CARTRIDGE GP-TURBOCHARGER 1964155 - Caterpillar

Illustration 1 g00995018
Schematic for 10 V supplyThis diagnostic code is recorded when the ECM reads the voltage of the voltage supply (799-WH) and the voltage is below normal.System Response:Components that receive power from the voltage supply will not be available.Test Step 1. CHECK THE VOLTAGE AT THE ECM.
Turn the disconnect switch and the key start switch to the ON position.
Check the voltage at the connector of the ECM from contact J1-69 (voltage supply) to contact J1-70 (ground). Use the 7X-1710 Cable probes to measure the voltage. Do NOT disconnect the machine harness from the ECM. Expected Result:The voltage is 10.0 0.5 DCV.Results:
OK - The voltage is 10.0 0.5 DCV. The supply voltage is correct. Verify that the diagnostic code is present. If the diagnostic code is still present the ECM has failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NOT OK - Voltage is NOT 10.0 0.5 DCV. The voltage is less than 10.0 0.5 DCV. The supply voltage is NOT correct. Proceed to test step 2.Test Step 2. CHECK FOR A SHORT TO GROUND.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the ECM.
At the harness connector for the ECM, measure the resistance between frame ground and contact J1-69 of the supply circuit. Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. The ECM has failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NOT OK - The resistance is less than 5000 ohms. The machine harness or a PHS control has failed. Proceed to test step 3.Test Step 3. DISCONNECT THE PHS CONTROL.
The key start switch and the disconnect switch remain in the OFF position.
One at a time, disconnect the PHS control that uses the supply voltage from the machine harness.
After disconnecting the connector from the control(s), check the resistance from frame ground to contact J1-69 (supply voltage) of the machine harness connector for the ECM.Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. The control that was just disconnected has failed.Repair: Replace the sensor. Stop.
NOT OK - The resistance is less than 5000 ohms. If the resistance is less than 5000 ohms after all the sensors have been disconnected from the machine harness. The machine harness is shorted to ground.Repair: Repair the machine harness or replace the machine harness. Stop.