7745750_060 Volvo.Penta Fan hub

Table 1
Diagnostic Trouble Codes for the Ground Level Shutdown Switch
J1939 Code Code Description Comments
970-7 Engine Auxiliary Engine Shutdown Switch : Not Responding Properly The Electronic Control Module (ECM) detects the following condition:
The shutdown switch is not responding as expected. The ground level shutdown switch allows the engine to be stopped from ground level. When the switch is moved to the STOP position, the engine shuts down. The ECM remains powered. The ground level shutdown switch must be in the RUN position and the power to the ECM must be cycled before the engine can restart.
Illustration 1 g06015498
Schematic for the ground level shutdown switch
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P2 ECM connector and the switch connector.
Refer to Troubleshooting, "Electrical Connector - Inspect".
B. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the ground level shutdown switch connector.
C. Check the harness for corrosion, abrasion, and pinch points from the solenoids 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 Code
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Place the ground level shutdown switch in the RUN position.
D. Turn the keyswitch to the ON position. Wait at least 20 seconds for activation of the diagnostic codes.
E. Verify if diagnostic code 970-7 is active.
F. Turn the keyswitch to the OFF position.
Diagnostic codes
Result: No diagnostic codes are active or logged.
Repair: The switch is operating normally. There may be an intermittent fault in the wiring harness or in a connector. Check the wiring harness and the connectors for an intermittent electrical fault. Refer to Troubleshooting, "Electrical Connector - Inspect".
Result: A 970-7 diagnostic code is active.
Proceed to Test Step 3.
3. Create a Short Circuit at the Shutdown Switch Connector
A. Turn the keyswitch to the OFF position.
B. Fabricate a jumper wire. Install the jumper wire between terminal 1 and terminal 2 on the harness connector for the shutdown switch.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to check for an active 970-7 diagnostic code.
E. Turn the keyswitch to the OFF position. Remove the jumper wire.
Diagnostic code
Result: The 970-7 diagnostic code is no longer active with the jumper installed.
Repair: Install a replacement ground level shutdown switch.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The 970-7 diagnostic code is still active with the jumper installed.
Proceed to Test Step 4.
4. Check the Wiring for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector for the ground level shutdown switch. Disconnect the P2 connector from the ECM.
C. Measure the resistance between the terminal on the shutdown switch harness connector and P2:81.
D. Turn the keyswitch to the ON position.
E. Measure the voltage between the power input terminal on the shutdown switch harness connector and ground.
F. Turn the keyswitch to the OFF position.
Less than 2.0 Ohms
Result: The measured resistance is greater than 2.0 Ohms. The fault is in the wiring between the ground level shutdown switch and the P1 ECM connector.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Result: The measured voltage is less than battery voltage.
Repair: Investigate the cause of the low battery voltage.
Result: The measured resistance and voltage are OK.
Proceed to Test Step 5.
5. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector for the ground level shutdown switch. Disconnect the P2 connector from the ECM.
C. Check the resistance between P2:81 and all other terminals on the P2 connector.
Greater than 1.0 k Ohm
Result: At least one of the resistance measurements is less than 1.0 k Ohm. There is a short in the wiring between the ground level shutdown switch and the P1 connector.
Repair: Repair the faulty wiring or replace the faulty wiring.
Result: All resistance measurements are greater than 1.0 k Ohm.
Contact the Dealer Solutions Network (DSN).