21757071 Volvo.Penta Valve spring

Illustration 1 g01037608
Optional remote control panel with status control module and air/fuel ratio control (1) Desired speed potentiometer (2) "IDLE/RATED" switchThe ECM diagnoses a fault for the desired speed input only when the "IDLE/RATED" switch is in the "RATED" position. The ECM will generate a diagnostic code if the desired speed input is missing or noisy. During a fault condition, the ECM will set the desired speed according to the value of the "APPLICATION" or "Engine Operation Type" parameter.
If the parameter is set to "Industrial", the desired speed is set to 100 rpm less than the value of the "RATED SPEED" parameter.
If the parameter is set to "Generator", the desired speed is set to the value of the "RATED SPEED" parameter.Optional Configuration for Canadian Standards Association (CSA)The configuration for CSA may include a remote control panel that includes air/fuel ratio control. This panel has a Remote Speed Control (RSC).
Illustration 2 g01037616
Optional remote control panel with air/fuel ratio control (3) "LOCAL HIGH" indicator (4) Desired speed potentiometer (5) "LOCAL LOW" indicator (6) "LOCAL" indicator (7) "REMOTE/LOCAL" switch (8) "REMOTE" indicator (9) P6 connector for the remote desired speed signalThe RSC allows the operator to select a local speed signal or a remote speed signal. The speed signals must be within 2.5 percent of each other in order for the RSC to switch inputs.The RSC accepts three inputs:
A local speed signal that is provided by a 1000 Ohm potentiometer
A remote speed signal that is provided by the customer
A "REMOTE/LOCAL" switchNote: The customer's equipment must provide a 4 to 20 mA signal.During operation, the RSC illuminates these indicators:"LOCAL" - The RSC is operating in the local mode. The desired speed signal is being provided by the potentiometer."REMOTE" - The RSC is operating in the remote mode. The desired speed signal is being provided by the customer's equipment."LOCAL LOW" - The local speed is greater than 2.5 percent below the remote speed. The RSC will not switch modes."LOCAL HIGH" - The local speed is greater than 2.5 percent above the remote speed. The RSC will not switch modes.
Illustration 3 g01037242
Typical schematic for the desired speed signalIn this example, the desired speed signal is provided by potentiometers.
Illustration 4 g01037594
Schematic of the optional remote control panel for CSAThe "REMOTE/LOCAL" switch is shown in the local position.When the "REMOTE/LOCAL" switch is in the "LOCAL" position, the switch creates an open circuit for the input on the RSC. When the "REMOTE/LOCAL" switch is in the "REMOTE" position, the switch connects the input to the −Battery.Test Step 1. Inspect the Electrical Connectors and Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 5 g01037662
Internal view of the optional remote control panel with status control module and air/fuel ratio control (10) Terminal strips (11) J2/P2 connectors for the ECM (12) PWM converter (13) J4/P4 connectors for the PWM converter (14) J1/P1 connectors for the ECM
Illustration 6 g01042901
Internal view of the optional remote control panel with air/fuel ratio control (15) Remote speed control
Thoroughly inspect each of the following connectors:
J1/P1 and J2/P2 connectors on the ECM
J4/P4 connectors for the PWM converter
The connections for the potentiometer, for the pressure transducer, or for the customer's equipment
Illustration 7 g01037673
Harness side of the P2 and P1 connectors (P2-3) +20 VDC for the desired speed potentiometer (P2-6) −Battery (P2-14) +Battery (P2-15) +Battery (P1-18) Desired speed signal (PWM)
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the desired speed signal.
Check the terminal strips for corrosion and for mechanical failure.
If the engine is equipped for CSA, check the harnesses and the wiring for abrasion and for pinch points between the device that provides the desired speed signal and the remote speed control. Otherwise, check the harnesses and the wiring for abrasion and for pinch points between the device that provides the desired speed signal and the PWM converter.
If the engine is equipped for CSA, check the harnesses and the wiring for abrasion and for pinch points between the remote speed control and the ECM. Otherwise, check the harnesses and the wiring for abrasion and for pinch points between the PWM converter and the ECM.Expected Result:The connectors, pins, and sockets are connected properly. The terminal strips do not have corrosion or mechanical failure. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. If the engine is configured for CSA, proceed to Test Step 8. Otherwise, proceed to Test Step 2.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: