PUMP GP-AUXILIARY SEA WATER 1230470 - Caterpillar

Table 2
Troubleshooting Test Steps Values Results
1. Determine the Diagnostic Code
A. Establish communication between Cat ET and the "Engine #1 Aftertreatment Controller". Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Record the logged codes or the active codes.
Diagnostic code
Result: A 2771-7 code is logged or active.
Proceed to Test Step 2.
Result: A 2771-3 or a 2771-4 code is logged or active. There is a problem with the wiring between the A5:E2 aftertreatment controller and the TCBV.
Proceed to Test Step 6.
Result: A 2771-6 code is logged or active. There is a problem with the wiring between the A5:E2 aftertreatment controller and the TCBV.
Proceed to Test Step 9.
Result: A 2771-5 code is logged or active. There is a problem with the wiring between the A5:E2 aftertreatment controller and the TCBV.
Proceed to Test Step 10.
2. Inspect the Wiring to the Turbocharger Compressor Bypass Valve (TCBV)
A. Inspect the wiring from the A5:E2 aftertreatment controller to the TCBV.
B. Check all connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Check the wires for damage to the insulation.
D. Inspect the wires for the following conditions:
1. Exposed insulation
2. Rubbing of a wire against the engine
3. Rubbing of a wire against a sharp point
E. Perform a pull test on each wire terminal connection. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Damaged wire or connector
Result: A damaged wire or damaged connector was not found.
Proceed to Test Step 3.
Result: A damaged wire or damaged connector was found.
Repair the damaged wire or the damaged connector. Proceed to Test Step 3.
3. Perform the "Turbocharger Compressor Bypass Valve Test"
A. Perform the "Turbocharger Compressor Bypass Valve Test" in Cat ET.
Test completed successfully
Result: The "Turbocharger Compressor Bypass Valve Test" passed.
Proceed to Test Step 11
Result: The "Turbocharger Compressor Bypass Valve Test" failed.
Proceed to Test Step 4.
Illustration 2 g03765616
(1) Turbocharger Compressor Bypass Valve
(2) Engine Turbocharger
Table 3
Troubleshooting Test Steps Values Results
4. Inspect the Piping Between the Compressor and the TCBV
A. Inspect the tube between the compressor and the TCBV.
B. Check for cracks in the tubing.
C. Check for loose hardware or damaged hardware.
D. Check the clamps on the tube. Make sure that the clamps are tight.
Damaged tubing
Result: The tube is damaged or cracked.
Replace the tubing or repair the tubing. Proceed to Test Step 5.
Result: The tube is not damaged or cracked.
Replace the Turbocharger Compressor Bypass Valve.
Proceed to Test Step 5.
5. Perform the "Turbocharger Compressor Bypass Valve Test"
A. Perform the "Turbocharger Compressor Bypass Valve Test" in Cat ET.
Test completed successfully
Result: The "Turbocharger Compressor Bypass Valve Test" passed.
Proceed to Test Step 11.
Result: The "Turbocharger Compressor Bypass Valve Test" failed.
Replace the Turbocharger Compressor Bypass Valve. Verify the repair by repeating the "Turbocharger Compressor Bypass Valve Test in CAT ET". Proceed to Test Step 11.
6. Check the Voltage on the TCBV Circuit
A. Turn the keyswitch to the OFF position.
B. Verify that the harness connector is free of debris, free of corrosion and securely connected.
C. Disconnect the TCBV from the wiring harness.
D. Turn the keyswitch to the ON position.
E. Verify that there is +5 VDC between the SUPPLY (terminal 1) and RETURN (terminal 2) on the TCBV