Page 1188 of 3115
- DIAGNOSTICSENGINE
DI-139
332 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
Heated rear oxygen sensor output voltage
(Crack) (Bank 1)
P0136Heated rear oxygen sensor output voltage
(Bank 1)
RltdDTC
Heated rear oxygen sensor slow response
(Bank 1)
Related DTCsHeated rear oxygen sensor output voltage
(Crack) (Bank 2)
P0156Heated rear oxygen sensor output voltage
(Bank 2)
Heated rear oxygen sensor slow response
(Bank 2)
Rid / tMain sensors/componentsHeated rear oxygen sensorRequired sensors/componentsRelated sensors/componentsMass air flow meter, Vehicle speed sensor
Frequency of operationOnce per drive cycle
Duration300 sec.
MIL operation2 driving cycles
Sequence of operationNone
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)
Case 1 (Output voltage (crack)):
Vehicle speed3 km/h (2 mph)-
IdleOFF
Fuel cutOFF
Time after fuel cut ON to OFF40 sec.-
Intake air amount per revolution0.7 g/rev-
Case 2 (Output voltage):
All of the following conditions are met:A, B, C and D
A. Pass/fail detection in this driving cycleNot detected
B. EngineRunning
C. Time after engine start0 sec.-
D. Either of the following conditions is
met:(a) or (b)
(a) Cumulative time while heated oxygen
sensor heater is ON22 sec.-
(b) At once more heated oxygen sensor
voltage0.2 V-
Case 3 (Slow response):
Rear oxygen sensor voltage before the
fuel cut0.2 V or more-
Catalyst conditionWarmed up
Engine coolant temperature75°C (167°F)-
Page 1198 of 3115
- DIAGNOSTICSENGINE
DI-149
342 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
P0171Fuel system lean (Bank 1)
RltdDTCP0172Fuel system rich (Bank 1)Related DTCsP0174Fuel system lean (Bank 2)
P0175Fuel system rich (Bank 2)
Main sensors/componentsFront oxygen sensor
Required sensors/componentsRelated sensors/componentsEngine coolant temperature sensor, Mass air flow
meter, Crankshaft position sensor
Frequency of operationContinuous
Duration10 sec.
MIL operation2 driving cycles
Sequence of operationNone
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)
Battery voltage11 V-
Fuel system: Closed loop13 sec.-
One of the following conditions is met:A or B
A. Engine speed-1,000 rpm
B. Intake air amount per revolution0.26 g/sec.-
Warm up condition to enable air fuel ratio
learning controlConditions are met
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Following condition is continue for 3 sec.A or B
A. Smoothed fuel trim learning value (Lean)40% or more
B. Smoothed fuel trim learning value (Rich)-35% or less
WIRING DIAGRAM
Refer to DTC P0031 on page DI-49.
Page 1218 of 3115
Crankshaft position sensor
(36-2 teeth or 12 teeth) Camshaft position sensor
ECM
A20490
- DIAGNOSTICSENGINE
DI-169
362 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The ECM illuminates the MIL (2 trip detection logic) if:
The ECM will illuminate the MIL when the percent misfire exceeds the specified limit per 1,000 engine revolu-
tions. One occurrence of excessive misfire during engine start will set the MIL. Four occurrences are required
to set the MIL 1,000 revolutions after engine start.
The ECM blinks the MIL (MIL blinks immediately) if:
Within 200 engine revolutions at a high rpm, the threshold for ºpercent of misfire causing catalyst dam-
ageº is reached 1 time.
Within 200 engine revolutions at a normal rpm, the threshold for ºpercent of misfire causing catalyst
damageº is reached 3 time.
MONITOR STRATEGY
P0300Random/Multiple cylinder misfire detected
P0301Cylinder 1 misfire detected
P0302Cylinder 2 misfire detected
P0303Cylinder 3 misfire detected
Related DTCsP0304Cylinder 4 misfire detectedRelated DTCs
P0305Cylinder 5 misfire detected
P0306Cylinder 6 misfire detected
P0307Cylinder 7 misfire detected
P0308Cylinder 8 misfire detected
Rid / t
Main sensors/componentsCamshaft position sensor, Crankshaft position
sensor
Required sensors/components
Related sensors/componentsEngine coolant temperature sensor, Intake air
temperature sensor, Throttle position sensor
Frequency of operationContinuous
DurationEvery 1,000 revolutions (soon after engine is started: 1 time, other 4 times) (emission related misfire)
Every 200 revolutions (1 or 3 times) (catalyst deteriorating misfire)
MIL operation2 driving cycles MIL ON
Immediate MIL blinking (Catalyst deteriorating misfire)
Sequence of operationNone
Page 1219 of 3115
DI-170
- DIAGNOSTICSENGINE
363 Author: Date:
2004 LAND CRUISER (RM1071U)
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)
Battery voltage8 V-
VVTNormal operation (i. e. not under scan-tool control)
Engine speed fluctuationEngine speed should not have changed rapidly
Engine speed (Two full revolutions (2 rev.)
after engine has started)400 rpm5,300 rpm
All of the following conditions are met:A, B and C
A. Engine coolant temperature-10C (14F)-
B. Either of the following conditions is met:(a) or (b)
(a) Intake air temperature-10C (14F)-
(b) Engine coolant temperature75C (167F)-
C. Either of the following conditions is
met:(a) or (b)
(a) Engine coolant temperature at engine
started-7C (19F)-
(b) Engine coolant temperature20C (68F)-
Intake air amount per revolution (varies
with engine speed)0.4 g/rev.-
Throttle position learningCompleted
Rapid throttle opening or closing operation has not occurred
Throttle position-Changing value of throttle position
Less than 0.5 per 0.008 sec.
Rough road counter-14 times/1,000 revolutions
(Not running on rough road)
For paired cylinder misfire (6 or 8 cylinders):
When ECT is between -10C (14F) and
75C (167F), the following conditions are
met:
A and B
A. Engine speed-3,000 rpm
B. Intake air amount per revolution at
1,800 rpm (varies with engine speed)0.7 g/sec.-
When ECT is over 75C (167F), the fol-
lowing conditions are met:A or (B and C)
A. NE signal plate tooth width learning was not completed
B. Engine speed-3,000 rpm
C. Intake air amount per revolution at
1,800 rpm (varies with engine speed)0.7 g/sec.-
Page 1220 of 3115
A19966
Battery I18
Ignition SW
#8#6 #4 #2
#7 #5ECM
#3 #1
7
5 2 1
4
3 3
1C1 F15
FL BlockEngine Room J/B
1B 6Cowl Side J/B LH
6
E7
E7 E6E5
Y
W G R
IG2
AM2E5 E5 E5 E5
5 I9
Injector No. 1
I16
Injector No. 8 I15
Injector No. 7 I14
Injector No. 6 I13
Injector No. 5 I12
Injector No. 4 I11
Injector No. 3 I10
Injector No. 2
AAJ4
J/C
Ib2 IN2712
AM22E 41
2A 10
9
2B-G
MAIN
B-W R-LL B 12
12 12 12
12 12 12 12
W-R W-R W-R B-R B-R B-R B-RB-R
B-R B-RB-R B-R B-R B-R B-R
B-RB-RB-R B-R B-R
- DIAGNOSTICSENGINE
DI-171
364 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Emission related misfire rate:
1. During the first 1,000 revolutions after engine start
(MIL is set when misfire is detected 1 time)
2. After the first 1,000 revolutions have occurred
(MIL is set when misfire is detected 4 times)
3 %/1,000 revolutions
Catalyst damage misfire count:
1. Low engine rpm area (ex. less than 3,000 rpm):
200 revolutions (MIL is set when misfire is detected 3
times)
2. High engine rpm area: Every 200 revolutions
96 count/200 revolutions
(Threshold varies with engine speed and intake air amount per revolution)
WIRING DIAGRAM
Refer to DTC P0351 on page DI-202 for the wiring diagram of the ignition system.
Page 1233 of 3115
DI-184
- DIAGNOSTICSENGINE
377 Author: Date:
2004 LAND CRUISER (RM1071U)
17 Check intake air temperature and mass air flow rate.
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
Check the intake air temperature.
(1) Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIRº.
(2) Read its value displayed on the hand-held tester or the OBD II scan tool.
OK:
Equivalent to ambient temperature
CHECK:
Check the air flow rate.
(1) Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAFº.
(2) Read its value displayed on the hand-held tester or the OBD II scan tool.
OK:
ConditionAir Flow Rate (gm/s)
Ignition switch ON (do not start engine)0
Idling4 to 6
Running without load (2,500 rpm)13 to 20
Idling to quickly acceleratingAir flow rate fluctuates
NG Replace mass air flow meter.
OK
Page 1236 of 3115
- DIAGNOSTICSENGINE
DI-187
380 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The knock sensor located on the cylinder block, detects spark knock.
When spark knock occurs, the sensor pick-up vibrates in a specific frequency range. When the ECM detects
the voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults
in the sensor. If the knock sensor signal level is too low for more than 10 sec., and if the knock sensor output
voltage is out of normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.
MONITOR STRATEGY
RltdDTCP0325Knock sensor (Bank 1) range check or rationalityRelated DTCsP0330Knock sensor (Bank 2) range check or rationality
Main sensors/componentsKnock sensor
Required sensors/componentsRelated sensors/components
Crankshaft position sensor, Camshaft position
sensor, Engine coolant temperature sensor,
Mass air flow meter
Frequency of operationContinuous
Duration10 sec.
MIL operationImmediate
Sequence of operationNone
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)
Battery voltage10 V-
IdleOFF
Time after engine start5 sec.-
Engine coolant temperature60C (140F)-
Intake air amount per revolution0.45 g/rev-
Engine speed2,000 rpm5,400 rpm
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor failure is indicated when the knock sensor output
level is below the specific threshold for:10 sec.
Page 1265 of 3115
A20598
Signal Length
Heated Oxygen Sensor Signal Length
Sensor Output
Voltage
Time DI-216
- DIAGNOSTICSENGINE
409 Author: Date:
DTC No.DTC Detecting ConditionTrouble Area
P0420
P0430
After engine and catalyst are warmed up, and while vehicle is
driven within set vehicle and engine speed range, waveform of
heated oxygen sensors have same amplitude
(2 trip detection logic)Gas leakage on exhaust system
Heated oxygen sensor (bank 1, 2 sensor 1, 2)
Three-way catalytic converter
HINT:
Bank 1 refers to the bank that includes cylinder No.1.
Bank 2 refers to the bank that does not include cylinder No.1.
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
MONITOR STRATEGY
RltdDTCP0420Bank 1 catalyst is deterioratedRelated DTCsP0430Bank 2 catalyst is deteriorated
Main sensors/componentsFront and rear heated oxygen sensor
Required sensors/componentsRelated sensors/components
Mass air flow meter, Engine coolant temperature
sensor, Engine speed sensor, Intake air tempera-
ture sensor
Frequency of operationOnce per driving cycle
Duration90 sec.
MIL operation2 driving cycles
Sequence of operationNone
