Group 30 electrical system5(0)Content08-2 Special organization Tools30-0 GeneralDesign and also Function30-2 error TracingGeneralFault CodesMeasurements39-0 GeneralIndexReferences to service Bulletins

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MID 128, PID 111 Coolant level‌

FMI 1 – Data precious but above normal operational range

Fault code explanation:

Coolant level is as well low.

You are watching: Mid 128 pid 111 fmi 1

Fault indication:

DCU: Engine warning in DCU display. CIU: speed code

Flash code

Electrical fault: 2.3

Value fault: 2.2


Engine is derated if the engine defense parameter is activated.

Suitable action:

1 examine the coolant level.

2 Bleed the coolant water system.

3 If short coolant level inspect the coolant water system for leakage by a pressure test.

4 check the push valve in the coolant cup.

5 examine the wiring to the coolant level switch.

6 examine the coolant level switch.

FMI 3– Voltage over normal or shorted high

Fault code explanation:

Faulty switch / Faulty move circuit

Fault indication:

DCU: Engine warning in DCU display. CIU: flash code

Flash code

Electrical fault: 2.3

Value fault: 2.2

Conditions for fault code:

The voltage on pin B23 in the engine regulate unit is too high.

Possible reason:

Short circuit to battery voltage on pen B23.

Suitable action:

1 examine the cable harness between the coolant level switch and also the EMS2.








B 2




Circuit description

The coolant level in the engine is monitored by a level switch. Pen 23 top top the engine manage unit (EMS2) pro- vides pen 1 top top the level switch with supply voltage. Pen 2 on the level switch is connected to battery negative via pin 10 top top the engine regulate unit. The level switch has actually two states: On/Off.

See more: Adjusting Entries Are Designed Primarily To Correct Accounting Errors.

The level switch consists of two sections, the actual switch and also a magnetic float i m sorry is developed into the


a Connector B b Coolant level

expansion tank. The switch senses the position of the

magnetic float. Once the coolant level falls, the float operates the switch and also a close up door circuit is formed.


Checking it is provided cable, coolant level switch page 158

Checking negative cable, coolant level switch web page 158

Checking coolant level switch web page 158

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