841762 Volvo.Penta Alternator

The following conditions must exist before any of the preceding codes will become active:
The ECM has been powered for at least 2 seconds.
There are no active 168 codes.
There are no active 3509 codes.Use this procedure to troubleshoot the position sensors for the following valves:
NRS valve
Intake throttle valveEach position sensor is integral in the associated valve. If the following procedure indicates a fault with the position sensor, then the entire valve must be replaced.The following background information is related to this procedure:The troubleshooting procedures for the diagnostic codes of each position sensor are identical. The 5 VDC sensor supply provides power to all 5 VDC sensors. The ECM supplies 5.0 VDC to terminal "2" of the NRS valve connector and terminal "5" of the intake throttle valve connector. The sensor common from the ECM connector goes to terminal "3" of both valve connectors. The signal voltage from terminal "4" of NRS valve is supplied to P2:33. The signal voltage from terminal "6" of intake throttle valve is supplied to P2:63.
Illustration 1 g03838947
Schematic diagram for the valve position sensors
Illustration 2 g03833072
Connector on the NRS valve
(1) Motor -
(2) + 5 VDC
(3) Ground
(4) Position signal
(5) Motor +
Illustration 3 g03833076
Connector on the intake throttle valve
(1) Motor -
(2) Motor +
(3) Ground
(4) Not used
(5) + 5 VDC
(6) Position signal
Illustration 4 g03838959
Engine interface connector
(5) Sensor ground
(12) NRS valve +5 VDC
(14) Intake throttle valve +5 VDC
(18) NRS valve position signal
(31) Intake throttle valve position signal
Table 2
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 valve position 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 ground connection on the ECM for abrasions and pinch points.
E. Check the harness for abrasion and pinch points from the suspect sensor to the ECM.
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 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.
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. Wait at least 10 seconds for activation of the diagnostic codes.
D. Use the electronic service tool to monitor active diagnostic codes or recently logged diagnostic codes.
E. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: A 27-X diagnostic code is active or recently logged.
Proceed to Test Step 3.
Result: A 51-X diagnostic code is active or recently logged.
Proceed to Test Step 6.
3. Measure the Supply Voltage at the NRS Valve Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the NRS valve from the harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage between terminals 2 and 3 at the connector for the valve.
E. Reconnect the valve to the harness.
4.8 to 5.2 VDC
Result: The sensor supply voltage is out of the nominal range. The fault is in the engine harness between the valve connector and the ECM.
Repair: Repair the faulty valve connector or replace the faulty harness.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The sensor supply voltage is correct.
Proceed to Test Step 4.
4. Check the Wiring for the NRS Valve for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector from the NRS valve.
C. Disconnect the engin