Fault Code 11
Fault Code 11Motorized In-car Aspirator
The Motorized In-car Aspirator (MIA) comprises of a small motor and a thermistor.
- Thermistor, harness or Air Conditioning Control Module (A/CCM) open circuit.
- Thermistor, harness or A/CCM short circuit to ground.
The MIA operates in the range of 0 to 5 volts and forms the main reference point for the whole system.
If the signal on pin 33 (12-way connector, A/CCM) remains at less than 1 volt, suspect either a short circuit to ground on the signal wire or an open circuit on the 5 volt supply to the thermistor. If the signal on pin 33 rises to approximately 5 volts, suspect an open circuit on the earth supply to the thermistor.
Check the voltage, against the graph below (Image), measured between pin 33 (12-way connector) and pin 19 (22-way connector) A/CCM.
Characteristics Of Motorized In-Car Aspirator, Fig.1:
If the voltage is within the set limits, the system is operating correctly.
A resistance check can be carried out at the thermistor and should conform with the figures below, measured between pin 1 and pin 2 (4-way connector).
10 °C 3.1 - 3.7 K Ohm
25 °C 1.6 - 1.8 K Ohm
50 °C 0.5 - 0.7 K Ohm
If the resistance is outside the set limits, renew the thermistor.
NOTE: The resistance should continue to decrease as the temperature increases and vice versa.
Inspect thermistor harness for open circuit or short circuit to ground. repair as necessary.
If the voltage is outside the set limits, renew the A/CCM.
The operation of the motor can be checked by applying fused ignition feed to pin 3 and a ground to pin 4, motor white, 4-way connector.