fuel TOYOTA LAND CRUISER 1986 Factory Workshop Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 1986, Model line: LAND CRUISER, Model: TOYOTA LAND CRUISER 1986Pages: 3115, PDF Size: 54.88 MB
Page 1179 of 3115
DI-130
- DIAGNOSTICSENGINE
323 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
RltdDTCP0134Excessive time to enter closed loop (Bank 1)Related DTCsP0154Excessive time to enter closed loop (Bank 2)
Main sensors/componentsFront heated oxygen sensor
Required sensors/componentsRelated sensors/componentsCrank position sensor, Engine coolant tempera-
ture sensor, Vehicle speed sensor
Frequency of operationOnce per drive cycle
Duration65 sec.
MIL operation1 driving cycle
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)
Both of the following conditions were metA and B
A. Time after following conditions met for
50 sec.(a), (b), (c), (d), (e) and (f)
(a) Engine coolant temperature40C (104°F)-
(b) Engine speed1,400 rpm-
(c) Vehicle speed40 km/h (25 mph)-
(d) IdleOFF
(e) Time after engine start180 sec.-
(f) Fuel enrichment correction factor163.998
B. Neither fail nor pass is determined yet in the present drive cycle
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Front heated oxygen sensor voltageLess than 0.45 V
COMPONENT OPERATING RANGE
ParameterStandard value
In the normal condition, the front heated oxygen sensor
voltage0 to 1 V
WIRING DIAGRAM
Refer to DTC P0031 on page DI-49.
Page 1180 of 3115
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Case 1
Case 2
Case 3
Case 4
Output voltage of heated oxygen
sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)Mainly suspect
trouble area
OK
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NGExtremely rich or lean of the
actual air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction
'
Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
Almost no reaction
Almost no reaction Almost no reaction
- DIAGNOSTICSENGINE
DI-131
324 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
The narrowing down the trouble area is possible by performing ACTIVE TEST of the following ºA/F CON-
TROLº (Heated oxygen sensor or another can be distinguished).
(a) Perform ACTIVE TEST by hand-held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine with the engine speed at 2,500 rpm for approximately 90 seconds.
(4) Select the item ºDIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROLº.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press the right or left button).
RESULT:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
+25 % " rich output: More than 0.5 V
-12.5 % " lean output: Less than 0.4 V
NOTICE:
However, there is a few seconds delay in the sensor 1 (front sensor) output. And there is about 20
seconds delay in the sensor 2 (rear sensor).
Page 1181 of 3115
DI-132
- DIAGNOSTICSENGINE
325 Author: Date:
2004 LAND CRUISER (RM1071U)
The following A/F CONTROL procedure enables the technician to check and graph the voltage output of
the heated oxygen sensors (sensor 1 and 2).
For displaying the graph indication, enter ºACTIVE TEST / A/F CONTROL / USER DATAº then select ºO2S
B1S1 and O2S B1S2º by pressing ºYESº button and push ºENTERº button before pressing ºF4º button.
HINT:
If different DTCs related to different systems terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may be open.
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.
A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mix-
ture. Check for conditions that would cause the engine to run rich.
A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mix-
ture. Check for conditions that would cause the engine to run lean.
1 Are there any other codes (besides DTCs P0134 and P0154) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
ºP0134 and/or P0154ºA
ºP0134 or P0154º and other DTCsB
HINT:
If any other codes besides P0134 and/or P0154 are output, perform the troubleshooting for those codes first.
B Go to relevant DTC chart (See page DI-36).
A
Page 1185 of 3115
DI-136
- DIAGNOSTICSENGINE
329 Author: Date:
2004 LAND CRUISER (RM1071U)
7 Check whether misfire is occurred or not by monitoring DTC and data list.
NG Perform troubleshooting for misfire
(See page DI-167).
OK
8 Check air induction system (See page SF-1).
CHECK:
Check the air induction system for vacuum leaks.
NG Repair or replace air induction system.
OK
9 Check fuel pressure (See page SF-7).
CHECK:
Check the fuel pressure (high or low pressure).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page SF-1).
OK
10 Check injector injection (See page SF-24)
NG Replace injector.
OK
Page 1186 of 3115
- DIAGNOSTICSENGINE
DI-137
330 Author: Date:
2004 LAND CRUISER (RM1071U)
11 Check exhaust system for gas leakage.
NG Repair or replace exhaust gas leakage point.
OK
Replace heated oxygen sensor (bank 1, 2 sensor 1).
12 Perform confirmation driving pattern (See page DI-106).
HINT:
Clear all DTCs prior to performing the confirmation driving pattern.
Go
13 Are there DTCs P0134 and P0154 being output again?
YES Replace ECM (See page SF-60).
NO
14 Confirm if vehicle has run out of fuel in past.
NO Check for intermittent problems
(See page DI-3).
YES
DTCs P0134 and P0154 are caused by running out of fuel.
Page 1187 of 3115
DI-138
- DIAGNOSTICSENGINE
331 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0136 Oxygen Sensor Circuit Malfunction (Bank 1
Sensor 2)
DTC P0156 Oxygen Sensor Circuit Malfunction (Bank 2
Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0031 on page DI-49.
DTC No.DTC Detecting ConditionTrouble Area
P0136
P0156
The following condition (a) or (b) continues 300 sec. or more.
(a) During driving with the engine warmed up, heated oxygen
sensor output does not change.
(b) Heated oxygen sensor output is very low most of the time.Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
HINT:
Bank 1 refers to bank that includes cylinder No. 1.
Bank 2 refers to bank that does not includes cylinder No. 1.
Sensor 2 refers to the sensor farther away from the engine assembly.
MONITOR DESCRIPTION
The ECM monitors the rear heated oxygen sensor in the following 3 items:
(1) If the rear heated oxygen sensor voltage changes between Rich and Lean while the vehicle is
running (repeating acceleration and deceleration). If not, the ECM interprets this as a malfunc-
tion, illuminates the MIL, and then sets DTC.
(2) If the rear heated oxygen sensor voltage does not remain at less than 0.05 V for a long time while
the vehicle is running. If not, the ECM interprets this as a malfunction, illuminates the MIL, and
then sets DTC.
(3) If the sensor's voltage drops to below 0.2 V (extremely Lean status) immediately when the ve-
hicle decelerates and the fuel cut is working. if not, the ECM interprets this to mean the sensor's
response feature has deteriorated, illuminates the MIL, and then sets DTC.
DIC29-01
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 1189 of 3115
DI-140
- DIAGNOSTICSENGINE
333 Author: Date:
2004 LAND CRUISER (RM1071U) Fuel cut
Operating
Time after engine start200 sec.-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Case 1 (Output voltage (crack)):
Following conditions are met:A, B and C
A. Cumulative rear heated oxygen sensor monitor time300 sec. or more
B. Time while rear heated oxygen sensor voltage is less
than 0.05 V180 sec. or more
C. Maximum rear heated oxygen sensor rich time (0.45 V or
more)Less than 20 sec.
Case 2 (Output voltage):
Number of heated oxygen sensor voltage ºswitchingº0 time or less
ºSwitchingº is counted when the sensor signal crosses the minimum or maximum voltage
Minimum voltageLess than 0.4 V
Maximum voltage0.5 V or more
Case 3 (Slow response):
Time until the rear oxygen sensor voltage drops to 0.2 V
after fuel cut starts operating6 sec. or more
COMPONENT OPERATING RANGE
ParameterStandard Value
Heated oxygen sensor voltage0 to 1 V
O2S TEST RESULT
Refer to page DI-3 for detailed information.
Rear HO2S voltage monitor
If the HO2S sensor voltage is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$07Minimum rear HO2S voltageN/AV
$08Maximum rear HO2S voltageN/AV
If the time required to change is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$31Time to change from Lean (<0.4 V)
to Rich (0.5 V)N/Asec.
$32Time to change from Rich (0.5
V) to Lean (<0.4 V)N/Asec.
Rear HO2S slow response monitor
If the elapsed time is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$37Until rear HO2S voltage drops to
0.2 V after fuel-cut startingN/Asec.
Page 1191 of 3115
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Case 1
Case 2
Case 3
Case 4
Output voltage of heated oxygen
sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)Mainly suspect
trouble area
OK
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NGExtremely rich or lean of the
actual air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction
'
Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
Almost no reactionAlmost no reaction
Almost no reaction
DI-142
- DIAGNOSTICSENGINE
335 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
The narrowing down the trouble area is possible by performing ACTIVE TEST of the following ºA/F CON-
TROLº (Heated oxygen sensor or another can be distinguished).
(a) Perform ACTIVE TEST by hand-held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine with the engine speed at 2,500 rpm for approximately 90 seconds.
(4) Select the item ºDIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROLº.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press the right or left button).
RESULT:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
+25 % " rich output: More than 0.5 V
-12.5 % " lean output: Less than 0.4 V
NOTICE:
However, there is a few seconds delay in the sensor 1 (front sensor) output. And there is about 20
seconds delay in the sensor 2 (rear sensor).
Page 1192 of 3115
- DIAGNOSTICSENGINE
DI-143
336 Author: Date:
2004 LAND CRUISER (RM1071U)
The following A/F CONTROL procedure enables the technician to check and graph the voltage output of
the heated oxygen sensors.
For displaying the graph indication, first enter ºACTIVE TEST / A/F CONTROL / USER DATA,º then select
º02S B1S1and O2S B1S2º by pressing ºYESº button, and push ºENTERº button before pressing ºF4º button.
HINT:
If different DTCs that are related to different system are output simultaneously while terminal E2 is used
as a ground terminal, terminal E2 may be open.
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.
1 Are there any other codes (besides DTC P0136 or P0156) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD ll scan tool.
RESULT:
Display (DTC Output)Proceed to
P0136A
ºP0136º and other DTCsB
HINT:
If any other codes besides P0136 are output, perform the troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI-36).
A