TURBOCHARGER GP 4947640 - Caterpillar

Illustration 5 g01625194
Connections for the ECM terminals (17) +8 Volt DC Supply (44) Sensor Common (56) Battery + (57) Battery + (if connected) (68) Battery - (69) Battery - (if connected)
Turn the keyswitch to the OFF position.
Remove P1:17 and P1:44 from the ECM connector P1.
Turn the keyswitch to the ON position.
Use the electronic service tool to check for active diagnostic codes.Expected Result:The ECM is not working correctly.The cable between the ECM and the throttle position sensor is faulty.The diagnostic codes are active.Results:
OK - Check for proper battery voltage.Repair: Check the battery voltage from P1:56 and P1:57 to P1:68 and P1:69. Terminals P1:57 and P1:69 are not used in some installations.The voltage should be between 11.0 to 13.5 Volts DC for a 12 Volt system. The voltage should be between 22.0 to 27.0 Volts DC for a 24 Volt system. If the battery voltage is correct and diagnostic codes are still active, then the ECM does not operate correctly.
Temporarily connect a test ECM.Note: The test ECM should be programmed with the correct software. All parameters should be set to the same value as the suspect ECM.
If the fault is eliminated with the test ECM, reconnect the suspect ECM.
If the fault returns with the suspect ECM, then the suspect ECM is faulty.
Replace the suspect ECM.The diagnostic codes are no longer active.STOP
Not OK - There is a short circuit in the harness or connectors.Repair: Perform the following procedure:
Connect the cables one at a time.
Connect P1:44.
Check if the diagnostic code reappears.
Connect P1:17.
Use the electronic service tool to check if the diagnostic code reappears.
Replace the faulty cable.Verify that the repair has eliminated the fault.STOPTest Step 8. Check the Position of Throttle Position Sensor
Turn the keyswitch to the OFF position.
Install a Breakout T with 3 terminals to the throttle position sensor.
Turn the keyswitch to the ON position.
Use a multimeter that has a setting for frequency or duty cycle to measure the PWM signal. Connect one probe to terminal C (throttle position sensor) and the other probe to terminal B sensor common of the Breakout T.
Observe the position while the engine speed control is moved from the minimum to the maximum position.Expected Result:The position should be between 10 and 22 percent in the low idle position.The position should be between 75 and 90 percent in the high idle position.Results:
OK - The throttle position is working correctly. Proceed to Test Step 9.
Not OK - The throttle position sensor is faulty. Proceed to Test Step 10.Test Step 9. Check the Throttle Position Sensor at the ECM
Illustration 6 g01735254
Connections of the ECM terminals (16) Throttle Position (44) Sensor Common
Turn the keyswitch to the OFF position.
Remove terminal P1:16.
Connect a multimeter that has a setting for frequency or duty cycle to terminal P1:16 and terminal P1:44.
Turn the keyswitch to the ON position.
Use the multimeter to measure the output signal of the throttle position sensor while the engine speed control is moved from the minimum position to the maximum position.
Turn the keyswitch to the OFF position and connect terminal 16 to the P1