LINES GP-PILOT 2221180 - Caterpillar

The Electronic Control Module (ECM) can be configured to receive two different types of throttle signals for the engine throttle control:
CAN Input - A J1939 signal is received via the CAN data link.
PWM - The Pulse Width Modulated signal (PWM) must be received via terminal P1-66 at the ECM connector. If direct fuel control mode is used on the engine, the PWM signal must be received via terminal P1-66 at the ECM connector.The ECM also allows a primary throttle and a secondary throttle to be configured for the engine if direct fuel control mode is disabled. The type of signal that will be used for the primary throttle is configured by setting the "Desired Speed Input Configuration" parameter. The type of signal that will be used for the secondary throttle is configured by setting the "Secondary Desired Speed Input Configuration" parameter. Configuring both of these parameters to the same setting will invalidate the setting for the secondary throttle.The ECM will utilize the signal that is defined as the primary throttle as long as a valid signal is available from the expected source. If the signal from the primary throttle becomes unavailable, the ECM will use the signal that is defined as the secondary throttle. If both throttle signals become unavailable, the ECM uses the rated speed of the engine as the setpoint for the desired engine speed.For using an electronic external governor for engine control, the "Direct Fuel Control Mode" parameter must be enabled. The ECM input at P1-66 must be used for direct fuel control of the engine. Refer to Troubleshooting, "Direct Fuel Control Mode - Test" for additional information.
Illustration 1 g03889309
Table 3
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step 2.
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all the seals are properly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 2.
2. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A -4 code is active or logged.
Proceed to Test Step 3.
Result: A -3 code is active or logged.
Proceed to Test Step 7.
3. Check the Wiring for an Open Circuit
A. Turn the main disconnect switch to the OFF position.
B. Disconnect the J1 connector from the electronic Control Module (ECM).
C. Remove the signal wire at terminal 66 of the Engine Interface Connector (EIC).
D. Measure the resistance between the following terminals:
- P1-66 (ECM) and P1-66 (EIC)
Open Circuit
Result: There were less than 10 ohms of resistance.
Proceed to Test Step 4.
Result: There were more than 10 ohms of resistance.
Repair: An open