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 applied 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 raised. When the FPCM decreases the voltage, the fuel flow is lowered.




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.




ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal and (25) (ECCS ground) with a voltmeter.




ON BOARD DIAGNOSIS LOGIC

OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the FPCM circuit. During this check, a DTC might not be confirmed.

With Consult
(1) Start engine.




(2) Select "FPCM" in "ACTIVE TEST" mode with CONSULT.
(3) Touch "HI" then "LOW" respectively.
(4) Check voltage between ECM terminal (28) and ground.

HI: Approximately 0V
LOW: Approximately 3.7V

OR

Without Consult
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Start engine and let it idle.




(4) Check voltage between ECM terminal (28) and ground.

Within 30 seconds of starting engine:
Approximately 0V
More than 30 seconds after starting engine:
Approximately 3.7V

EC-FPCM-01 Fuel Pump Control Module (FPCM) (DTC: P1220):

WIRING DIAGRAM







DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION
Fuel Pump Control Module
With Consult
1. Start engine and let it idle.




2. Perform "FPCM" in "ACTIVE TEST" mode with CONSULT.
3. Make sure of the following.
- When selecting "HI", "FPCM DR VOLT" indicates approximately 0V.




- When selecting "LOW", "FPCM DR VOLT" indicates approximately 3.7V.
4. If NG, replace FPCM.

OR

Without Consult
1. Start engine and warm it up sufficiently.
2. Turn ignition switch "OFF" and wait at least 5 seconds.
3. Start engine and let it idle.




4. Check voltage between terminals (1) and (2).

Within 30 seconds of starting engine:
Approximately 0V
More than 30 seconds after starting engine:
Approximately 3.7V

5. If NG, replace FPCM.

Dropping Resistor




Check resistance between terminals (1) and (2).

Resistance: Approximately 0.9 ohms at 25°C (77°F)