engine TOYOTA HIGHLANDER 2001 Service Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: HIGHLANDER, Model: TOYOTA HIGHLANDER 2001Pages: 2572, PDF Size: 34.8 MB
Page 1694 of 2572
05-120
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
310 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever these DTCs are not presentSee page 05-16
P0136 (Rear HO2S output voltage - case 1):
All of the following conditions are met:Conditions 1, 2, 3 and 4
1. Malfunction determination in this driving cycleNot detected
2. EngineRunning
3. Time after engine start0 second or more
4. Either of the following conditions is met:Conditions (a) or (b)
(a) Cumulative time while HO2S heater is operating22 seconds or more
(b) HO2S voltageHas reached to 0.2 V or more
P0136 (Rear HO2S output voltage - case 2):
EngineRunning
P0136 (Rear HO2S low impedance):
Battery voltage11 V or more
Estimated HO2S temperatureLess than 700C (1,292F)
ECM monitorCompleted
P0606Not set
P0137 (Rear HO2S high impedance):
Battery voltage11 V or more
Estimated HO2S temperature450C (842F) or higher
ECM monitorCompleted
P0606Not set
P0138 (Rear HO2S output voltage - case 3):
Battery voltage11 V or more
Time after engine start2 seconds or more
P0138 (Rear HO2S output voltage during fuel-cut):
Engine coolant temperature70C (158F) or more
Catalyst temperature400C (752F) or more
Fuel-cutExecuting
TYPICAL MALFUNCTION THRESHOLDS
P0136 (Rear HO2S output voltage - case 1):
Both of the following conditions are met:Conditions 1 and 2
1. Frequency that HO2S voltage changes between (a) and
(b)0 time
(a) Maximum voltage0.6 V or more
(b) Minimum voltageLess than 0.45 V
2. Cumulative monitor time *1
of rear HO2S320 seconds or more
*1: Monitor time is counted when all of the following condi-
tions are met:Conditions (a) and (b)
(a) Fuel system statusClosed-loop
(b) IdleOFF
P0136 (Rear HO2S output voltage - case 2):
All of the following conditions are met:Conditions 1, 2, 3, 4 and 5
1. Cumulative monitor time *2
of HO2S220 seconds or more
2. Duration while HO2S voltage is below 0.05 V132 seconds or more
3. Duration while HO2S voltage is higher than 0.7 VLess than 44 seconds
4. Duration while HO2S voltage is 0.45 V to 0.7 VLess than 88 seconds
5. Duration while HO2S voltage is 0.45 V or moreLess than 20 seconds
Page 1697 of 2572
A90296
MRELOX1B
31HT1BECM
FL
Main
BatteryEngine
Room R/B
No. 2
J2
J/C W-B B-W
4H10
Heated Oxygen Sensor
BR
BR A
A 1
12D
EFI
Relay35
2 2
5
31Engine
Room
J/BB
EEE5 E8
E8
8 21
29
2
O1B- Shielded
E91
E1 ABR J7
J/CE8
ABR
EH F7
FL
Block
AssyW
W22
EFI
NO. 2
2B
2F 2I EFI
NO. 12
IM13
IM16
IM1R-Y
G
R
B P-LW B-R
GR
Y2 1
34
13
IK3
IM1 4 IM1
EB15
1
R HT
OX
E +B
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-123
313 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
Page 1698 of 2572
A58686
Vehicle speed
60 km/h
(38 mph)
Ignition Switch OFFOnce
40 seconds
or more
Warm up
(engine coolant
temperature
is more than 75C (167F)) 10 seconds
or moreTwice
40 seconds
or more12 times
40 seconds
or more
(a), (b)(d)
(e)
Idling (c)(d)
(e)(d)
(f)
10 seconds
or more10 seconds
or more 05-124
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
314 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CONFIRMATION DRIVING PATTERN (P0136)
(a) Connect the hand-held tester to the DLC3.
(b) Switch the hand-held tester from normal mode to check (test) mode (see page 05-40).
(c) Start the engine and warm it up until the engine coolant temperature becomes more than 75C.
(d) Drive the vehicle at 60 km/h (38 mph) or more for 40 seconds or more.
(e) Let the engine idle for 10 seconds or more.
(f) Perform steps (d) to (e) 12 times.
HINT:
If a malfunction exists, the MIL will illuminate during step (f).
NOTICE:
If the conditions in this test are not strictly followed, detection of a malfunction will not occur. If you
do not have a hand-held tester, turn the ignition switch OFF after performing steps from (c) to (f), then
perform steps from (c) to (f) again.
CONFIRMATION DRIVING PATTERN (P0137)
Warm up the engine and run the engine at 60 km/h (38 mph) for 7 minutes.
CONFIRMATION DRIVING PATTERN (P0138)
Warm up the engine and run the engine at idle for 30 seconds.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The
A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble
areas are malfunctioning or not.
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
(4) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine idle (press the right or left button).
Page 1699 of 2572
+25 %
-12.5 %
More than 3.35 V
Less than 3.0 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2)Main suspect
trouble area
OK
+25 %
-12.5 %
More than 3.35 V
Less than 3.0V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
A/F sensor
(A/F sensor, heater, A/F sen-
sor circuit)
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
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 actual
air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost
No reaction
Almost
No reaction
Almost
No reaction Almost
No reaction
'
Heated oxygen sensor
(heated oxygen sensor,
heater, heated oxygen sensor
circuit)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-125
315 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Result:
A/F sensor reacts in accordance with increase and decrease of injection volume:
+25 % " rich output: Less than 3.0 V
-12.5 % " lean output: More than 3.35 V
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 % " rich output: More than 0.55 V
-12.5 % " lean output: Less than 0.4 V
NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay at maximum.
The following A/F CONTROL procedure enables a technician to check and graph the voltage outputs of both
the A/F sensor and the heated oxygen sensor.
For displaying the graph, enter ºACTIVE TEST / A/F CONTROL / USER DATAº, select ºAFS B1S1 and O2S
B1S2º by pressing ºYESº and push ºENTERº. Then press ºF4º.
HINT:
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, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, and other data from the time the malfunction occurred.
Page 1700 of 2572
A81695
E8
ECM
O1B-
OX1B
HT1B
05-126
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
316 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
1 CHECK OTHER DTC OUTPUT
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
Display (DTC Output)Proceed to
P0138 is outputA
P0137 is outputB
P0136 is outputC
HINT:
If any other codes besides P0136, P0137 and/or P138 are output, perform the troubleshooting for those
codes first.
B Go to step 9
C Go to step 6
A
2 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (OUTPUT
VOLTAGE OF HEATED OXYGEN SENSOR)
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn ON the ignition switch. Push the hand-held tester or the OBD II scan tool main switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1S2.
(d) Run the engine at idle.
(e) Read the output voltage of the heated oxygen sensor during idling.
Heated oxygen sensor output voltageProceed to
More than 1.2 VA
Less than 1.0 VB
B READ OUTPUT DTC
A
3 CHECK WIRE HARNESS (CHECK FOR SHORT)
(a) Turn the ignition switch OFF and wait for 5 minutes.
(b) Disconnect the E8 ECM connector.
(c) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
E8-21 (HT1B) - E8-29 (OX1B)10 kW or higher
E8-21 (HT1B) - E8-2 (O1B-)10 kW or higher
OK REPLACE ECM (See page 10-9)
NG
Page 1701 of 2572
A80018
H10
Heated Oxygen Sensor
E1 OX
+B
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-127
317 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)
(a) Disconnect the H10 heated oxygen sensor connector.
(b) Measure the resistance of the sensor side connectors.
Standard:
Tester ConnectionSpecified Condition
H10-1 (+B) - H10-3 (E1)10 kW or higher
H10-1 (+B) - H10-4 (OX)10 kW or higher
OK REPAIR OR REPLACE HARNESS AND
CONNECTOR
NG
REPLACE HEATED OXYGEN SENSOR
5 READ OUTPUT DTC (CHECK MODE)
(a) Change the ECM to check mode with the hand-held tester.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / CHECK MODE.
(b) Warm up the engine and drive the vehicle at over 25 mph (40 km/h) for an accumulated total of 10
minutes.
HINT:
The 10 minutes of driving should be driven in one instance, but it is not necessary to maintain a speed of
25 mph (40 km/h) for 10 minutes consecutively.
(c) Read the DTC.
Result:
Display (DTC output)Proceed to
P0136 is outputA
No DTCB
B CHECK FOR INTERMITTENT PROBLEMS
(See page 05-9)
A
REPLACE HEATED OXYGEN SENSOR
6 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (OUTPUT
VOLTAGE OF HEATED OXYGEN SENSOR)
(a) After warming up the engine, run the engine at 2,500 rpm for 3 minutes.
(b) Read the output voltage of the heated oxygen sensor when the engine rpm is suddenly increased.
HINT:
Quickly accelerate the engine to 4,000 rpm 3 times by using the accelerator pedal.
Heated oxygen sensor output voltage: Alternates 0.4 V or less and 0.5 V or more.
OK Go to step 10
NG
Page 1702 of 2572
A80018
H10
Heated Oxygen Sensor
+B HT
E1 OX
B60778
5
12 312
5
3
05-128
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
318 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
(a) Disconnect the H10 heated oxygen sensor connector.
(b) Measure the resistance of the heated oxygen sensor ter-
minals.
Standard:
Tester ConnectionConditionSpecified Condition
H10-1 (+B) - H10-2 (HT)20C (68F)11 to 16 W
H10-1 (+B) - H10-2 (HT)800C (1,472F)23 to 32 W
NG REPLACE HEATED OXYGEN SENSOR
OK
8 INSPECT RELAY (EFI)
(a) Remove the EFI relay from the engine room J/B.
(b) Measure the resistance of the EFI relay.
Standard:
Tester ConnectionSpecified Condition
3 - 510 kW or higher
3 - 5Below 1 W
(when battery voltage is applied to terminals 1 and 2)
NG REPLACE RELAY
OK
Page 1705 of 2572
A87979
+12.5 %
Normal Malfunction-12.5 %
0 3.3 V
1 VA/F Sensor Output
Heated Oxygen Sensor OutputInjection Volume
Malfunction
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-131
321 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
15 PERFORM ACTIVE TEST USING HAND-HELD TESTER
(a) Start the engine and warm it up.
(b) Connect the hand-held tester to the DLC3.
(c) Turn ON the ignition switch and the hand-held tester main switch.
(d) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INJ VOL.
(e) Using the hand-held tester, change the injection volume to check the A/F sensor output and heated
oxygen sensor output values below.
HINT:
Change the injection volume from -12.5 % to +12.5 %.
Result:
A/F sensor output remains more than 3.3 V or A/F sensor output remains less than 3.3 V
(Heated oxygen sensor reacts in accordance with increase and decrease of injection volume)
OK REPLACE AIR FUEL RATIO SENSOR
NG
CHECK AND REPLACE EXTREMLY RICH OR LEAN ACTUAL AIR FUEL RATIO (INJECTOR, FUEL
PRESSURE, GAS LEAKAGE IN EXHAUST SYSTEM, ETC.)
Page 1706 of 2572
05-132
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
322 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0171 SYSTEM TOO LEAN (BANK 1)
DTC P0172 SYSTEM TOO RICH (BANK 1)
CIRCUIT DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim in-
cludes the short-term fuel trim and the long-term fuel trim.
The short-term fuel trim is the short-term fuel compensation used to maintain the ideal stoichiometric air-
fuel ratio. The signal from the A/F sensor indicates whether the air-fuel ratio is RICH or LEAN compared
to the stoichiometric air-fuel ratio. This variance triggers a reduction in the fuel volume if the air-fuel ratio
is RICH, and an increase in the fuel volume if it is LEAN.
The short-term fuel trim varies from the central value due to individual engine differences, wear over time
and changes in the operating environment. The long-term fuel trim, which controls overall fuel compensa-
tion, steadies long-term deviations of the short-term fuel trim from the central value.
If both the short-term fuel trim and the long-term fuel trim are LEAN or RICH beyond a certain value, it is
detected as a malfunction, the MIL is illuminated and a DTC is set.
DTC No.DTC Detection ConditionTrouble Area
P0171
When air-fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on LEAN side
(2 trip detection logic)
Air induction system
Injector blockage
MAF meter
ECT sensor
Fuel pressure
Gas leakage in exhaust system
Open or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
A/F sensor heater (bank 1 sensor 1)
EFI relay
Open or short in A/F sensor heater and EFI relay circuits
PCV hose connection
PCV hose
P0172
When air-fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on RICH side
(2 trip detection logic)
Injector leak, blockage
MAF meter
ECT sensor
Ignition system
Fuel pressure
Gas leakage in exhaust system
Open or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
A/F sensor heater
Open or short in A/F sensor heater and EFI relay circuits
EFI relay
HINT:
When DTC P0171 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 is re-
corded, the actual air-fuel ratio is on the RICH side.
If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 is recorded. The MIL then illumi-
nates.
05ETQ-06
Page 1708 of 2572
05-134
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
324 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
Fuel system statusClosed Loop
Battery voltage11 V or more
Throttle position learningCompleted
Either of the following conditions is met:Condition 1 or 2
1. Engine RPMLess than 1,100 rpm
2. Intake air amount per revolution0.22 g/rev or more
TYPICAL MALFUNCTION THRESHOLDS
Purge-cutExcecuting
Either of the following conditions is met:Condition 1 or 2
1. Average between short-term fuel trim and long-term fuel
trim34% or more (varies with ECT)
2. Average between short-term fuel trim and long-term fuel
trim-34% or less (varies with ECT)
WIRING DIAGRAM
Refer to DTC P2195 on page 05-269.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The
A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble
areas are malfunctioning or not.
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume by 12.5 % or increases the injection volume by
25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
(4) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine idling (press the right or left button).
Result:
A/F sensor reacts in accordance with increase and decrease of injection volume:
+25 % " RICH output: Less than 3.0 V
-12.5 % " LEAN output: More than 3.35 V
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 % " RICH output: More than 0.55 V
-12.5 % " LEAN output: Less than 0.4 V