HEXA

ENGINE

173

315.8

310.0

321.6

100

182.8

180.4

185.1

REFITMENT

1. Locate the TMAP sensor on intercooler outlet

and fit one mounting bolt.

2. Connect the electrical connection to the TMAP

sensor.

4.CIMAF SENSOR (Continental

Integrated Mass

Airflow Sensor

)

This sensor gives Information about the amount of

air quantity and temperature of the air entering in

the engine. This input is used by the ECU for cor-

rections of fuel quantity based on amount of air

availability for optimization of exhaust gas circula-

tion & the turbocharger control.

NOTE

While assembling, the AMF sensor the point of the

arrow should be towards the Turbo charger.

The operating principle is based on the heating of a

diaphragm (

sensitive

element

containing

two

re-

sistances upstream and downstream of the support

)

in a by-pass duct through which the engine intake

air flows.

Two temperature dependent metal film resistors on

thin glass substrates are mounted in the CIMAF

flow channel. The resistors are connected with fixed

resistors R1 and R2 in a bridge circuit. The bridge is

balanced so that the control electronics heat RS to

a fixed temperature differential relative to the intake

air. The sensing resistor RT compensates for intake

air temperature variations, holding the constant

temperature offset of RS. The intake airflow con-

verts heat from RS and the heating current must be

dynamically increased by the control electronics to

maintain the fixed offset temperature. The current

flowing through RS is a measure for the mass air-

flow and can be measured as a voltage drop across

the fixed resistor R2. This signal is processed by the

sensor and is output as either an analog or frequen-

cy signal.

NOTE

The flow meter measures the air mass directly (not

the volume) to eliminate problems of compensation

correlated to the temperature, altitude, pressure