1998 TOYOTA LAND CRUISER Factory Repair Manual

check engine seat adjustment wheel alignment radio controls roof coolant level

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Page 2121 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
11 4Engine Control
(
Shielded)
(
Shielded)
BR- W
B- YELS1
E 125C 105B 1
G- W G- W
15 B 7
D 2E13
MG CLT Relay
HTR Relay L
Y- R
ELS ACMG ELS2C 23
LCKI
A/C Lock Sensor
31 2D F

Page 2122 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
11 5
2 1C 25 C24C 3L
G2 1C 27 C32C 1R
G
(
Shielded)
(
Shielded)
(
Shielded)
(
Shielded)
11B 2B1
EC1 3EC12
K 2
K 1W
B W
B
IF 4C 11 4E22
4D 8D 1
2D 22E 15
(
Shielded)
(
Shiel

Page 2123 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
11 6Engine Control
SB
2Q 66
2E 24
P- B
18 D
MPX14F 3
4C 12
B
29 D
MPX2
SB
B
IU1 9
4E 64E4
B
P- B
411 G 4* 1 : w/ Navigation System
(
*1)
(
*1)
MPD1 MPD2
EC A 6C7 A 7C4C1
W

Page 2124 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
11 7
Malfunction
Indicator Lamp
10A
ECU- B2From Power Source System (
See Page 94)
3Q 4410A
GAUGE1
2Q 65 57 2Q7. 5A
ACC
D 12 D11 D13 A10 A A
SB
SBSB SB
SB
D 16B 11
SBD 15 D

Page 2125 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
11 8Engine Control
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outline
of the engine control is giv

2004 LAND CRUISER (EWD548U)
11 8Engine Control
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outline
of the engine control is given here.
1. Input Signals
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built-in thermistor with a resistance which
varies according to the engine coolant temp. The engine coolant temp. is input into TERMINAL THW of the engine
control module as a control signal.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal to TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust emission is detected and is input as a control signal from the heated oxygen sensors
to TERMINALS OX1A, OX1B, OX2A, OX2B of the engine control module.
(4) RPM signal circuit
The camshaft position is detected by the camshaft position sensor and is input into TERMINAL G2+ of the engine
control module as a control signal. Also, the engine RPM is detected by the crankshaft position sensor and the signal is
input into TERMINAL NE+ of the engine control module.
(5) Throttle position sensor signal circuit
The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINALS
VTA1, VTA2 of the engine control module.
(6) Vehicle speed circuit
The vehicle speed sensor (Combination meter) detects the vehicle speed, and the signal is input into TERMINAL SPD
of the engine control module via the combination meter.
(7) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, the
voltage for engine control module start up power supply is applied through the EFI OR ECD relay, to TERMINALS +B,
+B2 of the engine control module. The current from the IGN fuse flows to TERMINAL IGSW of the engine control
module, and voltage is constantly applied to TERMINAL +BM.
(8) Intake air volume signal circuit
The intake air volume is detected by the mass air flow meter, and is input as a control signal to TERMINAL VG of the
engine control module.
(9) Stop light SW signal circuit
The stop light SW is used to detect whether the vehicle is braking or not, and the signal is input into TERMINAL STP of
the engine control module as a control signal.
(10) Starter signal circuit
To confirm whether the engine is cranking, the voltage applied to the starter motor when the engine is cranking is
detected, and is input into TERMINAL STA of the engine control module as a control signal.
(11) Engine knock signal circuit
Engine knocking is detected by the knock sensors, and is input into TERMINALS KNK1, KNK2 of the engine control
module as a control signal.
System Outline

Page 2126 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
11 9
2. Control System
*SFI system
The SFI system monitors the engine condition through the signals input from each sensors to the engine control module.
The control signal

2004 LAND CRUISER (EWD548U)
11 9
2. Control System
*SFI system
The SFI system monitors the engine condition through the signals input from each sensors to the engine control module.
The control signal is sent to the engine control module TERMINALS #1, #2, #3, #4, #5, #6, #7, #8 to operate the injector
(Fuel injection). The SFI system controls the fuel injection by the engine control module in response to the driving
conditions.
*ESA system
The ESA system monitors the engine condition through the signals input from each sensors to the engine control module.
The best ignition timing is decided according to this data and the data memorized in the engine control module. The
control signal is output to TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8, and these signals control the
igniter to provide the best ignition timing.
*Heated oxygen sensor heater control system
The heated oxygen sensor heater control system turns the heater on when the intake air volume is low (Temp. of exhaust
emission is low), and warms up the heated oxygen sensors to improve their detection performance. The engine control
module evaluates the signals from each sensors, and outputs current to TERMINALS HT1A, HT1B, HT2A, HT2B to
control the heater.
*Fuel pump control system
The engine control module supplies current to TERMINAL FPR, and controls the operation speed of the fuel pump by the
F/PUMP relay.
*ACIS
The ACIS includes a valve in the bulkhead separating the surge tank into two parts. This valve is opened and closed in
accordance with the driving conditions to control the intake manifold length in two stages, for increased engine output in all
ranges from low to high speeds.
*ETCS-i
The ETCS-i controls the engine output at its optimal level in accordance with the opening of the accelerator pedal, under
all driving conditions.
3. Diagnosis System
When there is a malfunction in the engine control module signal system, the malfunctioning system is recorded in the
memory. The malfunctioning system can be found by reading the code displayed on the malfunction indicator lamp.
4. Fail-Safe System
When a malfunction has occurred in any system, there is a possibility of causing engine trouble due to continued control
based on that system. In that case, the fail-safe system either controls the system using the data (Standard values)
recorded in the engine control module memory, or else stops the engine.
E2 Engine Coolant Temp. Sensor
1-2 : Approx. 15.0 kW (-20°C, -4°F)
: Approx. 2.45 kW (20°C, 68°F)
: Approx. 0.32 kW (80°C, 176°F)
E5 (A), E7 (C), E8 (D), E9 (E) Engine Control Module
BATT-E1 : Always 9.0-14.0 volts
+BM-E1 : Always 9.0-14.0 volts
IGSW-E1 : 9.0-14.0 volts with ignition SW at ON or ST position
+B, +B2-E1 : 9.0-14.0 volts with ignition SW at ON or ST position
VC-E2 : 4.5-5.5 volts with ignition SW on
VTA2-E2 : 2.0-2.9 volts with ignition SW on and accelerator pedal released
: 4.6-5.1 volts with ignition SW on and accelerator pedal depressed
VTA1-E2 : 0.4-1.0 volts with ignition SW on and accelerator pedal released
: 3.2-4.8 volts with ignition SW on and accelerator pedal depressed
THA-E2 : 0.5-3.4 volts with idling, intake air temp. 20°C (68°F)
THW-E2 : 0.2-1.0 volts with idling, engine coolant temp. 80°C (176°F)
W-E1 : 9.0-14.0 volts with idling
: Below 3.0 volts with ignition SW on
Service Hints

Page 2127 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
120Engine Control
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
A1470E9E70I1669
A4270F1272I1870
A45A70F1468J471
A47C70F16B68J1471
B770F17C68J1771
C168G168K169
C3

Page 2128 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
121
:Junction Block and Wire Harness Connector
CodeSee PageJunction Block and Wire Harness (Connector Location)
1A24Engine Room Main Wire and Engine Room J/B (Engine Compar

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