The diagnostic equipment signals the following error: "C1221 - Engine Management (NCM)"
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Error C1221 is signalled if the control unit receives invalid CAN signals from the Engine Management control unit. |
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Test results |
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1 |
CHECKS USING DIAGNOSTIC EQUIPMENT |
All OK |
Problems encountered |
Operation |
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Connect the diagnostic equipment and check that the accelerator pedal potentiometers are working properly |
Go to Step 2 |
One of the potentiometers is not operating correctly |
Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R |
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2 |
ENGINE MANAGEMENT CONTROL UNIT POWER SUPPLY CHECK |
All OK |
Problems encountered |
Operation |
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Check that the engine control unit is receiving the correct power supply |
Go to Step 3 |
Engine management control unit power supply missing |
Restore the correct connections |
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3 |
ELECTRICAL CONNECTIONS CHECK |
All OK |
Problems encountered |
Operation |
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Check that the connection between the engine management control unit and the ABS control unit is correct |
Go to Step 4 |
CAN electrical connections faulty |
Restore the correct connection. |
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4 |
CORRECT OPERATION CHECK |
All OK |
Problems encountered |
Operation |
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Delete the errors using the diagnostic equipment. Road test See Test 3350EA ESP SYSTEM INTERVENTION CHECK to ensure that the control unit checks whether there are any errors still present. Return to the workshop and check that the fault is no longer present using the diagnostic equipment. |
End of diagnosis |
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