941752 Volvo.Penta Fitting nut

Illustration 1 g01625535
Schematic for the set speed switches with a 31 pin MIC
Illustration 2 g01625537
Schematic for the set speed switches with a 70 pin MIC
Illustration 3 g01625538
Pin locations on the ECM connector
(11) Resume/Accelerate Switch
(19) Speed No.1 or Speed No.2 Switch
(20) Set/Decelerate Switch
(28) On/Off Switch
(29) Clutch/Brake Automatic Disengage Switch
(37) Switch Return
Illustration 4 g01625540
Pin locations on the 31 pin MIC
(21) On/Off Switch
(22) Speed No.1 or Speed No.2 Switch
(24) Resume/Accelerate Switch
(25) Set/Decelerate Switch
(26) Switch Return
(29) Clutch/Brake Automatic Disengage Switch
Illustration 5 g01332024
Pin locations on the 70 pin MIC
(11) Resume/Accelerate Switch
(19) Speed No.1 or Speed No.2 Switch
(20) Set/Decelerate Switch
(28) On/Off Switch
(29) Clutch/Brake Automatic Disengage Switch
(37) Switch Return Test Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect ECM connector J1/P1, Machine Interface Connector (MIC) J20/P20, and the battery connections. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for corrosion, abrasion, and pinch points from the throttle switch to the ECM. Expected Result:All connectors, pins, and sockets should be completely inserted and coupled. The harness and wiring should be free of corrosion, abrasion, and pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the circuit.Verify that the repair eliminates the fault.STOPTest Step 2. Check "Set Speed Switch" on the Electronic Service Tool
Turn the keyswitch to the OFF position.
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.
Observe the status of the set speed switch on the electronic service tool while you operate the set speed switch from the speed 1 position to the speed 2 position.
Observe the status of the set speed switch on the electronic service tool while you operate the set speed switch from the ON position to the OFF position.
Observe the status of the set speed switch while you operate the set speed/decelerate switch from the OFF position to the ON position.
Observe the status of the set speed control resume or accelerate switch while you operate the switch from the OFF position to the ON position. Expected Result:Result 1 the electronic service tool should show that the speed 1 status is selected with the set speed switch in the OFF position.The electronic service tool should show that the speed 2 status is selected with the set speed switch in the ON position.Note: If the engine application has two engine speed controls, ensure that speed 1 is selected.Result 2 The electronic service tool should show that the set speed control switch is in the "OPEN" condition when the set speed control switch is in the OFF position.The electronic service tool should show that the set speed switch is in the "CLOSED" position when the set speed switch is in the ON position.Note: The set speed control lamp should be OFF when the set speed control switch is in the OFF position. The set speed control lamp should be flashing when the set speed control switch is in the ON position.Result 3 When the set speed switch is in the OFF position, the set speed/decelerate switch should be in the OPEN position.When the set speed/decelerate switch is in the ON position, the set speed/decelerate switch should be in the CLOSED position.Result 4 When the set speed control resume or accelerate switch is in the OFF position, the display screen should show an OPEN condition. When the set speed control resume or accelerate switch is in the ON position, the display screen should show a CLOSED condition.Note: The set speed control lamp 1 should change from flashing to ON when the set speed resume or accelerate switch is CLOSED.Results:
OK - The set speed control switches operate correctly.STOP
Not OK - Proceed to Test Step 3.Test Step 3. Check the Status of the Automatic Set Speed Disengage Switch
Disconnect the P1/J1 ECM connector.
Insert a 70 pin Breakout T between P1 and J1.
Measure the voltage between the following pin locations:
P1:29
P1:37
Use the electronic service tool to observe the voltage while the Automatic Set Speed Disengage Switch is operated OFF and ON. Expected Result:The electronic service tool will show that the status of the automatic set speed disengage switch is in the "ENGAGED" position. The voltage should be between 0 Volts and 0.8 Volts.The electronic service tool will show that the status of the automatic set speed disengage switch is in the "DISENGAGED" position. The voltage should be between 12.3 Volts and 12.9 Volts.Results:
OK - The set speed disengage switch operates correctly.STOP
Not OK - Proceed to Test Step 4.Test Step 4. Check the Speed Control Switch
Turn the keyswitch to the OFF position.
Remove the two wires from the set speed control switch. Use a suitable jumper in order to join the two wires together.
Turn the keyswitch to the ON position.
Monitor the status screen on the electronic service tool. Slowly connect and disconnect the jumper from the connector for the switch. Expected Result:When the jumper wire is connected the status of the set speed switch should be "CLOSED".When the jumper wire is disconnected the status of the set speed switch should be "OPEN".Results:
OK - The switch is faulty.Repair: Replace the suspect switch. Refer to the documentation for the application.Use the electronic service tool to clear all logged diagnostic codes.Verify that the repair has eliminated the fault.STOP
Not OK - There is a fault in the wiring harness between the set speed control switch and the engine ECM. Proceed to Test Step 5.Test Step 5.