31638-ZY3-003 Honda BELT, ALTERNATOR (Honda Code 6991541). (6PK745 M-180)

Illustration 1 g06207671
C7.1 engines
(1) Manifold for the NRS pressure sensors
(2) NRS differential pressure sensor
(3) Inlet pipe for the NRS differential pressure sensor
(4) Outlet pipe for the NRS differential pressure sensor
(5) NRS cooler
(6) NRS mixer
(7) NRS inlet temperature sensor
Illustration 2 g06462552
C4.4 engines
(1) NRS Valve
(2) NRS differential pressure sensor
(3) NRS cooler
(4) NRS inlet temperature sensor
(5) NRS outlet temperature 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
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. Download Information Using the Electronic Service Tool
A. Use the electronic service tool to download the "Warranty Report" and the "Product Status Report" (PSR) with histograms before performing any troubleshooting or clearing any diagnostic codes.
Note: The downloaded information will be required by the Dealer Solutions Network (DSN) if troubleshooting assistance is required.
Downloaded information
Result: The information was successfully saved.
Proceed to Test Step 2.
Result: The electronic service tool information was not successfully saved.
Contact the Dealer Solutions Network (DSN) for guidance.
2. Create an Electronic Service Tool Snapshot
A. Select "Snapshot Viewer" on the electronic service tool, using menus: Information -> Snapshot -> Viewer
B. Select the event code and then click "View Graph".
C. Select the following parameter and then click OK.
Engine Speed
D. Select Save to "File to save" a Snapshot File (*.xml). This file will contain all the data in the snapshot and not only the data shown on the graph.
Note: The downloaded information will be required by the DSN if troubleshooting assistance is required.
Snapshot saved
Result: The electronic service tool snapshot was successfully saved.
Proceed to Test Step 3.
Result: The electronic service tool snapshot was not successfully saved.
Contact the DSN for guidance.
3. Diagnostic Codes
A. Use the electronic service tool to check for active or logged diagnostic codes.
Diagnostic codes
Result: An associate diagnostic code is active or logged.
Repair: Troubleshoot the associated diagnostic codes before continuing with this procedure. Refer to Troubleshooting, Diagnostic Trouble Codes or Troubleshooting, Event Codes for more information.
Result: A diagnostic code for the NRS valve is active or logged.
Repair: Rectify the NRS valve diagnostic code. Refer to Troubleshooting, Motorized Valve - Test.
Result: A 2659–7 (E1319 (2)) diagnostic code is active with no associated ETI code.
Proceed to Test Step 4.
Result: A 2659–7 (E1319 (2)) diagnostic code is active with an associated ETI code of 1.
Proceed to Test Step 9.
4. 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.
Repair: Install a replacement harness.
Result: The harness and connectors are OK.
Proceed to Test Step 5.
5. 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, proceed to Test Step 6.
6. Check the Sensor Pipes
Refer to Illustration 2.
A. Check inlet pipe (3) for the NRS differential pressure sensor for leaks, restrictions, or blockage.
B. Check outlet pipe (4) for the NRS differential pressure sensor for leaks or any restriction.
C. Test the exhaust back pressure regulator. Refer to Troubleshooting, "Motorized Valve - Test".
Pressure sensor and pipes
Result: There is a leak, a restriction, or a blockage