuses are blown. No fuses are loose.OK - The power source does not seem to be interrupted. Proceed to Step 2.Not OK - The power is obviously interrupted.Restore the power. Close the circuit breaker. Replace the fuse (if equipped) or install the loose fuse securely. Correct the cause of the opened circuit breaker or the blown fuse.
Use a multimeter to check the +battery voltage from the source.Expected ResultThe +battery voltage is approximately 24 VDC.OK - The +battery voltage is approximately 24 VDC. Proceed to Step 3.Not OK - The +battery voltage is not approximately 24 VDC.Determine the cause of the low voltage. Correct the condition.
An electrical shock hazard is present. An electrical shock can cause severe personal injury or death.System power must be disconnected. Turn the engine control switch to the "OFF/RESET" position. Open the circuit breaker for the electrical power supply.
Inspect the wiring and the electrical connections:
Illustration 14 g00756684
(1) Conduit (2) Solenoid (3) Temperature switch (W1) Wire between the +battery side and the temperature switch (W2) Wire between the temperature switch (+battery side) and the solenoid (W3) Wire between the solenoid and the ground
Remove power from the control system.
Inspect the electrical connectors for proper mating. Check the connectors for moisture and/or corrosion.
Perform a pull test on each wire connection. Each terminal and each connector should easily withstand 45 N (10 lb) of pull and each wire should remain connected.
Carefully inspect each wire for signs of abrasion, nicks, or cuts. Inspect the wiring for fraying, missing insulation, and pinch points.The following areas are likely locations of damage to wires:
Places with exposed insulation
Places with wire that rubs against an object
Check all of the hold down clamps for the wiring in order to verify that the wiring is properly clamped. Verify that the wiring is not compressed by the clamps. Check for flattening of the wires by the clamps.Expected ResultThe following conditions are found:
The connections and the wiring is free of corrosion.
The connections are secure and free of damage.
The connections withstand 45 N (10 lb) of pull.
The wires do not have abrasion, nicks, cuts, or pinch points.
The wiring is properly clamped.OK - All connectors are properly mated and free of damage. The connections and the wiring are free of corrosion. Each connection easily withstands 45 N (10 lb) of pull. The wires are free of abrasion, nicks, cuts, and pinch points. The wiring is properly clamped. Proceed to Step 4.Not OK - A problem with a connection and/or the wiring is found.If moisture or corrosion is evident, the source of the moisture entry must be found and the source of the moisture entry must be repaired. If the repair is