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 ...Missing:
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 ECM
IGN
FC
MAIN MAIN FL
Battery
Starter Relay Starter
AM2
Ignition Switch
ST ST
Tr
From
Park/Neutral Position Switch
Crankshaft
(NE Signal) NE
Position Sensor
(STA Signal) STA
FI7241
2002 ECHO (RM884U)
Author:
Date:
311
DI-142 DIAGNOSTICS
-
ENGINE
WIRING DIAGRAM I10 Ignition Switch W-R
6
5
B-R
AM1 IG2
1O 1
1O 6 Instrument Panel J/B
Instrument Panel J/B 1A 7
ECM
1A 3 B-Y B-R
W-R 1
1 2
1
2
1 EFI
AM2 1
Instrument Panel JB 2 1
1 F6 2 MAIN
Engine Room R/B No. 1 Fusible Link Block
5
EFI Relay
1
B-L
Engine Room R/B No. 1
1
Circuit Opening Relay 9 2 1 1H
3 1 B-Y
11 1A
5
3
W-B
6 1T
F10 Fuel Pump
G
14 E4
FC
B-R
4 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 ).
Check voltage between terminal FC of ECM and body ground. ON
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
FC
(-)
(+) A09047
NG
Check for open in harness and connector between 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 (Marking: 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
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.
FC
OK Fuel Inlet Hose
BE6653 A09047 B09224
Proceed to next circuit inspection shown on problem symptoms table (See page DI-21 ).
A09116
NG
2
Check for ECM power source circuit (See page DI-138 ).
The fuel pump adopted for this model is a vacuum-type fuel pump which ... and deliver fuel from the fuel tank to the carburetor through the suction valve and ...
Main Jet (The slow jet also works.) Low & Middle Speed Supplementary Device: Vacuum Tube. Low Speed Air Jet. Main Jet. Vacuum Diaphragm. Throttle. Valve.
(c) Select the active test mode on the TOYOTA hand-held tester. (d) Please refer to the TOYOTA hand-held tester operator's manual for further details. (e) If you ...Missing:
May 26, 2017 - A quick simple test of a fuel pump is to remove it from the motor, and blow ... on the small connection, the same noise should be present there.
May 26, 2017 - Carburetor : Do not think that you can up the horsepower by simply ... Matter of fact that is what years ago got me into writing the original of this article so ...... have to make adjustments on trial and error, until we find a happy
electric pump but could also be a hand- operated ... The Fuel Pressure Gauge Installation. The fuel ... ence between the repair of an old pump and the ... hoses, controls, and wires that virtually hide the .... practical manner to include all neces-.
Nov 22, 2002 - Connect VAG 1527B voltage tester between Ground (GND) and either of the fuse ... Check triggering page 24-27 . ... pump relay -J17- Repair Group 01. ... Connect multimeter (Fluke 83 or equivalent) between sockets 28 (B+).
