Sfi System (For Hatchback) Fuel Pump Control Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)
INSPECT NO. 1 INTEGRATION RELAY (C/OPN RELAY)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL PUMP - BODY GROUND)
INSPECT FUEL PUMP
READ VALUE USING TECHSTREAM (STARTER SIGNAL)
READ VALUE USING TECHSTREAM (ENGINE SPEED)
SFI SYSTEM (for Hatchback) - Fuel Pump Control Circuit |
DESCRIPTION
When the engine is cranked, the ST (Starter) relay drive signal is input to the STA terminal of the ECM, and NE signal generated by the crankshaft position sensor is also input to the NE+ terminal. Thus, the ECM interprets that the engine has been cranked, and turns the transistor Tr1 in the ECM internal circuit ON. The current flows to the C/OPN (Circuit Opening) relay by turning the Tr1 ON. Then, the fuel pump operates. While the NE signal is input to the ECM with the engine running, the ECM turns the Tr1 on continuously.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.
Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.
ResultResult
| Proceed to
|
Fuel pump operating sound does not occur
| A
|
Fuel pump operating sound occurs
| B
|
| 2.INSPECT NO. 1 INTEGRATION RELAY (C/OPN RELAY) |
Remove the No. 1 integration relay.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1E-4 - 1E-5
| Battery voltage not applied
| 10 kΩ or higher
|
Battery voltage applied to terminals 1D-9 and 1E-11
| Below 1 Ω
|
Text in Illustration*a
| Component without harness connected
(No. 1 Integration Relay Bottom View)
|
| 3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
Remove the No. 1 integration relay.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1E-11 - A72-21 (FC)
| Always
| Below 1 Ω
|
1E-11 or A72-21 (FC) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL PUMP - BODY GROUND) |
Remove the No. 1 integration relay.
Disconnect the fuel pump connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1E-5 - J71-4
| Always
| Below 1 Ω
|
J71-5 - Body ground
| Always
| Below 1 Ω
|
1E-5 or J71-4 - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
Inspect fuel pump (YARIS_NCP93 RM000000SL6038X.html).
- HINT:
- Perform "Inspection After Repair" after replacing the fuel pump (YARIS_NCP93 RM000004NJD006X.html).
| 6.READ VALUE USING TECHSTREAM (STARTER SIGNAL) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.
Check the result when the ignition switch is ON and the engine starts.
- OK:
Ignition Switch Position
| Techstream Display
(Starter Signal)
|
ON
| OFF
|
START
| ON
|
| 7.READ VALUE USING TECHSTREAM (ENGINE SPEED) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.
Read the values displayed on the Techstream while cranking.
- OK:
- Values are displayed continuously.
