TOYOTA LAND CRUISER 1998 Factory Repair Manual
Page 1161 of 3115
Q30018
DI-1 12
- DIAGNOSTICSENGINE
305 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check output voltage of heated oxygen sensor during idling.
PREPARATION:
(a) Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for approximately 90 seconds.
(b) Connect the hand-held tester or OBD II scan tool to the DLC3.
(c) When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / O2S B1 S1 or B2 S1.
CHECK:
Check the output voltage of the heated oxygen sensor during idling the OBD II scan tool or hand-held tester.
OK:
Heated oxygen sensor output voltage:
Alternates repeatedly between less than 0.4 V and more than 0.5 V (See the following table).
OK Go to step 9.
NG
Page 1162 of 3115
A20870
E1 +B
OX
+BHT
OX E1HT H5
H7
H6
H8
Components Side:
Bank1 Sensor1, Bank2 Sensor1
Bank1 Sensor2, Bank2 Sensor2
A21543
1
23
4 EFI or ECD Relay
- DIAGNOSTICSENGINE
DI-1 13
306 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check resistance of heated oxygen sensor heater.
PREPARATION:
Disconnect the H5, H6, H7 or H8 heated oxygen sensor con-
nector.
CHECK:
Measure resistance between terminals of the heated oxygen
sensor.
OK:
Tester ConnectionSpecified Condition
HT (H5-1) - +B (H5-2)11 to 16 W (20°C)
HT (H6-1) - +B (H6-2)11 to 16 W (20°C)
HT (H7-1) - +B (H7-2)11 to 16 W (20°C)
HT (H8-1) - +B (H8-2)11 to 16 W (20°C)
NG Replace heated oxygen sensor.
OK
4 Check EFI or ECD relay.
PREPARATION:
Remove the EFI or ECD relay from the engine room R/B.
CHECK:
Inspect the EFI or ECD relay.
OK:
Terminal No.ConditionSpecified Condition
2 - 4ConstantContinuity
UsuallyNo Continuity
1 - 3Apply B+ between
terminals 2 and 4Continuity
NG Replace EFI or ECD relay.
OK
Page 1163 of 3115
A20870
E1 +B
OX
+BHT
OX E1HT H5
H7
H6
H8
Components Side:
Bank1 Sensor1, Bank2 Sensor1
Bank1 Sensor2, Bank2 Sensor2
A21340ECM Connector HT1BHT1AOX1A
OX2A
HT2B
HT2AOX1B E6
OX2B
DI-1 14
- DIAGNOSTICSENGINE
307 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check for open and short in harness and connector between ECM and heated
oxygen sensor.
PREPARATION:
(a) Disconnect the H5, H6, H7 or H8 heated oxygen sensor
connector.
(b) Disconnect the E6 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
OX (H5-3) - OX1A (E6-23)Below 1 W
HT (H5-1) - HT1A (E6-4)Below 1 W
OX (H6-3) - OX1B (E6-29)Below 1 W
HT (H6-1) - HT1B (E6-5)Below 1 W
OX (H7-3) - OX2A (E6-22)Below 1 W
HT (H7-1) - HT2A (E6-33)Below 1 W
OX (H8-3) - OX2B (E6-21)Below 1 W
HT (H8-1) - HT2B (E6-25)Below 1 W
OX (H5-3) or OX1A (E6-23) -
Body ground10 kW or higher
HT (H5-1) or HT1A (E6-4) -
Body ground10 kW or higher
OX (H6-3) or OX1B (E6-29) -
Body ground10 kW or higher
HT (H6-1) or HT1B (E6-5) -
Body ground10 kW or higher
OX (H7-3) or OX2A (E6-22) -
Body ground10 kW or higher
HT (H7-1) or HT2A (E6-33) -
Body ground10 kW or higher
OX (H8-3) or OX2B (E6-21) -
Body ground10 kW or higher
HT (H8-1) or HT2B (E6-25) -
Body ground10 kW or higher
Page 1164 of 3115
A21040
Reference (Bank 1 Sensor 1 System Drawing)
From
BatteryEFI or ECD
No. 1 FuseEFI or ECD
RelayEFI or ECD
No. 2 FuseHeater Oxygen
Sensor
Heater
SensorHT1A
OX1A
E2
MRELECM
- DIAGNOSTICSENGINE
DI-1 15
308 Author: Date:
2004 LAND CRUISER (RM1071U)
NG Repair or replace harness or connector.
OK
6 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
7 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
Page 1165 of 3115
DI-1 16
- DIAGNOSTICSENGINE
309 Author: Date:
2004 LAND CRUISER (RM1071U)
8 Check injector injection (See page SF-24).
NG Replace injector.
OK
Replace heated oxygen sensor.
9 Perform confirmation driving pattern.
HINT:
Clear all DTCs prior to performing the confirmation driving pattern.
Go
10 Is there DTC P0130, P0150, P2195, P2196, P2197 or P2198 being output again?
NO Check for intermittent problems
(See page DI-3).
YES
Replace ECM (See page SF-60).
Page 1166 of 3115
- DIAGNOSTICSENGINE
DI-1 17
310 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0133 Oxygen Sensor Circuit Slow Response
(Bank 1 Sensor 1)
DTC P0153 Oxygen Sensor Circuit Slow Response
(Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0031 on page DI-49.
DTC No.DTC Detecting ConditionTrouble Area
P0133
P0153
After engine has been warmed up, if response time that heated
oxygen sensor's output voltage reaches from RICH to LEAN,
or from LEAN to RICH, is 0.6 seconds or more during idling.
(2 trip detection logic)Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Ai i d ti tP0153If response time of heated oxygen sensor's output voltage in
one RICH-LEAN cycle is 5.6 seconds or more during idling.
(2 trip detection logic)Air induction system
Fuel pressure
Injector
ECM
HINT:
Bank 1 refers to bank that includes cylinder No. 1.
Bank 2 refers to bank that does not includes cylinder No. 1.
Sensor 1 refers to the sensor closer to the engine assembly.
DIC27-01
Page 1167 of 3115
A20599
0.55
0.40
Oxygen sensor output voltage (V)
Lean to Rich / Rich to Lean time definition
Time Lean to Rich time Rich to Lean time
Rich
Lean Slow slope condition
A20600
Frequency Condition
One Cycle
Rich side frequency
Lean side frequency O2 Sensor Voltage
0.45 V DI-1 18
- DIAGNOSTICSENGINE
311 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio close to a stoichiometric
ratio. This maximizes the catalytic converter's ability to purify the exhaust gases. The sensor detects oxygen
levels in the exhaust gas and sends this signal to the ECM.
The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element
is exposed to exhaust gas. The sensor element is made of platinum coated zirconia and includes an inte-
grated heating element. The heated oxygen sensor has the characteristic whereby its output voltage
changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates
waveforms of a voltage between 0 V and 1 V in response to the oxygen concentration in exhaust gas. When
the output voltage of the heated oxygen sensor is 0.55 V or more, the ECM judges that the air-fuel ratio is
RICH. When it is 0.40 V or less, the ECM judges that the air-fuel ratio is LEAN.
The ECM monitors the response feature of the heated oxygen sensor. If the response time of the heated
oxygen sensor output status change from RICH to LEAN or vice versa becomes longer, the ECM interprets
this as a malfunction in the heated oxygen sensor and sets a DTC.
Page 1168 of 3115
- DIAGNOSTICSENGINE
DI-1 19
312 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
RltdDTC
P0133Front heated oxygen sensor response monitor
(Bank 1)
Related DTCs
P0153Front heated oxygen sensor response monitor
(Bank 2)
Main sensors/componentsFront heated oxygen sensor
Required sensors/componentsRelated sensors/componentsCrank position sensor, Vehicle speed sensor,
Mass air flow meter
Frequency of operationOnce per drive cycle
DurationWithin 60 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)
Frequency idle condition:
There is history that the following condi-
tions were met for 20 sec.A and B
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
IdleON
Vehicle speed-5 km/h (3 mph)
Fuel system statusClosed loop
Time after engine start120 sec.-
Engine coolant temperature40°C (104°F)-
Frequency cruise condition:
There is history that the following condi-
tions were met for 20 sec.A and B
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
Intake air amount3 g/sec.13 g/sec.
Time after engine start120 sec.-
IdleOFF
Fuel system statusClosed loop
Engine speed1,000 rpm3,500 rpm
Engine coolant temperature70°C (158°F)-
Slow slope condition:
Both of the following condition were met
for 20 sec.A and B
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
Time after engine start120 sec.-
IdleON
Vehicle speed-5 km/h (3 mph)
Page 1169 of 3115
DI-120
- DIAGNOSTICSENGINE
313 Author: Date:
2004 LAND CRUISER (RM1071U) Fuel system status
Closed loop
Engine coolant temperature40°C (104°F)-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Frequency idle condition
Time required by the sensor's output voltage to change in
one RICH-LEAN cycle5.6 sec. or more
Frequency cruise condition
Time required by the sensor's output voltage to change in
one RICH-LEAN cyclea specific time or more
Slow slope condition
Both of the following conditions were metA and B
A. Number of judgment made3 times
B. Following conditions were met(a) or (b)
(a) Average lean to rich response time0.9 sec. or more
(b) Average rich to lean response time0.9 sec. or more
COMPONENT OPERATING RANGE
ParameterStandard value
Voltage output from heated oxygen sensorQuickly fluctuates between 0.4 and 0.55 V
O2S TEST RESULT
Refer to page DI-3 for detailed information.
Front HO2S slow slope 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
$03
(Test constant)
Low sensor voltage for response
time calculation
N/AV
$04
(Test constant)
High sensor voltage for response
time calculation
N/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 (0.55 V)N/Asec.
$32Time to change from Rich (0.55
V) to Lean (0.4 V)N/Asec.
Front HO2S frequency monitor (idling)
If the $38 is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$38
Response time of heated oxygen
sensor's output voltage in one
RICH-LEAN cycle
N/Asec.
Page 1170 of 3115
- DIAGNOSTICSENGINE
DI-121
314 Author: Date:
2004 LAND CRUISER (RM1071U)
Front HO2S frequency monitor (cruse)
If the $90 is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$90
Remained value of that average of
switching frequency is subtracted
from average of switching frequen-
cy threshold
Multiply by 0.04096 plus 5.2sec.
WIRING DIAGRAM
Refer to DTC P0031 on page DI-49.
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 second delay in the sensor 1 (front sensor) output. And there is about 20 se-
conds delay in the sensor 2 (rear sensor).