DTC 1305

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




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECCS ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
- Always perform in coolant temperature of more than 10°C (50°F).
- Confirm that battery voltage is more than 11 V at idle.

With Consult




(1) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(2) Start engine.
(3) Hold vehicle at the following conditions for 12 seconds.
CMPS-RPM (REF): 1,700 - 2,500 rpm (A/T)
2,000 - 3,000 rpm (M/T)
Vehicle speed: 70 - 100 km/h (44 - 62 MPH)
B/FUEL SCHDL: 1 - 5 ms
Selector lever: Suitable position

OR

With Generic Scan Tool
(1) Start engine.
(2) Hold vehicle at the following conditions for 12 seconds.

Engine speed: 1,700 - 2,500 rpm (A/T)
2,000 - 3,000 rpm (M/T)
Vehicle speed: 70 - 100 km/h (44 - 62 MPH)
Selector lever: "D" position

(3) Select "MODE 7" with GST.

OR

Without Scan Tool
(1) Start engine.
(2) Hold vehicle at the following conditions for 12 seconds.
Engine speed: 1,700 - 2,500 rpm (A/T)
2,000 - 3,000 rpm (M/T)
Vehicle speed: 70 - 100 km/h (44 - 62 MPH)
Selector lever: "D" position
(3) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(4) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.







DIAGNOSTIC PROCEDURE




WIRING DIAGRAM

COMPONENT INSPECTION
FPCM

With Consult
1. Start engine and let it idle.
2. Perform "FPCM" in "ACTIVE TEST" mode with CONSULT.
3. Check the following.




- When selecting "HI", "FPCM DR VOLT" indicates approximately 0 V.




- When selecting "LOW", "FPCM DR VOLT" indicates approximately 4.4 V.

4. If NG, replace FPCM.

OR

Without Consult
1. Start engine and warm it up to normal operating temperature.
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).

When starting engine:
Approximately 0 V

After starting engine:
Approximately 5 V

5. If NG, replace FPCM.

Dropping Resistor




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

Resistance: Approximately 0.8 Ohms at 25°C (77°F)