P1220
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
Specification data are reference values.
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 open or 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:
- Always perform test at temperature above 10° C (50° F).
- Confirm that battery voltage is more than 11 V at idle.
WITH CONSULT-II
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine.
3. Hold vehicle at the following conditions for 12 seconds.
CKPS.RPM (POS) 1,800 - 2,600 rpm
vehicle speed 70 - 100 KPH (44 - 62 MPH)
B/FUEL SCHDL 2 - 10 msec
Selector lever Suitable position
4. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.
WITH GST
Follow the procedure "WITH CONSULT-II" above.
EC-FPCM-01:
EC-FPCM-01 - Connector View:
Wiring Diagram
E87, E89, E83, B5, M17, M18, M19 Connector Views:
ECM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND 48.:
Diagnostic Procedure
Diagnostic Procedure Step 1:
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Diagnostic Procedure Step 3:
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Diagnostic Procedure Step 10:
