20-440 Testing coolant level indicator
Model 202
Wiring diagram of engine oil level indicator, coolant level indicator, windscreen washer level indicator
(see Wiring Diagrams Volume 1, Model 202, Group 54 for further information).
A1e22 | ASR warning lamp |
A1e24 | ASD warning lamp |
A1e25 | ASD function lamp |
A1e27 | ADS warning lamp, suspension |
S41 | Coolant level indicator lamp switch |
S42 | Windscreen washer level indicator lamp switch |
S43 | Oil level indicator lamp switch |
W16/3 | Ground, left of component compartment, |
W16/4 | Ground, right of component compartment, |
X26 | Plug connection interior/engine |
X26/25 | Plug connection, engine/body (24-pin) |
A1 | Instrument cluster |
A1e3 | High beam indicator lamp |
A1e5 | Alternator charge/indicator warning lamp |
A1e7 | Brake fluid/Parking brake warning lamp |
A1e12 | Oil level warning lamp |
A1e13 | Windscreen washer level indicator lamp |
A1e14 | Exterior bulb failure warning lamp |
A1e15 | Airbag SRS indicator/warning lamp |
A1e16 | Preglow indicator lamp |
A1e17 | ABS warning lamp |
A1e21 | ASR function lamp |
Test data
Resistance at coolant level sensor with "max" coolant level | W |
Resistance at coolant level sensor with "min" coolant level | approx. 15 W |
Battery voltage | approx. 12 V |
Commercial tool
Multimeter | e. g. SUN, |
Complaints
A. Indicator lamp remains on when engine running and coolant level correct.
B. Indicator lamp does not light up when key in position "2".
C. Indicator lamp does not light up when engine running and coolant level below "min".
Testing
-------------------------------
A. Indicator lamp remains on when engine running and coolant level correct.
Test coolant level sensor. Detach connector. Connect both pins to multimeter and test resistance.
Readout: W
Yes
No
Renew coolant level sensor.
Check cable. Remove instrument cluster. Test
contact 12 of 15-pin connector to ground with
multimeter.
Readout: W
Yes
No
Rectify short to ground.
Renew gauge.
End of test
B. Indicator lamp does not light up when key in position "2".
Check operation of bulb.
Yes
No
Renew bulb.
Rectify open circuit according to wiring diagram.
Renew gauge.
End of test
Remove instrument cluster. Measure voltage at contacts 6 and 9 of 15-pin connector with multimeter.
Readout: approx. 12 V
Yes
No
C. Indicator lamp does not light up when engine running and coolant level below "min". Control function section "B" in order.
Check coolant level sensor. Detach connector. Connect both pins to multimeter and test resistance.
Readout: approx. 5 W
Yes
No
Renew coolant level sensor.
Check cable. Connect multimeter to 2-pin coolant level sensor connector (brown cable) and battery positive.
Readout: approx. 12 V
Yes
No
Test ground connection, correct if necessary.
Jumper coolant level sensor connector. With key in position "2", indicator lamp should light up.
Yes
No
Rectify open circuit according to wiring diagram.
End of test
Referenced documents
- ra20006010445x 0445 - Function of the electrical coolant level indicator Engines 601, 602 (except 602.98), 603
- ra2000601a440x 0440 - A. Testing coolant level indicator Engines 601, 602 (except 602.98), 603 in Model 124
- ra2000601b440x 0440 - B. Testing coolant level indicator Engine 603 in Model 126 USA 1986, 1990
- ra2000601c440x 0440 - C. Testing coolant level indicator Engine 603 in Model 140
- ra2000601d440x 0440 - D. Testing coolant level indicator Engines 601, 602 (except 602.98) in Model 201