SENSOR AS-TEMPERATURE 2886820 - Caterpillar

The Tests in this section are designed to establish whether a component and related parts are working properly, and if not, to pinpoint the faulty part.They may be used for basic health checks, to determine if problems exist, or as a guide to check for intermittent problems. Whenever troubleshooting any problem, be sure to check the service history records of the vehicle in order to prevent unnecessary parts swapping.P-500: Inspecting Electrical Connectors Vehicle Circuits TestsP-501: Electrical Power Supply To PEEC IIIP-502: Throttle Position SensorP-503: Diagnostic LampP-504: Vehicle Speed SignalP-505: Cruise Control And PTO SwitchesP-506: Service Brake And Clutch SwitchP-507: Parking Brake SwitchP-508: Coolant Level Sensor Engine Circuits TestsP-510: ECM/Personality ModuleP-511: Sensor Supply VoltageP-512: Engine Speed SignalP-513: Shutoff SolenoidP-514: Boost Pressure SensorP-515: Oil Pressure SensorP-516: Coolant Temperature SensorP-517: Retarder Enable Signal Rack Controls TestsP-520: Dynamic Rack ControlsP-521: Rack Position SensorP-522: Rack Solenoid (BTM) Timing Controls TestsP-530: Dynamic Injection TimingP-531: Timing Position SensorP-532: Timing Solenoid (BTM)P-533: Static Injection Timing Special Features TestsP-540: Idle Shutdown TimerP-541: Multi-TorqueP-542: Power Demand Cruise ControlP-543: Powertrain Data LinkP-500: Inspecting Electrical Connectors
Many of the Operational Procedures and Diagnostic Code Procedures in this troubleshooting guide will direct you to check a specific electrical connector. Use the following steps to help determine if the connector is the cause of the problem. If a problem is found in the electrical connector, repair the connector and continue the test procedure.1. Check Connector Lock Ring Or Allen Screw. Make sure that the connector is properly locked and that the lock ring or allen screw (4mm) is capable of locking the connector together.2. Perform 10 Pound Pull Test On Each Pin/Wire. Each pin and connector should easily withstand 10 pounds of pull, and remain in the connector body. This test checks whether the wire was properly crimped in the pin, and whether the pin was properly inserted into the connector. Repair as needed. Pins should ALWAYS be crimped onto the wires; NEVER soldered.3. Visually Inspect Wiring. Look for worn or abraded wires. Check for pinched or damaged harnesses.4. Visually Inspect Connectors. Verify that pins and sockets are not corroded or damaged. Verify proper alignment and location of pins in the connector.5. Check Individual Pins And Sockets. This is especially important for intermittent problems. Using a new pin, insert the pin into each socket one at a time to check for a good grip on the pin by the socket. Repeat for each pin on the mating side of the connector, using a new socket for the test. P-501: Electrical Power Supply To PEEC III
System Operation
The PEEC III ECM receives electrical power (battery voltage) through wiring supplied by the vehicle manufacturer. In typical applications, PEEC III receives power whenever the key is turned on.Some vehicles may be equipped with an engine protection shutdown system or an idle timer shutdown system (external to PEEC III) that interrupts electrical power to the ECM to shut down the engine. Some of these will not supply power to PEEC III until the engine is cranked, until oil