1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 1185 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 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 pag

Page 1186 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - 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 (b

Page 1187 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 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)

Page 1188 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - 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
(

Page 1189 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 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 (Outp

Page 1190 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A20316
Vehicle speed
40 km/h
(25 mph)
IG SW OFFOnce
40 sec.
or more
60 sec.
or more10 sec.Twice
40 sec.
or more12 times
40 sec.
or more
10 sec. 10 sec.
(1)(3)
(4)
Idling(2)(3)
(4)(3)
(4)
- DIA

Page 1191 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
'
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

TOYOTA LAND CRUISER 1998 Factory Repair Manual - 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 senso

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