0321376 EVINRUDE WASHER

Table 1
CDL Code and Description Conditions which Activate the Code System Response
E563(3) Low Engine Coolant Flow The coolant flow switch indicates that coolant flow has stopped. The coolant flow switch is in the open position. The code is logged.
1937-2 Engine Coolant Flow Switch erratic, intermittent, or incorrect The coolant flow switch indicates that coolant flow is intermittent. The coolant flow switch is a paddle switch that is used to detect the flow of coolant in the engine cooling system.
Illustration 1 g01249790
Coolant flow switch
(1) Flow switch assembly
(2) Paddle The coolant flow switch is a normally open switch. The contacts of flow switch assembly (1) close as coolant flow from the engine flows across paddle (2) of the switch. The Electronic Control Module (ECM) monitors the status of the coolant flow switch during engine operation. If the ECM detects a loss of coolant flow during operation, a signal will be sent in order to alert the operator of the condition.The status of the "Engine Coolant Flow" can be monitored using Caterpillar Electronic Technician (ET) to determine the state of the coolant flow switch.
Illustration 2 g02284736Schematic for the coolant flow switch
Table 2
Troubleshooting Test Steps Values Results
1. Check the Coolant Level
A. Ensure that the coolant level for the engine is correct.
Coolant Level
Result: The coolant level is OK. Proceed to Test Step 2.
Result: The coolant level is low.
Repair: Diagnose the reason for a low coolant level.
Verify that the repair eliminates the problem.
Illustration 3 g02301274
Location of the ECM connectors
(3) J1/P1 ECM connector
Illustration 4 g02301279
Location of the coolant flow switch (right front engine view)
(4) Coolant flow switch
Illustration 5 g03336343
Terminal locations at the P1 ECM connector for the coolant flow switch
(P1-5) Return
(P1-54) Coolant flow switch
Illustration 6 g01155187
Terminal locations at the connector for the coolant flow switch
(Terminal 1) Signal
(Terminal 2) Return
Table 3
Troubleshooting Test Steps Values Results
2. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect J1/P1 ECM connector (3) and the connector for coolant flow switch (4). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
D. Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Electrical Connectors and Wiring
Result: The harness and wiring are OK. Proceed to Test Step 3.
Result: 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 coupled. Verify that the repair eliminates the problem.
STOP
3. Use Cat ET to Monitor the Switch Status
A. Connect Cat ET to the service tool connector.
B. Turn the keyswitch to the ON position.
C. Observe the status for "Engine Coolant Flow" on Cat ET.
D. Start the engine.
E. Observe the status for "Engine Coolant Flow" on Cat ET.
F. Turn the keyswitch to the OFF position.
Switch Status
Result: Cat ET indicates "No Flow" while the engine is not running. Cat ET indicates "Flow" while the engine is running.
Repair: The switch is operating correctly at this time. There may be an intermittent problem with the switch or the switch circuit. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".
Verify that the repair eliminates the problem.
Result: Cat ET does not indicate "No Flow" while the engine is not running. Cat ET does not indicate "Flow" while the engine is running. Cat ET does not indicate the correct status for the coolant flow switch.
Proceed to Test Step 4.
4. Create a Short at the Connector for the Coolant Flow Switch
A. Disconnect the connector for the coolant flow switch.
B. Fabricate a jumper wire that is long enough to create a short at the harness connector for the coolant flow switch. Crimp connector pins to each end of the jumper wire.
C. Install the jumper wire to the terminals of the harness connector of the coolant level switch.
D. Turn the keyswitch to the ON position.
E. Observe the status of "Engine Coolant Flow" on Cat ET.
F. Turn the keyswitch to the OFF position. Restore the wiring to the original configuration.
Coolant Flow Switch
Results: The status indicates "Flow" with the jumper wire in place.
Proceed to Test Step 5.
Results: The status indicates "No Flow" with the jumper wire in place