BEARING 4397629 - Caterpillar

Illustration 2 g01377328
Location of the connectors that are for the speed control (rear engine view)
(1) J1/P1 ECM connectors
(2) Customer connector
Illustration 3 g01377645
Terminal locations at the P1 ECM connector that are for the speed control
(P1-61) −Battery
(P1-66) Primary throttle signal
(P1-68) Secondary throttle signal
Illustration 4 g01377380
Terminal locations at the customer connector that are for the speed control
(Terminal 2) −Battery
(Terminal 4) Secondary throttle signal
(Terminal 10) Primary throttle signal
Illustration 5 g01159881
Terminal locations at the connector for the throttle position sensor
(Terminal A) Keyswitch
(Terminal B) −Battery
(Terminal C) Throttle signal
Table 3
Troubleshooting Test Steps Values Results
2. Inspect the Electrical Connectors and the Wiring
A. Thoroughly inspect connectors (1) and (2)). Also, thoroughly inspect all of the other connectors that are in the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect", for details that are related to inspection of the electrical connectors.
B. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the customer connector that are associated with the circuit.
C. Check the allen head screw on each ECM connector and the customer connector for the proper torque. refer to Troubleshooting, "Electrical Connectors - Inspect", for the correct torque values.
D. Check the harness and the wiring for abrasion and for pinch points.
Connectors, Pins, and Sockets
Result: The connectors and wiring appear to be OK. Proceed to Test Step 3.
Result: The connectors and/or wiring are not OK.
Repair the connectors or wiring and/or replace the connectors or wiring.
STOP
3. Check the Status for "Throttle Position"
A. Connect Cat ET to the service tool connector.
B. Restore electrical power to the ECM.
C. Observe the status for "Throttle Position" on Cat ET while you operate the throttle that is for the suspect sensor through the entire range of travel.
D. Remove electrical power from the ECM.
Throttle
Result: The throttle position sensor is working properly.
There may be an intermittent electrical problem with the harness or the connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect", if an intermittent electrical problem is suspected.
STOP
Result: The throttle position that is displayed on Cat ET does not correspond to the movement of the throttle. Proceed to Test Step 4.
4. Check the Supply Voltage at the Sensor
A. Disconnect the suspect throttle position sensor at the harness connector.
B. Restore electrical power to the ECM. Turn the keyswitch to the ON position.
C. Measure the voltage across terminal A (+Battery) and terminal B (−Battery) on the harness side of the connector.
D. Remove electrical power from the ECM. Turn the keyswitch to the OFF position.
E. Restore the wiring to the original configuration.
The supply voltage measures 24 2 VDC at the sensor connector.
Result: The correct supply voltage is measured at the sensor connector. The sensor is receiving the correct supply voltage. Proceed to Test Step 5.
Result: The voltage is not correct at the sensor connector.
There is a problem in the keyswitch circuit that is between the ECM and the throttle position sensor. Repair the circuit. Refer to the Schematic for the electrical system for information. If a problem is suspected with the keyswitch circuit that is for the engine, refer to Troubleshooting, "Electrical Power Supply -