820755 Volvo.Penta Attaching plate

Table 1
Diagnostic Codes Table
Code Conditions which Generate this Code System Response
336-2 Engine Control Switch : Erratic, Intermittent, or Incorrect The inputs from the ECS are in a different state. The code is logged. The Electronic Control Module (ECM) receives two input signals from the ECS. The two input signals should have the same logic level. If two different levels of logic are detected during the powerup, the ECM will determine that one of the signals is incorrect. The duplication of the signals permits the ECM to know if there is a problem in the wiring.When both of the input signals are high or open, the ECM assumes that the ECS is in the STOP position. When both of the input signals are low or shorted to the −Battery, the ECM assumes that the ECS is in the START position. After the ECS is turned to the START position, the ECM will initiate the starting sequence. The ECM will energize the prelube system if the prelube system is available and activated. After the prelube cycle is completed, the ECM will energize the starting solenoids for the starting motors. If both of the signals go high or open while the engine is running, the injection signals to the injector solenoids will be stopped and the engine will shut down.If the engine is running and one of the inputs from the ECS changes states, the ECM will ignore the inputs from the ECS until power is cycled to the ECM. If this occurs, you must use the emergency stop switch or you must disconnect the power to the ECM in order to shut down the engine.If the inputs from the ECS are in opposite states at the beginning of a crank cycle, the ECM will not initiate the crank cycle. If this condition occurs, the engine may be started by using the manual crank switch. If you start the engine with the manual crank switch, you must use the emergency stop switch or you must disconnect the power to the ECM in order to shut down the engine. A diagnostic code will be logged and a diagnostic code will be active for this problem. The diagnostic code for this problem will be active until the ECM is powered down.
Illustration 1 g01382553
Typical schematic
Illustration 2 g01382297
P1 ECM connector
(P1-21) Start/Run/Stop switch 1
(P1-22) Start/Run/Stop switch 2
Illustration 3 g01382298
Customer connector
(Terminal 46) Start/Run/Stop switch 1
(Terminal 47) Start/Run/Stop switch 2
Illustration 4 g01234146
Location of ECM connectors
Test Step 1. Inspect Electrical Connectors and Wiring
Turn the main disconnect switch to the OFF position.
Thoroughly inspect the ECM connectors. Inspect all of the other connectors for the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Status of the ECS on Caterpillar Electronic Technician (ET)
Connect Cat ET to the service tool connector.
Turn the main disconnect switch to the ON position.
Monitor the status for the ECS on Cat ET.
Turn the ECS to the START position.
Monitor the status for the ECS on Cat ET.
Turn the ECS to the STOP position. Expected Result:The status for the ECS reads "OFF" when the ECS is turned to the STOP position. The status for the ECS reads "ON" when the ECS is turned to the START position.Results:
OK - The status for the ECS is correct in both the STOP and the START positions.Repair: The circuit for the ECS is functioning correctly. Reset the system and check for any active diagnostic codes. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The status for the switch is not correct in either the STOP or the START positions. Proceed to Test Step 3.Test Step 3. Check the Wiring for an Open Circuit
Turn the main disconnect switch to the OFF position.
Disconnect the ECM connector J1/P1.
Note the location of the wires on the ECS. Remove the wire to the −Battery from the ECS.
Check continuity between P1-21 and the wire F716-BK(Black) on the ECS.
Check continuity between P1-22 and the wire G716-BK(Black) on the ECS.
Check continuity between the wire to the −Battery on the ECS and the −Battery. Expected Result:Each resistance measurement indicated a short circuit.Results:
OK - Each resistance measurement indicated a short circuit. Proceed to Test Step 4.
Not OK - A resistance measurement did not indicate a short circuit.Repair: There is excessive resistance or an open in the wiring. Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 4. Check the Wiring for a Short Circuit
Remove the wire F716-BK(Black) and the wire G716-BK(Black) from the ECS.
Ensure that the wires from the ECS are not touching engine ground or any other wires in the harness.
Check continuity between P1-21 and every wire on the P1 connector and on the P2 connector. Measure the resistance between P1-21 and engine ground.
Check continuity between P1-22 and every wire on the P1 connector and on the P2 connector. Measure the resistance between P1-22 and engine ground. Expected Result:Each resistance measurement indicated an open circuit.Results:
OK - Each resistance measurement indicated an open circuit. Proceed to Test Step 5.
Not OK - A resistance measurement did not indicate an open circuit.Repair: The wires with the low resistance reading to ground or to each other are damaged. Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 5.