P1220
P1220 FUEL PUMP CONTROL MODULE (FPCM) DescriptionSystem 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-II Reference Value In Data Monitor Mode:
On Board Diagnosis Logic
Malfunction is detected when an improper voltage signal from the FPCM, which is supplied to a point between the fuel pump and the dropping resistor, is detected by ECM.
Possible Cause
- Harness or connectors (FPCM circuit is shorted.)
- Dropping resistor
- FPCM
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 10.0 V with ignition switch "ON".
With CONSULT-II
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT-II.
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. If 1st trip DTC is detected, go to "Diagnostic Procedure".
With GST
Follow the procedure "WITH CONSULT-II" above.
EC-FPCM-01:
Wiring Diagram
Step 1 - 3:
Step 4 - 7:
Step 8 - 11:
Diagnostic Procedure
Component Inspection
Fuel Pump Control Module:
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 body ground under the following conditions.
4. If NG, replace fuel pump control module.