Drive Cycle

To enable the AMFR adaption and/or FMFR adaption to reset, the following preconditions must first be obtained:

^ Air intake temperature must be between, 10 deg C and 55 deg C.

^ Engine coolant temperature must be between, 80 deg C and 100 deg C. Illustration 1 shows a view of the PDU screen in bar chart form with the relevant conditions and typical values for an engine in good fuelling order.

Note:
Where values are less than 1 kg/hr, the PDU display will show the values as g/hr, for example, 500 g/hr rather than 0.5 Kg/hr. (Illustration 1).

Air Mass Flow Rate (AMFR) adaption

The AMFR adaption value should be no lower than -4.2 kg/hr and no greater than +2.8 kg/hr for both normally aspirated and super charged engines.

Note:
Where values are less than 1 kg/hr, the PDU display will show the values as g/hr, for example 500 g/hr rather than 0.5 Kg/ hr. (Illustration 1).

Allow the vehicle to idle until the AMFR adaption value changes and then stabilizes; if the adaption is within the above values then the previous flow chart repair has been successful. If the adaption is still outside of the above values then continue to follow the flow chart until the fault is found.

After the completion of each flow chart repair, dump the trace snapshot into the trace buffer; which can then be printed out and be used for Warranty Audit Purposes.

Fuel Mass Flow Rate (FMFR) adaption

Note:
For accurate results the FMFR adaption must be performed immediately after AMFR adaption; do not switch engine off, or disconnect the PDU.

The FMFR adaption should be between +700 g/hr and -700 g/hr for normally aspirated engines, and between +1.4 kg/hr and -1.4 kg/hr for super charged engines.

Note:
Where values are less than 1kg/hr, the PDU display will show the values as g/hour, for example 500 g/hr rather than 0.5 Kg/hr. (Illustration 1).

Drive the vehicle at a steady speed, between the RPM and the engine load values for the model year stated below, until the FMFR adaption value changes and then stabilizes. Obtain the correct engine load and RPM balance by driving on a highway with 3rd gear (manual) selected at the stated RPM, while applying slight pressure to the foot-brake to maintain engine load.

Warning:
For safety reasons the FMFR adaption process must be performed by two persons: Driver, and Passenger - to monitor the PDU and advise the driver of when the engine is being driven between the RPM and engine load values stated.

1995 MY: engine speed 1500 to 3000 RPM; engine load 273% to 40%.
1996 MY: engine speed 2000 to 3000 RPM; engine load 23.4% to 40%.
1997 MY: engine speed 1850 to 3000 RPM; engine load 172% to 40%.

When performing the FMFR adaption drive cycle, the stated RPM and engine load values must be adhered to, otherwise the adaption will stabilize at the incorrect value.

When the FMFR adaption value has changed and stabilized, and the adaption is within the above stated adaption values, then the previous flow chart repair has been successful. If the adaption is still outside of these values then continue to follow the flow chart until the fault is found.

After the completion of each flow chart repair, dump the trace snapshot into the trace buffer, which can then be printed out and be used for Warranty Audit Purposes.