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SERVICE GP 4Z7057 - Caterpillar

4Z7057 SERVICE GP Caterpillar parts SERVICE
Alternative (cross code) number:
Caterpillar 4Z7057 SERVICE GP

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The following conditions must exist before any of the preceding codes will become active:
The ECM has been powered for at least 60 seconds.
There are no active 168 codes.The following background information is related to this procedure:The soot sensor is powered from the switched battery voltage. A signal is sent by the soot sensor to one soot antenna. The signal that is received by the other antenna is sent back to the soot sensor. The signal is attenuated by the soot in the Diesel Particulate Filter (DPF). The soot sensor calculates the soot load in the DPF by measuring the attenuation of the signal.
Illustration 1 g03812262
Schematic diagram for the soot sensor circuit
Illustration 2 g03812265
View of the pin locations on the P1 connector for the soot sensor
(17) CAN C +
(18) CAN C - Complete the procedure in the order in which the steps are listed.
Table 3
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Inspect the connectors for the speed/timing sensors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 45 N (10 lb) pull test on each of the wires in the suspect sensor connector and the sensor connections at the ECM.
D. Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
E. Check the ground connection on the ECM for abrasions and pinch points.
F. Check the harness for abrasion and pinch points from the suspect sensor to the ECM.
G. Check that the suspect sensor is installed correctly. Check that the suspect sensor is fully seated into the engine.
Loose connection or damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wiring harness. Ensure that all of the seals are properly in place and ensure that the connectors are correctly coupled.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points.
Repair: There may be an intermittent fault. Use the electronic service tool to perform a Wiggle Test. If no fault is identified
If no fault is identified, proceed to Test Step 2.
2. Check For Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position. Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
D. Use the electronic service tool in order to monitor active diagnostic codes or recently logged diagnostic codes. Look for an active or logged code.
E. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: Diagnostic code 4783-3 or 3397-3 is active.
Proceed to Test Step 3.
Result: Diagnostic code 4783-4 or 3397-4 is active.
Proceed to Test Step 4.
Result: Diagnostic code 4783-12 or 3397-12 is active.
Proceed to Test Step 5.
Result: Diagnostic code 4783-21 or 3397-21 is active.
Proceed to Test Step 6.
3. Check for a High Voltage at

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