Daewoo MATIZ Service Manual page 218

1F – 120 ENGINE CONTROLS
DTC P1231 – Fuel Pump Relay High Voltage (Cont'd)
Step
1. Replace the ECM.
2. Turn the ignition OFF for 10 seconds.
10 3. Clear any DTCs from ECM.
4. Turn the ignition switch to ON.
Does the fuel pump operate?
1. Using the scan tool, clear the DTCs.
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the conditions for
11
setting this DTC ad specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
Check if any additional DTCs are set.
12
Are any DTCs displayed that have not been
diagnosed?
Action Value(s) Yes
2.55 seconds System OK
–
Go to Step 12
Go to
applicable DTC
–
table
No
Go to Step 11
Go to Step 2
System OK
DAEWOO M-150 BL2