1998 TOYOTA LAND CRUISER relay

- DIAGNOSTICSENGINE
DI-345
538 Author
: Date
:
2004 LAND CRUISER (RM1071U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI or ECD relay control circuit in the ECM sends a signal to terminal MREL of the ECM switching on
the EFI or ECD relay.
This signal causes current to flow to the coil, closing the contacts of the EFI or ECD relay and supplying pow-
er to terminal +B of the ECM.
DIB2X-02

A19975
ECM
IGSW
+B
MREL
E1 9
E9
E9
E9
E7 4D 4E 3E 3E14 9 8 4
A A
6741 10
536 2E2A
2A 2D1
9
11 1
1
11
1 1
1 8 2 15 3
24
2
44 43
1B 1A5D
5C 1C
1B
1B Cowl Side J/B RH
Engine Room J/B
J/B No. 5 J4
J/C
Cowl Side J/B LH I18
Ignition SW
AM2 IG2
Engine Room R/B
Engine Room J/B
MAIN
BatteryEFI or ECD Relay
EA ECB-R B-R B-R
B-R W-R W-R
B-Y
B-Y
W-R B-G
B-YB-Y
B-W B-W
W-B W-B BR
F15
FL Block
EFI or ECD No. 1
IGN
AM2J/B No. 4 DI-346
- DIAGNOSTICSENGINE
539 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

A19976
Engine Room J/B:
EFI or ECD No. 1 Fuse
- DIAGNOSTICSENGINE
DI-349
542 Author
: Date
:
2004 LAND CRUISER (RM1071U)
7 Check EFI or ECD No. 1 fuse of engine room J/B.
PREPARATION:
Remove the EFI or ECD No. 1 fuse from the engine room J/B.
CHECK:
Check continuity of EFI or ECD No. 1 fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to EFI or ECD No. 1 fuse.
OK
8 Check EFI or ECD relay (See page SF-38).
NG Replace EFI or ECD relay.
OK
9 Check for open and short in harness and connector between terminal MREL of
ECM and body ground (See page
IN-36).
NG Repair or replace harness or connector.
OK
Check and repair harness or connector be-
tween EFI or ECD No. 1 fuse and battery

(See page
IN-36).

DI-350
- DIAGNOSTICSENGINE
543 Author
: Date
:
2004 LAND CRUISER (RM1071U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
Refer to DTC P0230 on page DI-162.
WIRING DIAGRAM
Refer to DTC P0230 on page DI-162.
INSPECTION PROCEDURE
Hand-held tester:
1 Check fuel pump operation (See page SF-7).
OK Go to step 8.
NG
2 Connect hand-held tester, and check operation of fuel pump relay.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
CHECK:
Check the operation of the fuel pump relay when it is switched ON and OFF by the hand-held tester.
OK:
Operating noise can be heard from the relay.
OK Go to step 4.
NG
3 Check operation of fuel pump relay (See page SF-40).
NG Replace fuel pump relay.
OK
DIB2Y-02

- DIAGNOSTICSENGINE
DI-351
544 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Check fuel pump (See page SF-7).
NG Repair or replace fuel pump.
OK
5 Check circuit opening relay (See page SF-39).
NG Replace circuit opening relay.
OK
6 Check for open in harness and connector between EFI or ECD relay and fuel
pump, and fuel pump and body ground (See page IN-36).
NG Repair or replace harness or connector.
OK

A19521A19629
FC(+)
ECM ConnectorE9
DI-352
- DIAGNOSTICSENGINE
545 Author
: Date
:
2004 LAND CRUISER (RM1071U)
7 Check voltage between terminal FC and E1 of ECM connector.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:
Voltage: 9 to 14 V
NG Check for open in harness and connector be-
tween battery and FC terminal of ECM (See page
IN-36).
OK
Proceed to problem symptoms table
(See page DI-48).
8 Check fuel pump resistor (See page SF-42).
NG Replace fuel pump resistor.
OK
Check for open in harness and connector between circuit opening relay and fuel pump resistor,
and fuel pump resistor and fuel pump (See page IN-36).

- DIAGNOSTICSENGINE
DI-353
546 Author
: Date
:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check operation of fuel pump (See page SF-7).
OK Go to step 7.
NG
2 Check operation of fuel pump relay (See page SF-40).
NG Replace fuel pump relay.
OK
3 Check fuel pump (See page SF-7).
NG Repair or replace fuel pump.
OK
4 Check circuit opening relay (See page SF-39).
NG Replace circuit opening relay.
OK
5 Check for open in harness and connector between EFI or ECD relay and fuel
pump, and fuel pump and body ground (See page IN-36).
NG Repair or replace harness or connector.
OK

A19521A19629
FC(+)
ECM ConnectorE9
DI-354
- DIAGNOSTICSENGINE
547 Author
: Date
:
2004 LAND CRUISER (RM1071U)
6 Check voltage between terminal FC of ECM connector and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:
Voltage: 9 to 14 V
NG Check for open in harness and connector be-
tween battery and FC terminal of ECM (See page
IN-36).
OK
Proceed to problem symptoms table
(See page DI-48).
7 Check fuel pump resistor (See page SF-42).
NG Replace fuel pump resistor.
OK
Check for open in harness and connector between circuit opening relay and fuel pump resistor,
fuel pump resistor and fuel pump (See page IN-36).