PULLEY-CRANKSHAFT 1949457 - Caterpillar

Illustration 1 g00935613
Test Step 1. Check for Connector Damage.
Turn the keyswitch to the OFF position.
Thoroughly inspect the ECM connector J1/P1 and the machine connector J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
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 ECM connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the machine connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points.Expected Result:The connectors and wiringare free of the following problems: damage, corrosion, abrasion and incorrect attachment.Results:
OK - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring need repair.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 2. Check the Digital Supply Voltage at the ECM.
Remove the digital supply line on wire A700-OR on pin P1-51 of the ECM. Install a jumper into the socket P1-51.
Remove the digital return line 998-BR on pin P1-9 of the ECM. Install a jumper into the socket P1-9.Note: The digital return will no longer be connected to the other sensors and switches. Additional diagnostic codes will be generated from the ECM. Clear the codes after you complete this test.
Reconnect the ECM connector.
Turn the keyswitch to the ON position. The engine should be off.
Measure the voltage between the wire jumpers in P1-51 and P1-9.
Turn the keyswitch to the OFF position.
Remove the jumpers and replace all wires.Expected Result:The supply voltage is 12.7 1.0 VDC.Results:
OK - The supply voltage is 12.7 1.0 VDC. The digital sensor supply is producing the correct voltage. Proceed to Test Step 3.
Not OK - The supply voltage is not 12.7 1.0 VDC. The digital sensor is not producing the correct voltage.Repair: Perform the diagnostic functional test Troubleshooting, "Electrical Power Supply". Stop.Test Step 3. Check the Digital Sensor Supply Voltage at the Sensor Connector.
Turn the keyswitch to the ON position. The engine should be off.
Measure the digital sensor supply voltage between terminal-A and the digital return terminal-B of all the digital sensors.Expected Result:The supply voltage is 12.7 1.0 VDC.Results:
OK - The supply voltage is 12.7 1.0 VDC. The supply voltage is present at all of the digital sensor connectors. Proceed to Test Step 6.
Not OK - The supply voltage is not 12.7 1.0 VDC. The supply voltage is not correct. There is an open circuit in the harness or in the connectors. Proceed to Test Step 4.Test Step 4. Check for a Short Circuit in the Wiring Harness.
Disconnect ECM connector J1/P1 and all of the digital sensors.
Measure the resistance between the digital supply