General Note: The trip computer control module (N41) has the following functions: Calculate and display momentary and average fuel consumption Calculate and display estimated range Display time Display date ATA monitoring with glass break sensor ATA monitoring with incline sensor Trip computer control module (N41) receives all the information via CAN data bus (Figure 1 11 )

Test step/Test scope	Test condition	Nominal value	Possible cause/Remedy 1)
Trip computer control module (N41) Display, Voltage supply	Ignition: On switch (S2) in position 1 circuit 15R	All functions of trip computer will be activated in display for about 1 sec. (Figure 1 21 )	If no function is activated: Voltage supply 23 1 If only some functions are not activated: Trip computer control module (N41)
Trip computer control module (N41) Fuel consumption signal	Engine: On at idle Momentary fuel consumption mode on the trip computer display. Speedometer display in the instrument cluster (A1) operational Engine: On Momentary fuel consumption mode. Speedometer operational. Vehicle coasting with engine speed of approx. 2000 rpm	Trip computer displays maximum fuel consumption value (0.0 mil/gal; 99l/km) Trip computer displays minimum fuel consumption value (70 mil/gal; 0.0 l/km) The values correspond to the time of supplement edition (August 97) and they may change	Engine control module (N3/10) Trip computer control module (N41)

1) Observe Preparation for Test, see 22 .