Fuel Pump Relay Circuit Check - Daewoo MATIZ Service Manual

1F – 36 ENGINE CONTROLS
Circuit Description
When the ignition switch is turned ON, the Engine Con-
trol Module (ECM) will supply battery voltage to activate
the fuel pump relay and run the in-tank fuel pump. The
fuel pump will operate as long as the engine is cranking
or running and the ECM is receiving ignition reference
pulses.
Step
1. Turn the ignition OFF for 10 seconds.
2. Turn the ignition ON.
1
3. Listen for in-tank fuel pump operation.
Does the fuel pump operate for the time specified?
1. Turn the ignition OFF.
2. Connect battery positive to fuel pump test
connect.
2
3. Listen for in-tank fuel pump operation.
Does the fuel pump operate?

FUEL PUMP RELAY CIRCUIT CHECK

Fuel Pump Relay Circuit Check
Action
If there are no reference pulses, the ECM will shut off
the fuel pump within 2 seconds after the ignition switch
is turned ON.
Diagnostic Aids
An intermittent problem may be caused by a poor con-
nection, rubbed through wire insulation, or a broken wire
inside the insulation.
Value(s)
2 sec System OK
–
Go to Step 4
MAA1F040
Yes No
Go to Step 2
Go to Step 3
DAEWOO M-150 BL2