LOCK 1G4378 - Caterpillar

Illustration 1 g06155815
(1) NRS inlet temperature sensor
(2) NRS mixer
(3) Pipe for the NRS differential pressure sensor
(4) Pipe for the NRS inlet pressure sensor
(5) Manifold for the NRS pressure sensors
(6) NRS cooler
(7) NRS differential pressure sensor
(8) NRS inlet pressure sensor
Table 2
Associated Codes
J1939 Code CDL Code
412-15 E1092 (1)
412-16 E1092 (2) Probable Causes
Diagnostic codes
Electrical connectors and harness
Air inlet and exhaust system
NRS inlet pressure sensor and sensor pipes
NRS temperature sensor
NRS mixer
NRS coolerRecommended Actions
Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 3
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Download the Warranty Report and the Product Status Report with Histograms before performing any troubleshooting or clearing any diagnostic codes.
Note: The downloaded information will be required by the Technical Communicator if troubleshooting assistance is needed.
B. Use the electronic service tool to check for active or logged codes.
Diagnostic codes
Result: An associated code is active or logged.
Repair: Troubleshoot associated codes before continuing with this procedure. Refer to Troubleshooting, Event Codes for further information.
Result: A diagnostic code for the NRS valve is active or logged.
Repair: Rectify the NRS valve code. Refer to Troubleshooting, "Motorized Valve - Test".
Result: A 2659-7 (E1319 (2)) code is active with no ETI code active.
Proceed to Test Step 2.
Result: A 2659-7 (E1319 (2)) code is active with an ETI code of 1 active.
Proceed to Test Step 7.
2. Inspect the Electrical Connectors and the Harness
A. Turn the keyswitch to the OFF position.
B. Inspect the connectors for the components in the NRS system. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 45 N (10 lb) pull test on each of the wires in any suspect connector and the connections at the ECM.
D. Check that the ground connection on the ECM and the negative terminal on the battery are correctly installed.
E. Check the ground connection on the ECM for abrasions and pinch points.
F. Check the screws for the ECM connector for the correct torque of 6 N m (53 lb in).
G. Check the harness for abrasion and pinch points from the NRS components to the ECM.
H. Check that any suspect connector is installed correctly.
Connectors and harness
Result: An electrical connector or a cable is not correctly installed.
Repair: Install the connector or cable correctly.
Result: The harness is faulty.
Install a replacement harness.
Result: The harness and connectors are OK.
Proceed to Test Step 3.
3. Check the Air Inlet and Exhaust System
A. Check the air inlet system for leaks and for restrictions.
B. Check the exhaust system for leaks and for restrictions.
C. Test the exhaust back pressure regulator. Refer to Troubleshooting, "Motorized Valve - Test".
Air inlet and exhaust system
Result: The air inlet system has a leak or is restricted.
Repair: Clear any restrictions in the air inlet system.
Repair any air leaks in the air inlet system.
Result: The exhaust system has a leak or is restricted.
Repair: Clear any restrictions in the exhaust system.
Repair any air leaks in the exhaust system.
If the fault is still present,