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ENGINE 273 MPFI
CABLE COLOR CODES
WIRE CODE WIRE COLOUR
B
BLACK
BR
BROWN
G
GREEN
GY
GREY
L
BLUE
O
RANGE
P
PINK
R
RED
W WHITE
Y
YELLOW
V
VIOLET
LG
LIGHTGREEN
SB
SKY BLUE
ECUHANDLING ANDCARE
Earth (Ground) Connection :
•
Ensure all the ground connections are fixed
correctly.
•
DO NOT leave any grounded wire loose or open.
•
ECUground pins should be groundedwithin 300mm
from the ECU.
Power Supply :
•
At IGNITION ON, ECU starts functioning and
initializes, the power for the main drivers for the
ECUare taken from theMAINRELAYpower supply.
TheMAINRELAYoutput stage gives 12 volts when
ECU grounds the MAIN RELAY at IGNITION ON.
After IGNITION OFF the ECU holds the MAIN
RELAYGROUND for some duration known as the
POWER LATCH period so that the vital
functionalities are powered ON for that duration.
Precaution :
Do not disconnect the connector of the ECU for at
least 1 minute after IGNITION OFF.
Never disconnect the connector of the ECU during
IGNITIONON.
•
Ensure that ignition switch is in OFF position while
plugging - in the connector to the ECU.
Input
•
Ensure that the Input signal line is as far as possible
away from noise sources such as
High Tension Cable, Horn relay, Motor etc.
•
Ensure that sealed wire are used for input line of
lambada oxygen Sensor, CrankAngle Sensor and
the wiring is as far as possible from the noise
sources similar to the ones above. Sensor ground
connections should not be shorted to 12 volts
supply.
Output
•
Take care to avoid dead - short (solenoid short -
circuit etc.) and similar circuit misconnection while
checking (to avoid any damage). Use a solenoid
which does not use a fly - back diode (reverse
polaritymay damage theOutput Power Transistor).
Installation
•
Ensure that the ECU is secured firmly to the body
using screws.
•
Ensure that there is no water seepage into the ECU.
•
Do not use an ECU which has been dropped once.
•
Do not try to repair the ECU.
•
Use standard harness for circuit connections.
•
Do not try to insert any thing into the ECU case.
•
Take care to avoid any bending of the connector
pins while inserting the connector.
•
Ensure that the connector is inserted in the end
after all the installation is complete.
•
To carry out welding job on the car the ECU should
be disconnected.