MBE 900 4000 Troubleshooting – Section 12.2 Troubleshooting PID 111

Section 12.2
Troubleshooting PID 111

The ECL sensor is installed in the radiator top tank or in a remote-mounted surge tank and is connected to the VIH-VCU 15-pin connector. See Figure "Engine Coolant Level Sensor Mounted in Radiator Top Tank" for typical top tank location. See Figure "Engine Coolant Level Sensor Installation" for typical sensor installation. See Figure "Location of DDEC-VCU and Wiring Harness Connectors" for the typical location of the VIH-VCU inside the tractor cab.‪

Figure 1. Engine Coolant Level Sensor Mounted in Radiator Top Tank

Figure 2. Engine Coolant Level Sensor Installation

1. Passenger-Side Dash‪	4. 18-Pin Connector‪
2. DDEC-VCU‪	5. 21-Pin Connector‪
3. 15-Pin Connector‪	‪

Figure 3. Location of DDEC-VCU and Wiring Harness Connectors

Section 12.2.1
111 01 – Engine Coolant Level Low

Perform the following steps to troubleshoot a coolant level low fault:‪

1. Check fault code display.
   1. If fault 111 03 is active in addition to fault 111 01, refer to "12.2.2 111 03 – Engine Coolant Level Sensor Open Circuit" .
   2. If fault 111 04 is active in addition to fault 111 01, refer to "12.2.3 111 04 – Engine Coolant Level Sensor Short to Ground" .
   3. If the coolant level in the reservoir is not within limit, refer to "12.2.1.1 Required Action" .
   4. If the coolant level in the reservoir is within limit, refer to "12.2.1.2 Required Action" .

Section 12.2.1.1
Required Action

Perform the following steps to resolve a coolant level low fault. Repair as required.‪

1. Check for coolant leak at cylinder head gasket.
2. Check for coolant leak at air compressor head gasket.
3. Check for external coolant leak at hose connections.
4. Check for coolant in oil.
5. Check for loose or faulty radiator cap.

Section 12.2.1.2
Required Action

Perform the following step to resolve a coolant level low fault.‪

1. If the Switch/Indicator Datalink Monitor Template does not indicate that the coolant level is full, replace the ECL sensor.
2. Erase fault code memory.

Section 12.2.2
111 03 – Engine Coolant Level Sensor Open Circuit

Perform the following steps to troubleshoot an ECL sensor open circuit fault:‪

1. Check the voltage between the DDEC-VCU 15-pin connector wires 440 (440G on Acterra) and 440L on the ECL sensor. See Figure "Engine Coolant Level Sensor Connector Wire Locations – 440L Engine" for 440L engine sensor wiring and see Figure "Engine Coolant Level Sensor Connector Wire Locations – Acterra Engine" for Acterra engine sensor wiring.
   

   1. ECL Sensor‪	3. 15-Pin Connector‪
   2. Engine Bulkhead Connector‪	4. Ground Splice Pack No. 2‪

   Figure 4. Engine Coolant Level Sensor Connector Wire Locations – 440L Engine

   

   1. ECL Sensor‪	4. Ground Splice Pack No. 1‪
   2. Engine Bulkhead Connector‪	‪
   3. 15-Pin Connector‪	‪

   Figure 5. Engine Coolant Level Sensor Connector Wire Locations – Acterra Engine

   1. If voltage is about 5 volts, replace ECL sensor. Erase fault code memory.
   2. If voltage is the same as battery voltage, repair short to wire in ECL sensor wire 440L. Erase fault code memory.
   3. If voltage is 0 volts, go to step 2 .
2. Bridge wire 440L to battery ground.
   1. If fault 111 03 is active, repair open circuit in ECL sensor wire 440L. Erase fault code memory.
   2. If fault 111 04 is active, repair open circuit in ECL sensor wire 440 (440G on Acterra). Erase fault code memory.

Section 12.2.3
111 04 – Engine Coolant Level Sensor Short to Ground

Perform the following steps to troubleshoot an ECL sensor short to ground fault:‪

1. Disconnect the ECL sensor.
   1. If fault 111 04 is not active after disconnecting the sensor, replace the ECL sensor.
   2. If fault 111 04 is active after disconnecting the sensor, go to step 2 .
2. Disconnect the 15-pin connector.
   1. If fault 111 04 is active after disconnecting the connector, replace the DDEC-VCU. Erase fault code memory.
   2. If fault 111 04 is not active after disconnecting the 15-pin connector, repair short to ground in ECL sensor wire 440L. Erase fault code memory.