1986 TOYOTA LAND CRUISER start system

FI7132
Engine Speed
2,500 - 3,000 rpm
Idling
IG SW OFF(1)
Time Warmed up 3 min. or so Check (2)(3)
(4)
FI6514
OX Signal Waveform (Oscilloscope)
1.0 V
0 V
200 msec./Division DI-218
- DIAGNOSTICSENGINE
411 Author
: Date
:
CONFIRMATION ENGINE RACING PATTERN
(a) Connect the hand-held tester to the DLC3, or connect the probe of the oscilloscope between terminals
OXL1, OXL2, OXR1, OXR2 and E1 of the ECM connector.
(b) Start the engine and warm it up with all accessories switched OFF until engine coolant temperature
is stable.
(c) Race the engine at 2,500 - 3,000 rpm for about 3 minutes.
(d) After confirming that the waveform of the heated oxygen sensor (bank 1, 2 sensor 1 (OX1A, OX2A)),
oscillate around 0.5 V during feedback to the ECM, check the waveform of the heated oxygen sensor
(bank 1, 2 sensor 2 (OX1B, OX2B)).
HINT:
If there is a malfunction in the system, the waveform of the
heated oxygen sensor (bank 1, 2 sensor 2 (OX1B, OX2B)) is
almost the same as that of the heated oxygen sensor (bank 1,
2 sensor 1 (OX1A, OX2A)) on the left.
There are some cases where, even though a malfunction ex-
ists, the MIL may either light up or not light up.

A21544
CCV
Pressure Switching Valve
EVAP VSV
Cold Start
ECT/IAT near same temp.Open
ClosedOpen ClosedOpen
Closed
Closed
Closed Open
P0441, P0446,
P0455, P2418
Negative Pressure
OccursP0442, P0456
Tank & Canister
Leak CheckP0446
Pressure Switching
Valve Testing
(ex. Fuel tank cap loose)
(ex. Disconnect of vacuum hose)
P2418
CCV
Testing
Pressure
Switching
valve open
malfunction
(P2418)
(P0455) Gross Leak
P0442
P0456
- DIAGNOSTICSENGINE
DI-223
416 Author
: Date
:
DTC No.DTC Detecting ConditionTrouble Area
P0441
Pressure in charcoal canister and fuel tank does not drop dur-
ing purge control (2 trip detection logic)
Vacuum hose cracks, holed, blocked, damaged or discon-
nected
((1), (2), (3), (4), (5), (6), (7), (8) and (9) in Fig. 1)P0441During purge cut-off, pressure is very low compared with at-
mospheric pressure (2 trip detection logic)
nected ((1), (2), (3), (4), (5), (6), (7), (8) and (9) in Fig. 1)

Fuel tank cap incorrectly installed

Fuel tank cap cracked or damaged
No fuel tank pressure rise when commanding the CCV open
after an EVAP leak test
g

Open or short in vapor pressure sensor circuit

Vapor pressure sensor

Open or short in VSV circuit for EVAPP0446A high negative pressure (vacuum) does not occurs in the
system when commanding the EVAP VSV open and CCV
closed with the pressure switching valve open
Open or short in VSV circuit for EVAP

EVAP VSV

Open or short in VSV circuit for CCV


CCV
No fuel tank pressure change when commanding the pressure
switching valve closed for the check after the EVAP leak test

CCV

Open or short in VSV circuit for pressure switching valve

Pressure switching valve
P2418A high negative pressure (vacuum) does not occurs in the
system when commanding the EVAP VSV open and CCV
closed with the pressure switching valve open
g

Fuel tank cracked, holed or damaged

Charcoal canister cracked, holed or damaged

ECM
HINT:
Typical DTC output of each trouble part
Trouble partTypical DTC output (*1)
Small LeakP0442 and/or P0456
Medium Leak (ex.: Vacuum hose loose)P0455
Large Leak (ex.: Fuel tank cap loose)P0441, P0446, P0455 and P2418
EVAP VSVOpen MalfunctionP0441EVAP VSVClose MalfunctionP0441, P0446, P0455 and P2418
CCVOpen MalfunctionP0441, P0446, P0455 and P2418CCVClose MalfunctionP0446
PSithiVlOpen MalfunctionP2418Pressure Switching ValveClose MalfunctionP0441, P0446, P0455 and P2418
*1: ECM may output some other DTC combination.

A21544
CCV
Pressure Switching Valve
EVAP VSV
Cold Start
ECT/IAT near same temp.Open
ClosedOpen ClosedOpen
Closed
Closed
Closed Open
P0441, P0446,
P0455, P2418
Negative Pressure
OccursP0442, P0456
Tank & Canister
Leak CheckP0446
Pressure Switching
Valve Testing
(ex. Fuel tank cap loose)
(ex. Disconnect of vacuum hose)
P2418
CCV
Testing
Pressure
Switching
valve open
malfunction
(P2418)
(P0455) Gross Leak
P0442
P0456
DI-246
- DIAGNOSTICSENGINE
439 Author
: Date
:

MONITOR DESCRIPTION
A leak in the evaporative emission system prompts the ECM to set DTC P0442, P0455 or P0456.
The ECM checks for leaks in the system by introducing a high negative pressure (vacuum) from the intake
manifold by commanding the EVAP VSV open while the CCV (vent) is closed and the pressure switching
valve is open. After sufficient time has elapsed the fuel tank should have developed a high negative pressure
(vacuum) and the EVAP VSV closed. The ECM then monitors the pressure-rise (loss of vacuum) in the fuel
tank. If the pressure rises too rapidly, the ECM concludes that there is a leak in the system. The ECM will
turn on the MIL and set a DTC.
The ECM has separate DTCs for small and large leaks:
(1) DTC P0442 is set when the internal fuel tank pressure has a large increase and the EVAP system
has a small leak.
(2) DTC P0455 is set when the EVAP system has various large leaks. Even though the ECM sends
a signal to the EVAP VSV (when CCV is closed) to create a vacuum, the internal fuel tank pres-
sure does not decrease beyond a specified level.
(3) DTC P0456 is set when the internal fuel tank pressure increase slightly and the EVAP system
has a small leak.

- DIAGNOSTICSENGINE
DI-269
462 Author
: Date
:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detecting ConditionTrouble Area
P0451
Vapor pressure sensor output extremely changes under condi-
tions of (a) and (b): (2 trip detection logic)
(a) Vehicle speed: 0 km/h (0mph), Engine speed: Idling and
pressure switching valve is OFF
(b) Vapor pressure sensor value  opening pressure valve of
charcoal canister

Open or short in vapor pressure sensor circuit
P0452
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or less:
(2 trip detection logic)
Vapor pressure sensor

ECM
P0453
10 seconds or less after engine starting condition vapor pres-
sure sensor fixed value continues for fixed value or more:
(2 trip detection logic)
MONITOR STRATEGY
P0451
Related DTCsP0451Evaporative emission control system pressure
sensor range/performance
Main sensors/componentsVapor pressure sensor
Required sensors/componentsRelated sensors/componentsMass air flow meter, Engine coolant temperature
sensor
Frequency of operationOnce per driving cycle
DurationSignal fluctuation (noise) monitoring: 10 sec.
No signal change (stuck) monitoring: 20 min.
MIL operation2 driving cycles
Sequence of operationNone
P0452 and P0453
RltdDTC
P0452Evaporative emission control system pressure
sensor/switch low input
Related DTCs
P0453Evaporative emission control system pressure
sensor/switch high input
Main sensors/componentsVapor pressure sensor
Required sensors/componentsRelated sensors/componentsMass air flow meter, Engine coolant temperature
sensor
Frequency of operationOnce per driving cycle
Duration17 sec.
MIL operation2 driving cycles
Sequence of operationNone

- DIAGNOSTICSENGINE
DI-271
464 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
P0451
Detection CriteriaThreshold
Signal fluctuation (noise) monitoring:
The number of times the output changed
0.667 kPa (± 5
mmHg, ± 0.02 in.Hg) or more during 5 to 15 sec. after idling
and vehicle stop
5 times or more
No signal change (stuck) monitoring:
Fuel tank pressure ºno changeº time (less than 0.018 kPa
(0.135 mmHg, 0.005 in.Hg) change since engine start)10 min. or more
P0452 and P0453
Detection CriteriaThreshold
P0452:
Fuel tank pressureLess than -3.999 kPa (-30 mmHg, -1.18 in.Hg) / when engine running
P0453:
Fuel tank pressure1.999 kPa (15 mmHg, 0.59 in.Hg) or more / when engine running
WIRING DIAGRAM
Refer to DTC P0441, P0446 and P2418 on page DI-222.
INSPECTION PROCEDURE
HINT:

If different DTCs related to different system that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.

If DTC P0441 (Purge Flow), P0446 (CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor)
is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or P0453 first.
If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determin-
ing whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio
was lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
vapor pressure sensor.

DI-290
- DIAGNOSTICSENGINE
483 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0560 System Voltage
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the
ECM store data such as DTC history, freeze frame data, fuel trim values, and other data.
If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power
supply circuit. The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.
DTC No.DTC Detecting ConditionTrouble Area
P0560Open in back up power source circuit

Open in back-up power source circuit

EFI or ECD No.1 fuse

ECM
HINT:
If DTC P0560 present, the ECM will not store another DTC.
MONITOR STRATEGY
Related DTCsP0560System voltage malfunction
Required sensors/componentsECM
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate (*1)
Sequence of operationNone
*1: The DTC is set immediate. The MIL will be illuminated after the next engine start.
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Stand-by RAMInitialized
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Battery voltageLess than 3.5 V
DIC2M-01

A21430
From BatteryETCS Fuse
+BM
+M
-M
ME01ECM
Motor Control
Circuit Throttle Control Motor DI-310
- DIAGNOSTICSENGINE
503 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P2118 Throttle Actuator Control Motor Current
Range/Performance
CIRCUIT DESCRIPTION
The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is
monitored and when the voltage is low (less than 4V), the ECM concludes that the ETCS has a fault and
current to the throttle control motor is cut.
When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage
is low, the current to the motor is cut. If repairs are made and the system has returned to normal, turn the
ignition switch to OFF. The ECM then allows current to flow to the motor and the motor can be restarted.
HINT:
This Electrical Throttle Control System (ETCS) does not use a throttle cable.
DTC No.DTC Detection ConditionTrouble Area
P2118Open in ETCS power source circuit

Open in ETCS power source circuit

ETCS fuse

ECM
MONITOR DESCRIPTION
The ECM monitors the battery supply voltage applied to the electronic throttle motor. When the power supply
voltage drops below the threshold, the ECM concludes that the power supply has an open circuit. A DTC
is set and the MIL is turned on.
DIC2Q-01

A21034
T16
Component Side:
M+M- Throttle Control Motor and Sensor
- DIAGNOSTICSENGINE
DI-317
510 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check throttle control motor.
PREPARATION:
Disconnect the throttle control motor and sensor connector.
CHECK:
Measure the resistance between terminals of the throttle con-
trol motor.
OK:
Tester ConnectionSpecified Condition
M+ (T16-2) - M- (T16-1)0.3 to100 W (20°C (68°F))
NG Replace throttle body (See page SF-36).
OK
3 Replace ECM and clear DTC (Check if DTC outputs reoccur).
PREPARATION:
(a) Replace ECM.
(b) Clear the DTC (See page DI-3).
(c) Start and warm up the engine.
(d) Run the engine at idle for 15 seconds or more.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
OK:
No DTC output.
OK System is normal.
NG
Replace throttle body.