ECM F/A1000, Instruction Manual, Page: 11 / 26

7
1st BYTE 2nd BYTE COMMAND NO. COMMAND
XXXX 0000 XXXX 0000 0 Stay in Command Mode
XXXX 0000 XXXX 0001 1 Device Identification (See Below)
XXXX 0000 XXXX 0010 2 Not Used
…. …. …. ….
XXXX 0000 XXXX 1111 15 Exit Command Mode
Device Identification
In response to the DEVICE IDENTIFICATION command, the module sends back 6 bytes
(including a check sum): 0x00, 0x00, 0x02, 0x18, 0x18, 0x0C, 0x00, 0xDA. This will
identify the module as an ETAS LA3 to INCA software.
Simulated O
2
Sensor (EGO) Output
Since the UEGO sensor used by the F/A Monitor has the same thread size as most production
O
2
sensors (i.e. EGO or HEGO sensors), the production mounting hole can be used.
However, if the production O
2
sensor is not connected to the engine control unit (ECU), the
ECU may go into "back-up" mode. The F/A Monitor avoids this problem by providing a
simulated O
2
sensor output that can be fed into the ECU.
The simulated O
2
sensor output is a 0V (lean) to 1V (rich) signal that switches at
Lambda=1.0. This is the same switch point as the production O
2
sensor. The simulated O
2
sensor output is available at the short black wire near the blue connector of the wiring
harness. A connection must be made between the black wire and the vehicle's O
2
sensor
signal wire on the vehicle's wiring harness. Note that the production O
2
sensor is both
electrically and physically disconnected from the vehicle when the simulated O
2
sensor
output is being used.
When using the simulated O
2
sensor feature, two things must be kept in mind:
The vehicle's ECU may have a feature to detect if the O
2
sensor's heater is operating properly.
If this is the case, an electrical connection between the O
2
( not the UEGO) sensor's heater
wires and the vehicle's wiring harness must be made.
The vehicle's ECU may have a feature to detect if the O
2
sensor is operating properly by
pumping current into and out of the O
2
sensor. Depending on the sophistication of the
feature, it may be that the stock O
2
sensor must be left alone and another mounting location
be used for the UEGO sensor.