1998 TOYOTA LAND CRUISER Engine control module

- DIAGNOSTICSAUTOMATIC TRANSMISSION
DI-367
560 Author
: Date
:
6. DEFINITION OF TERMS
TermDefinition
Monitor descriptionDescription of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCsDiagnostic code
Typical enabling condition
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
Sequence of operation
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
While another sensor is being monitored, the next sensor or component will not be monitored until the previous
monitoring has concluded.
Required sensor/compo-
nentsThe sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation
The number of times that the ECM checks for malfunctions per driving cycle.
ºOnce per driving cycleº means that the ECM detects malfunction only one time during a single driving cycle.
ºContinuousº means that the ECM detects malfunction every time when enabling condition is met.
DurationThe minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the ºtypical enabling conditionsº are met.
Malfunction thresholdsBeyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation
MIL illumination timing after a defect is detected.
ºImmediatelyº means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
º2 driving cycleº means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
7. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS nameDefinition
Toyota HCAC system, Hydrocarbon adsorptive Catalyst
(HCAC) system, HC adsorptive three-way catalystHC adsorptive three-way catalytic converter
Variable Valve Timing sensor, VVT sensorCamshaft position sensor
Variable valve timing system, VVT systemCamshaft timing control system
Camshaft timing oil control valve, Oil control valve OCV,
VVT, VSVCamshaft timing oil control valve
Variable timing and lift, VVTLCamshaft timing and lift control
Crankshaft position sensor ºAºCrankshaft position sensor
Engine speed sensorCrankshaft position sensor
THAIntake air temperature
Knock control moduleEngine knock control module
Knock sensorEngine knock sensor
Mass or volume air flow circuitMass air flow sensor circuit
Vacuum sensorManifold air pressure sensor
Internal control module, Control module, Engine control
ECU, PCMPower train control module
FC idleDeceleration fuel cut
Idle air control valveIdle speed control
VSV for CCV, Canister close valve VSV for canister controlEvaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1,
EVAP VAV, Purge VSVEvaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSVEvaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative
emission control system pressure sensorFuel tank pressure sensor
Charcoal canisterEvaporative emissions canister
ORVR systemOn-boad refueling vapor recovery system
Intake manifold runner controlIntake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)Intake manifold tuning valve
Intake control VSVIntake manifold tuning solenoid valve

DI-368
- DIAGNOSTICSAUTOMATIC TRANSMISSION
561 Author
: Date
:
AFSAir fuel ratio sensor
O2 sensorHeater oxygen sensor
Oxygen sensor pumping current circuitOxygen sensor output signal
Oxygen sensor reference ground circuitOxygen sensor signal ground
Accel position sensorAccelerator pedal position sensor
Throttle actuator control motor, Actuator control motor, Elec-
tronic throttle motor, Throttle control motorElectronic throttle actuator
Electronic throttle control system, Throttle actuator control
systemElectronic throttle control system
Throttle/pedal position sensor, Throttle/pedal position switch,
Throttle position sensor/switchThrottle position sensor
Turbo press sensorTurbocharger pressure sensor
Turbo VSVTurbocharger pressure control solenoid valve
P/S pressure switchPower-steering pressure switch
VSV for ACMActive control engine mount
Speed sensor, Vehicle speed sensor ºAº, Speed sensor for
skid control ECUVehicle speed sensor
ATF temperature sensor, Trans. fluid temp. sensor, ATF
temperature sensor ºAºTransmission fluid temperature sensor
Electronic controlled automatic transmission, ECTElectronically controlled automatic
Intermediate shaft speed sensor ºAºCounter gear speed sensor
Output speed sensorOutput shaft speed sensor
Input speed sensor, Input turbine speed sensor ºAº, Speed
sensor (NT), Turbine speed sensorInput turbine speed sensor
PNP switch, NSWPark/neutral position switch
Pressure control solenoidTransmission pressure control solenoid
Shift solenoidTransmission shift solenoid valve
Transmission control switch, Shift lock control unitShift lock control module
Engine immobilizer system, Immobilizer systemVehicle anti-theft system

DI-294
- DIAGNOSTICSENGINE
487 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0604 Internal Control Module Random Access
Memory (RAM) Error
DTC P0606 ECM/PCM Processor
DTC P0607 Control Module Performance
DTC P0657 Actuator Supply Voltage Circuit / Open
MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal ºmirroringº of the main CPU and the sub CPU to detect
RAM (Random Access Memory) errors. The two CPUs also perform continuous mutual monitoring.
The ECM sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the sig-
nals to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator sup-
ply voltage, and 4) any other ECM malfunction is found.
DTC No.DTC Detecting ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM malfunction
ECM
MONITOR STRATEGY
P0604Random access memory (RAM) error range
check
Related DTCsP0606ECM range check/description
P0657Actuator supply voltage circuit range check
Required sensors/componentsECM
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
The typical enabling condition is not avail-
able-
DI1MF-1 1

DI-42
- DIAGNOSTICSENGINE
235 Author
: Date
:
2004 LAND CRUISER (RM1071U)P0442
(DI-245)
Evaporative Emission Control
System Leak Detected (Small
Leak)
After the negative pressure introduction has been completed, if
the pressure in the EVAP system sharply increases.

Hose or tube cracked, holed, damaged or loose seal ((3) in
Fig. 1)

Fuel tank cap incorrectly installed

Fuel tank cap cracked or damaged

Vacuum hose cracked, holed, blocked, damaged or discon-
nected ((1), (2), (4), (5), (6), (7), (8) and (9) in Fig. 1)

Fuel tank cracked, holed or damaged

Charcoal canister cracked, holed or damaged

Open or short in vapor pressure sensor circuit

Vapor pressure sensor

ECM

P0446
(DI-222)Evaporative Emission Control
System Vent Control Circuit
Same as DTC No. P0441
P0451
(DI-268)Evaporative Emission Control
System Pressure Sensor/Switch
Range/Performance
Open or short in vapor pressure sensor circuit

Vapor pressure sensor

ECM

P0452
(DI-268)Evaporative Emission Control
System Pressure Sensor/Switch
Low Input
Open in vapor pressure sensor circuit

Vapor pressure sensor

ECM

P0453
(DI-268)Evaporative Emission Control
System Pressure Sensor/Switch
High Input
Short in vapor pressure sensor circuit

Vapor pressure sensor

ECM

P0455
(DI-245)Evaporative Emission Control
System Leak Detected (Gross
Leak)

Same as DTC No. P0442
P0456
(DI-245)Evaporative Emission Control
System Leak Detected (Very
Small Leak)

Same as DTC No. P0442
P0500
(DI-274)Vehicle Speed Sensor ºAº
Combination meter

Open or short in vehicle speed sensor circuit
P0503
(DI-274)Vehicle Speed Sensor ºAº Inter-
mittent/Erratic/High

Oen or short in vehicle s eed sensor circuit

Vehicle speed sensor

ECM-
P0504
(DI-278)Brake Switch ºAº/ºBº Correlation

Short in stop lamp switch signal circuit

STOP fuse

Stop lamp switch

ECM
-
P0505
(DI-286)Idle Air Control System

Air induction system

Electric throttle control system

PCV hose connection

P0560
(DI-290)System Voltage

Back-up power source circuit

EFI or ECD No. 1 fuse

ECM

P0571
(DI-993)Brake Switch ºAº Circuit

Stop light switch signal circuit

Stop light switch

ECM
-
P0604
(DI-294)Internal Control Module Random
Access Memory (RAM) Error
ECM
P0606
(DI-294)ECM/PCM Processor
ECM
P0607
(DI-294)Control Module Performance
ECM

DI-18
- DIAGNOSTICSENGINE
211 Author
: Date
:
TC/TE1
[Test Details]
Connect the TC and TE1.
ON or OFFSwitch to the same state as
the connection between
terminal TC and TE1.
FC IDL PROHBT
[Test Details]
Control the idle fuel cut prohibit.
ON or OFF
-
9. DEFINITION OF TERMS
TermDefinition
Monitor descriptionDescription of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCsDiagnostic code
Typical enabling condition
Preconditions that allow the ECM to detect malfunctions.
With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
Sequence of operation
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
When a sensor is being monitored, the next sensor or component will not be monitored until the sensor monitoring
is finished.
Required sensor/compo-
nentsThe sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation
The number of times that the ECM checks for malfunctions per driving cycle.
ºOnce per driving cycleº means that the ECM detects the malfunction only one time during a single driving cycle.
ºContinuousº means that the ECM detects malfunction every time an enabling condition is met.
DurationThe minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
DTC. This timing begins after the ºtypical enabling conditionsº are met.
Malfunction thresholdsBeyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation
MIL illumination timing after a defect is detected.
ºImmediatelyº means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
º2 driving cycleº means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
cycle.
10. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS nameDefinition
Toyota HCAC system, Hydro-carbon Adsorptive Catalyst
(HCAC) system, HC adsorptive three-way catalystHC adsorptive three-way catalytic converter
Variable Valve Timing sensor, VVT sensorCamshaft position sensor
Variable valve timing system, VVT systemCamshaft timing control system
Camshaft timing oil control valve, Oil control valve, OCV,
VVT, VSVCamshaft timing oil control valve
Variable timing and lift, VVTLCamshaft timing and lift control
Crankshaft position sensor ºAºCrankshaft position sensor
Engine speed sensorCrankshaft position sensor
THAIntake air temperature
Knock control moduleEngine knock control module
Knock sensorEngine knock sensor
Mass or volume air flow circuitMass air flow sensor circuit
Vacuum sensorManifold air pressure sensor
Internal control module, Control module, Engine control
ECU, PCMPower train control module
FC idleDeceleration fuel cut

- DIAGNOSTICSENGINE
DI-19
212 Author
: Date
:
Idle air control valveIdle speed control
VSV for CCV, Canister close valve VSV for canister controlEvaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1,
EVAP VSV, Purge VSVEvaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSVEvaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative
emission control system pressure sensorFuel tank pressure sensor
Charcoal canisterEvaporative emissions canister
ORVR systemOn-board refueling vapor recovery system
Intake manifold runner controlIntake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)Intake manifold tuning valve
Intake control VSVIntake manifold tuning solenoid valve
AFSAir fuel ratio sensor
O2 sensorHeater oxygen sensor
Oxygen sensor pumping current circuitOxygen sensor output signal
Oxygen sensor reference ground circuitOxygen sensor signal ground
Accel position sensorAccelerator pedal position sensor
Throttle actuator control motor, Actuator control motor, Elec-
tronic throttle motor, Throttle control motorElectronic throttle actuator
Electronic throttle control system, Throttle actuator control
systemElectronic throttle control system
Throttle/pedal position sensor, Throttle/pedal position switch,
Throttle position sensor/switchThrottle position sensor
Turbo press sensorTurbocharger pressure sensor
Turbo VSVTurbocharger pressure control solenoid valve
P/S pressure switchPower-steering pressure switch
VSV for ACMActive control engine mount
Speed sensor, Vehicle speed sensor ºAº, Speed sensor for
skid control ECUVehicle speed sensor
ATF temperature sensor, Trans. fluid temp. sensor, ATF
temperature sensor ºAºTransmission fluid temperature sensor
Electronic controlled automatic transmission, ECTElectronically controlled automatic
Intermediate shaft speed sensor ºAºCounter gear speed sensor
Output speed sensorOutput shaft speed sensor
Input speed sensor, Input turbine speed sensor ºAº, Speed
sensor (NT), Turbine speed sensorInput turbine speed sensor
PNP switch, NSWPark/neutral position switch
Pressure control solenoidTransmission pressure control solenoid
Shift solenoidTransmission shift solenoid valve
Transmission control switch, Shift lock control unitShift lock control module
Engine immobiliser system, Immobiliser systemVehicle anti-theft system

DI1L9-13
DI-48
- DIAGNOSTICSENGINE
241 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)
16.Starter
17.Starter relay
18.Park/neutral position switchST-16
ST-18
DI-402
No initial combustion (Does not start)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)DI-345
DI-350
IN-36
No complete combustion (Does not start)1. Fuel pump control circuitDI-350
Engine cranks normally but difficult to start
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI-336
DI-350
EM-3
Difficult to start with cold engine1. Starter signal circuit
2. Fuel pump control circuitDI-336
DI-350
Difficult to start with hot engine1. Starter signal circuit
2. Fuel pump control circuitDI-336
DI-350
High engine idle speed (Poor idling)1. A/C switch circuit
2. ECM power source circuit-
DI-345
Low engine idle speed (Poor idling)1. A/C switch circuit
2. Fuel pump control circuit-
DI-350
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM-3
DI-350
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI-345
DI-350
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI-350
DI-396
Surging (Poor driveability)1. Fuel pump control circuitDI-350
Engine stalls soon after starting1. Fuel pump control circuitDI-350
Engine stalls during A/C operation1. A/C switch circuit
2. Engine control module (ECM)-
IN-36
Unable to refuel/Difficult to refuel1. ORVR system-

2004 LAND CRUISER (EWD548U)
70G ELECTRICAL WIRING ROUTING
Position of Parts in Instrument Panel
A 14 Accel Position Sensor
A 18 A/C Solar Sensor
A 19 A/C Thermistor
A 24 Air Inlet Control Servo Motor
A 25 Air Mix Control Servo Motor
A 26 Air Vent Mode Control Servo Motor
A 27 Airbag Squib (Front Passenger Airbag Assembly)
A 28 Airbag Squib (Steering Wheel Pad)
A 29 Ashtray Illumination
A 30 Auto Antenna Control Relay
A 31 Automatic Light Control Sensor
A 41 ABS & BA & TRAC & VSC ECU
A 42 ABS & BA & TRAC & VSC ECU
A 43 ABS & BA & TRAC & VSC ECU
A 44 ABS & BA & TRAC & VSC ECU
A 45 A/C Control Assembly
A 46 A/C Control Assembly
A 47 A/C Control Assembly
A 48 A/T Shift Lever Illumination
Shift Lock Control ECU
B 1 Blower Motor Controller
B 7 Body ECU
B 8 Body ECU
B 9 Body ECU
C 5 Center Diff. Lock Control Relay
C 10 Cigarette LighterC 11 Cigarette Lighter Illumination
C 12 Combination Meter
C 13 Combination Meter
C 14 Combination Meter
C 15 Combination Meter
C 16 Combination SW
C 17 Combination SW
C 18 Combination SW
C 19 Combination SW
C 25 Center Airbag Sensor Assembly
C 26 Center Airbag Sensor Assembly
C 27 Center Airbag Sensor Assembly
C 28 Center Cluster Integration Panel
D 7 Data Link Connector 3
D 26 DVD Automatic Changer
E 4 Electronically Controlled Transmission Pattern Select SW
E 5 Engine Control Module
E 6 Engine Control Module
E 7 Engine Control Module
E 8 Engine Control Module
E 9 Engine Control Module
G 3 Glove Box Light
G 4 Gateway ECU
I 18 Ignition SW