8811M Mariner PISTON (1ST O.S.-82.25 MM)

Table 1
Event Code
Code and Description Default Conditions which Generate this Code System Response
E2143(1) Low Engine Coolant Level The coolant level sensor or the SCAC level sensor sends a signal to the engines' Electronic Control Module (ECM) that indicates a low coolant level. The code is logged. Use this procedure in order to troubleshoot any suspect problems with the coolant level sensor(s) or with the wiring circuit.
Illustration 1 g01813100
Schematic for coolant level sensor
Illustration 2 g01356875
Terminal locations for the A-C1/E-C2 RH rigid harness connectors and the C-C1/E-C1 LH rigid harness connectors
(Terminal C) "8 V digital sensor supply (RH)"
(Terminal D) "Digital sensor return (RH)"
(Terminal AC) "SCAC coolant level"
(Terminal S) "Engine coolant level"
Illustration 3 g01337991
Connector locations
(1) A-C1/E-C2 RH rigid harness connectors
(2) A-C2/J-C2 RH rigid harness connectors
(3) P-C1/A-C90 Connectors for the power distribution panel
(4) P-C2/A-C91 Connectors for the power distribution panel
(5) G-C6/F-C2/F-C1/A-C92 Connectors for a RH Control panel
(6) C-C22 Connection for the P2 ECM connector
(7) C-C15 Connection for the P1 ECM connector
(8) G-C6/F-C2/F-C1/C-C17 Connectors for a LH Control panel
(9) C-C18/TB-C1 Customer connectors
(10) C-C2/J-C1 LH rigid harness connectors
(11) C-C1/E-C1 LH rigid harness connectors
Illustration 4 g01356932
Terminal locations for the A-C48 connector for the coolant level sensors
(Terminal A) "8 V digital sensor supply (RH)"
(Terminal B) "Digital sensor return (RH)"
(Terminal C) "Engine coolant level"
(Terminal D) "SCAC coolant level"
Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Thoroughly inspect the connector for the coolant level sensor(s) and the A-C48 connector. Inspect the ECM connector J1/P1 and the ECM connector J2/P2. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 5 g01814037
ECM connectors
(P1-15) SCAC coolant level sensor
(P1-30) Engine coolant level sensor
(P1-4) +8 V digital supply
(P1-5) Digital sensor return
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the coolant level sensor(s).
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and 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 with the connectors and/or the wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Supply Voltage at the Sensor Connector
Disconnect the coolant level sensor.
Restore electrical power to the ECM.
Illustration 6 g01356605
Harness connector for the coolant level sensor
(A) +8 VDC
(B) Return
(C) Signal
Measure the voltage between terminals A (+8 VDC) and B (return) at the harness connector for the coolant level sensor.
Remove electrical power from the ECM. Expected Result:The voltage measurement is 8.0 0.4 VDC.Results:
OK - The voltage measurement is 8.0 0.4 VDC. The supply voltage is reaching the sensor. Proceed to Test Step 3.
Not OK - The voltage measurement is not 8.0 0.4 VDC. The digital sensor supply voltage is not reaching the sensor. Proceed to Test Step 8.Test Step 3. Disconnect the Coolant Level Sensor and Monitor the Status of "Coolant Level"
Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Disconnect the connector for the coolant level sensor.
Restore electrical power to the ECM.
Monitor the status of "Coolant Level" on Cat ET. Expected Result:The status changes from "OK" to "Low" when the sensor is disconnected.Results:
OK - The status is "Low" when the sensor is disconnected. Proceed to Test Step 4.
Not OK - The status is "OK" when the sensor is disconnected. Proceed to Test Step 5.Test Step 4. Short the Harness and Monitor the Status of "Coolant Level"
Install a jumper wire between terminals B (return) and C (signal) on the harness connector for the coolant level sensor.
Monitor the status of "Coolant Level" on Cat ET while the jumper wire is installed.
Remove the jumper wire.
Remove electrical power from the ECM. Expected Result:The status changes from "Low" to "OK" when the jumper wire is installed.Results:
OK - The status changes from "Low" to "OK" when the jumper wire is installed. The ECM and the wiring to the coolant level sensor are OK.Repair: