P1220

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

Description

SYSTEM DESCRIPTION






This system controls the fuel pump operation. The amount of fuel flow delivered from the fuel pump is altered between two flow rates by the FPCM operation. The FPCM determines the voltage supplied to the fuel pump (and therefore fuel flow) according to the following conditions.






COMPONENT DESCRIPTION




The FPCM adjusts the voltage supplied to the fuel pump to control the amount of fuel flow. When the FPCM increases the voltage supplied to the fuel pump, the fuel flow is increased. When the FPCM decreases the voltage, the fuel flow is decreased.

CONSULT-III Reference Value in Data Monitor Mode






On Board Diagnosis Logic






DTC Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V with ignition switch ON.

WITH CONSULT-III
1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-III.
2. Make sure that "COOLAN TEMP/S" indicates less than 70 °C (158 °F). If not, cool down the engine.
3. Start engine.
4. Hold vehicle at the following conditions for 12 seconds.






5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to "Diagnosis Procedure".

WITH GST
Follow the procedure WITH CONSULT-III above.

Wiring Diagram

EC-FPCM-01:

Diagnosis Procedure

Step 1-2:

Step 2 (Continued)-5:

Step 5 (Continued)-9:

Step 9 (Continued)-12:

Component Inspection

FUEL PUMP CONTROL MODULE






1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.




3. Check voltage between FPCM terminal 4 and ground under the following conditions.
4. If NG, replace fuel pump control module.