GENERATOR GP 5N7066 - Caterpillar

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Illustration 2 g03129657
Location of the connectors that are for the speed control (left rear engine view)
(1) Engine interface connector
(2) J1/P1 ECM connectors
Illustration 3 g01371286
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
(P1-70) Keyswitch
Illustration 4 g01371296
Terminal locations at the engine interface connector that are for the speed control
(Terminal 2) −Battery
(Terminal 4) Secondary throttle signal
(Terminal 10) Primary throttle signal
(Terminal 30) Keyswitch
Illustration 5 g01159881
Terminal locations at the connector for the throttle position sensor
(Terminal A) −Battery
(Terminal B) Keyswitch
(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 engine interface connector that are associated with the circuit.
C. Check the allen head screw on each ECM connector and the engine interface 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.
All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.
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.
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.
The status is zero percent when the throttle is in the lowest position of travel. The status progressively increases to 100 percent when the throttle is in the highest position of travel.
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.
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