Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg fuelpump
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DI-141
DIAGNOSTICS - ENGINE
DI6VR-02
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
EFI Main Relay Circuit Opening Relay Fuel Pump
EFI
IG Switch
IGN ECM
MAIN FC
Tr
Starter Relay Starter
AM2
MAIN
FL ST
From
ST
Ignition Park/Neutral Crankshaft (NE Signal) NE
Switch Position Switch Position Sensor
Battery
(STA Signal) STA
FI7241
2002 ECHO (RM884U)
Author : Date : 311
DI-142
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
I10 Ignition Switch
W-R 5 6 B-R
AM1 IG2
1O 1 1O 6
Instrument Instrument
Panel J/B Panel J/B ECM
1A 7 1A 3
B-Y
W-R B-R
1 1 1 1 Engine Room
R/B No. 1
2 2 1 5
AM2 EFI EFI Instrument Panel JB
Relay Circuit Opening
1 1 2 3 Relay
9 14 FC
1 2 G
1 1H E4
1 1
B-L Engine Room 11 6
R/B No. 1 B-Y 5 3 B-R
F6 2 1A 1T
Fusible Link
MAIN Block
W-B 4
F10
Fuel
Pump 5
Battery
EC BG
A09141 A17562
2002 ECHO (RM884U)
Author : Date : 312
DI-143
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect the TOYOTA hand-held tester and check operation of fuel pump (See
page DI-3 ).
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-21 ).
NG
2 Check for ECM power source circuit (See page DI-138 ).
NG Repair or replace.
OK
3 Check circuit opening relay (Marking: CIR OPN) (See page SF-48 ).
NG Replace circuit opening relay.
OK
2002 ECHO (RM884U)
Author : Date : 313
DI-144
DIAGNOSTICS - ENGINE
4 Check voltage between terminal FC of ECM and body ground.
ON FC PREPARATION:
(a) Remove the connector cover from the ECM.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal FC of the ECM and body
ground.
(-) (+) OK:
Voltage 9 - 14 V
A09047
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay
and ECM (See page IN-29 ).
OK
5 Check fuel pump (See page SF-6 ).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay (Mark-
ing: CIR OPN) and fuel pump and body ground (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 314
DI-145
DIAGNOSTICS - ENGINE
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check operation of fuel pump.
ON FC PREPARATION:
(a) Remove the connector cover from the ECM.
(b) Turn the ignition switch ON.
CHECK:
(a) Connect between terminal FC of the ECM connector and
body ground.
(b) Check for fuel pressure in the fuel inlet hose when it is
pinched off.
OK:
There is pressure in fuel inlet hose.
HINT:
At this time, you will hear a fuel return flowing noise.
OK Proceed to next circuit inspection shown on
BE6653 Fuel Inlet Hose problem symptoms table (See page DI-21 ).
A09047
B09224 A09116
NG
2 Check for ECM power source circuit (See page DI-138 ).
NG Repair or replace.
OK
3 Check circuit opening relay (Marking: CIR OPN) (See page SF-48 ).
NG Replace circuit opening relay.
OK
2002 ECHO (RM884U)
Author : Date : 315
DI-146
DIAGNOSTICS - ENGINE
4 Check voltage between terminal FC of ECM and body ground (See page
DI-141 ).
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay
and ECM (See page IN-29 ).
OK
5 Check fuel pump (See page SF-6 ).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay (Mark-
ing: CIR OPN) and fuel pump and body ground (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 316
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