CONTROL GP-FOOT BRAKE 3155037 - Caterpillar

This engine uses high voltage to control the fuel injectors.Disconnect electronic fuel injector enable circuit connector to prevent personal injury.Do not come in contact with the fuel injector terminals while the engine is running.
Turn the keyswitch to the OFF position.
Turn the circuit breaker for the battery to the OFF position.
Disconnect ECM connector J2/P2 and the injector connectors J4/P4 through J11/P11.
Measure the resistance at the ECM connector P2 between the following pins:
P2-16 and P2-5
P2-32 and P2-5
P2-26 and P2-17
P2-38 and P2-17
P2-37 and P2-27
P2-30 and P2-27
P2-31 and P2-39
P2-36 and P2-39Expected Result:The resistance should be greater than 20,000 Ohms.Results:
OK - The resistance was greater than 20,000 Ohms. Proceed to test step 6.
Not OK - The resistance was less than 20,000 Ohms.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 6. Check for a Short Circuit from the Harness to the Engine Ground.
This engine uses high voltage to control the fuel injectors.Disconnect electronic fuel injector enable circuit connector to prevent personal injury.Do not come in contact with the fuel injector terminals while the engine is running.
For the 3508B, measure the resistance between the following sockets at ECM connector P2 and the engine ground: P2-5, P2-16, P2-17, P2-26, P2-27, P2-30, P2-31, P2-32, P2-36, P2-37, P2-38 and P2-39.Expected Result:The resistance should be greater than 20,000 Ohms.Results:
OK - The resistance is greater than 20,000 Ohms. Proceed to test step 7.
Not OK - The resistance is less than 20,000 Ohms.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 7. Check for an Open Circuit in the Harness.
Use a suitable piece of wire to short socket 1 to socket 2 at each injector connector.
Measure the resistance at the ECM connector P2 between the power output for the individual solenoid and the solenoid return.Expected Result:The resistance should be less than 10 Ohms.Results:
OK - The resistance is less than 10 Ohms. Proceed to test step 8.
Not OK - The resistance is greater than 10 Ohms.Repair: There is an open wire or excessive resistance in the circuit. Repair the connectors or wiring and/or replace the connectors or wiring. Stop.Test Step 8. Measure the Resistance at the Valve Cover Base.
Personal injury can result from high voltage.The Electronic Control Module produces high voltage.Make sure the Electronic Control Module is not powered and the fuel injector solenoids are disconnected before proceeding.
Turn the keyswitch to the OFF position.
Turn the circuit breaker for the battery to the OFF position.
Ensure that the ECM connector J2/P2 is disconnected. Ensure that the injector connectors J4/P4 through J11/P11 are disconnected.
Measure the solenoid resistance between pin 1 and pin 2 at the injector connectors J4 through J11.
Record the measured resistance for each solenoid.Expected Result:The resistance should be between 0.5 and 1.5 Ohms.Results:
OK - The resistance is between 0.5 and 1.5 Ohms. Proceed to test step 9.
Not OK - The resistance is not between 0.5 and 1.5 Ohms. Proceed to test step 10.Test Step 9. Perform the Injector Solenoid Test.Note: This test will help the service technician verify that the ECM can