5034381 JOHNSON *CAP, OIL PRESSURE SWITCH

Illustration 1 g01192761
Typical circuit
Illustration 2 g01193822
P1 ECM connector (P1-48) +Battery (P1-52) +Battery (P1-53) +Battery (P1-57) +Battery (P1-61) −Battery (P1-63) −Battery (P1-65) −Battery (P1-70) Keyswitch
Illustration 3 g01193823
C37 connector (Terminal 40) Keyswitch
Illustration 4 g01193824
J30/P30 connector (Terminal 8) Keyswitch (Terminal 9) +BatteryTest Step 1. Inspect Electrical Connectors and Wiring
Remove electrical power to the ECM.
Thoroughly inspect the ECM connector J1/P1. Inspect all of the other connectors. Refer to the diagnostic functional test 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 allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
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, and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.STOPTest Step 2. Check the Battery Voltage
Measure the open circuit voltage at the battery terminals.
Load test the batteries. Use the 4C-4911 Battery Load Tester. Refer to the Operating Manual, SEHS9249. Refer to Special Instruction, SEHS7633.Expected Result:The open circuit voltage at the batteries is at least 24 1 VDC, and the batteries pass the load test.Results:
OK - The no-load voltage at the batteries is at least 24 1 VDC, and the batteries pass the load test. Proceed to Test Step 3.
Not OK - The battery voltage is incorrect and/or the battery fails the load test.Repair: The batteries or the alternator are causing the problem. Recharge the batteries or replace the batteries. Verify that the original condition is resolved.STOPTest Step 3. Check the Voltage to the ECM
Remove ECM connector J1/P1.
Turn the ECS to the STOP position.
Measure the voltage between P1-48 and P1-61.
Measure the voltage between P1-52 and P1-63.
Measure the voltage between P1-53 and P1-65.
Measure the voltage between P1-70 and P1-65.
Turn the ECS to the OFF position.
Reconnect ECM connector J1/P1.Expected Result:The voltage is 24 3 VDC.Results:
OK - The voltage is 24 3 VDC. The ECM is receiving the correct voltage.Repair: If an intermittent condition is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - ECM Keyswitch - The voltage is not 24 3 VDC. Proceed to Test Step 4.
Not OK - The voltage is not 24 3 VDC at the +Battery terminals on ECM connector P1. Proceed to Test Step 5.Test Step 4. Check the Voltage to the Input for the Keyswitch of the ECM
Turn the ECS to the STOP position.
Check the voltage between engine ground and the following test points. If voltage is not present at a test point, the problem is in the device, in the wire or in the connector that precedes the point in the circuit. Refer to Illustration 1 as a reference.
Table 1
Device     Terminal    
D1 diode     Either side    
"Dead Crank Switch"     Terminals for normal crank    
J30/P30 connector     9    
A7 resistor assembly     11    
A7 resistor assembly     12    
Generator Set Control (GSC)     RM2    
ECS     6    
ECS     10    
GSC     RM1    
GSC     RM39    
TB-4     17-22    
C37 connector     40    
Turn the ECS to the OFF position.Expected Result:The voltage is 24 3 VDC at all test points.Results:
OK - The voltage is 24 3 VDC at all test points.Repair: Repair the wire 800KEY001-P19-T between ECM connector P1-70 and connector C37.STOP
Not OK - The voltage is not 24 3 VDC at a test point.Repair: Repair the device, connectors and/or wiring.STOPTest Step 5. Check the Voltage to the +Battery Inputs of the ECM
Turn the ECS to the STOP position.
Check the voltage between engine ground and the following test points. If voltage is not present at a test point, the problem is in the device, in the wire or in the connector that precedes the point in the circuit. Refer to Illustration 1 as a reference.
Table 2
Device     Terminal    
J30/P30 connector     8    
Slave relay     85    
CB4 circuit breaker     1    
CB4 circuit breaker     2    
Slave relay     30    
Slave relay     87