1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 1153 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-104
- DIAGNOSTICSENGINE
297 Author: Date:
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions wh

Page 1154 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-105
298 Author: Date:
3 Check thermostat (See page CO-12).
NG Replace thermostat.
OK
Replace ECM (See page SF-60).

Page 1155 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-106
- DIAGNOSTICSENGINE
299 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1)
DTC P0150 Oxygen Sensor Circuit (Bank 2 Sensor 1)
DTC P2195 Oxygen Sensor

Page 1156 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A20806
Rich
Lean 0.55
0.45
0.40
Oxygen sensor output voltage (V)
PASS
FAILFAIL
FAIL
Pass / Fail definition of voltage malfunction
Time
- DIAGNOSTICSENGINE
DI-107
300 Author: Date:
2004 LAND CRUISER

A20806
Rich
Lean 0.55
0.45
0.40
Oxygen sensor output voltage (V)
PASS
FAILFAIL
FAIL
Pass / Fail definition of voltage malfunction
Time
- DIAGNOSTICSENGINE
DI-107
300 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 gas. 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
output voltage between 0 V and 1.0 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 0.4 V or less, the ECM judges that the air-fuel ratio is LEAN.
Under normal condition, the output voltage from the heated oxygen sensor alternates RICH and LEAN sides
periodically. If the heated oxygen sensor outputs RICH signal (or LEAN signal) constantly, or if the heated
oxygen sensor cannot output enough voltage to reach the minimum specification, the ECM interprets this
as a malfunction in the heated oxygen sensor and sets a DTC.
MONITOR STRATEGY
P0130Front heated oxygen sensor voltage is constant
at lean side or rich side (Bank 1)
P0150Front heated oxygen sensor voltage is constant
at lean side or rich side (Bank 2)
P2195Front heated oxygen sensor voltage is constant
at lean side (Bank 1)
Related DTCs
P2196Front heated oxygen sensor voltage is constant
at rich side (Bank 1)
P2197Front heated oxygen sensor voltage is constant
at lean side (Bank 2)
P2198Front heated oxygen sensor voltage is constant
at rich side (Bank 2)
Rid / tMain sensors/componentsFront heated oxygen senorRequired sensors/componentsRelated sensors/componentsCrank position sensor, Vehicle speed sensor
Frequency of operationOnce per drive cycle
Duration20 to 36 sec. x (3 times)
MIL operation2 driving cycles
Sequence of operationNone

Page 1157 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-108
- DIAGNOSTICSENGINE
301 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not pr

Page 1158 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A20314
Vehicle speed
40 km/h
(25 mph)
Ignition OFF
(a) (b)120 sec.
or more(d)
20 sec.
or more 20 sec.
or more20 sec.
or more20 sec.
or more
20 sec.
or more30 sec. (e)
(f) Idling (c)(d)
(d)
(e)
- DIAG

Page 1159 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual +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 oxyg

+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
Almost no reaction
'
Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
Almost no reaction Almost no reaction
DI-1 10
- DIAGNOSTICSENGINE
303 Author: Date:
2004 LAND CRUISER (RM1071U)
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).
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.
NOTICE:
If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and heated oxygen sensor DTCs will
be recorded, and the MIL then comes on.
HINT:
If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, 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.

Page 1160 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-1 11
304 Author: Date:
2004 LAND CRUISER (RM1071U)
1 Are there any other codes (besides DTC P0130, P0150, P2195, P2197, P2196 or
P2198) being output?
PREPARATION:
(a) Connec

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