The diagnostic equipment signals the following error: "C0020 - Pump motor"
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This error is signalled if the control unit detects and open circuit or short circuit (positive or earth) for the motor or the feedback, if the motor relay is broken, if the pump is stuck or if the operating circuit or the reading circuit is damaged. |
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Test results |
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1 |
ELECTRICAL CONNECTION CHECK |
All OK |
Problems encountered |
Operation |
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Check that the control unit connector is not faulty at the pins (on both the wiring side and the control unit side) by carrying out a visual inspection. In particular, check that: - they are not oxidized - they are not distorted or broken - check that there is no water penetration Check the pump wiring - that there is no open circuit, short circuit to Vb - no short circuits to earth Check the state of the power fuse in the engine compartment junction unit |
Go to Step 2 |
1. Pump side connector faulty 2. Wiring side connector faulty 3. Wiring faulty 4. Fuse broken. |
1. Replace the ABS control unit assembly Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R. 2. Replace the ABS wiring. 3. Replace the ABS control unit assembly Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R. 4. Replace the fuse and find out what caused the malfunction and eliminate it. |
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2 |
CORRECT OPERATION CHECK |
All OK |
Problems encountered |
Operation |
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Delete the errors using the Examiner diagnostic equipment. Turn the key OFF and then ON to ensure that the control unit checks whether the errors are still present. Check that the fault is no longer present. |
End of diagnosis. |
The fault persists |
Replace the ABS control unit assembly Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R. |
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