2001 TOYOTA HIGHLANDER coolant temperature
[x] Cancel search: coolant temperaturePage 1688 of 2572
05-1 14
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
304 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, engine coolant tempera-
ture sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118
first.
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 determine 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.
1 CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0125)
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
Display (DTC Output)Proceed to
Only P0125 are outputA
P0125 and other DTCs are outputB
HINT:
If any other codes besides P0125 is output, perform the troubleshooting for those codes first.
B GO TO RELEVANT DTC CHART
(See page 05-48)
A
2 INSPECT THERMOSTAT (See page 16-2)
(a) Check the valve opening temperature of the thermostat.
OK:
Valve opening temperature: 80 to 84C (176 to 183F)
HINT:
Also check that the valve is completely closed under opening temperature as above.
NG REPLACE THERMOSTAT (See page 16-1 1)
OK
3 CHECK COOLING SYSTEM
(a) Check the cooling system for excessive cooling, such as abnormal radiator fan operation, modified
cooling system and other defects.
OK:
There is no modification of cooling system.
NG REPAIR OR REPLACE COOLING SYSTEM
OK
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
Page 1689 of 2572
A82385
ECTEstimated ECT
Threshold
(75C (167F))5 seconds
Indicated coolant temperature reading
Time
DTC set (after 2 driving cycles)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 15
305 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0128 COOLANT THERMOSTAT (COOLANT
TEMPERATURE BELOW THERMOSTAT
REGULATING TEMPERATURE)
CIRCUIT DESCRIPTION
This DTC is output when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite suffi-
cient engine warm-up time.
DTC No.DTC Detection ConditionTrouble Area
P0128
Conditions (a), (b) and (c) are met:
(a) Cold start
(b) Sufficient warm-up time has elapsed
(c) ECT is less than 75°C (167°F)Thermostat
Cooling system
ECT sensor
ECM
MONITOR DESCRIPTION
The ECM estimates the coolant temperature based on starting temperature, engine loads, and engine
speeds. The ECM then compares the estimated temperature with the actual ECT. When the estimated cool-
ant temperature reaches 75C (167F), the ECM checks the actual ECT. If the actual ECT is less than 75C
(167F), the ECM will interpret this as a fault in the thermostat or the engine cooling system and set a DTC.
05ETK-05
Page 1693 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 19
309 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
Following condition (a) (b) or (c) is met:
(a) During driving with engine warmed up, heated oxygen sen-
sor output does not change for 8 minutes
(b) Heated oxygen sensor output is very low most of time for
Open or short in heated oxygen sensor (bank 1 sensor 2)
ii
P0136
(b) Heated oxygen sensor out ut is very low most of time for
220 seconds
(c) The rear heated oxygen sensor voltage does not drop to
below 0.2 V immediately when vehicle decelerates and fuel
cut is operatingcircuit
Heated oxygen sensor (bank 1 sensor 2)
Heated oxygen sensor heater (bank 1 sensor 2)
A/F sensor
A/F sensor heatercut is o erating
Both (a) and (b) continue for more than 30 seconds:
(a) Estimated rear oxygen sensor temperature is less than
800C
(b) Rear oxygen sensor impedance is less than 5WA/F sensor heater
EFI relay
P0137
Both (a) and (b) continue for more than 240 seconds:
(a) Estimated rear oxygen sensor temperature is more than
450C
(b) Rear oxygen sensor impedance is more than 15kWOpen or short in heated oxygen sensor (bank 1 sensor 2)
circuit (sensor to ECM)
Open or short in heated oxygen sensor (bank 1 sensor 2)
internal
P0138Rear oxygen sensor output voltage is over 1.2 V for more than
30 secondsShort in heated oxygen sensor (bank 1 sensor 2) circuit
Short in heated oxygen sensor (bank 1 sensor 2) circuit
ECM internal circuit malfunction
MONITOR DESCRIPTION
The ECM monitors the rear heated oxygen sensor (HO2S) in the following 4 items:
1. The HO2S voltage changes between Rich (more than 0.45 V) and Lean (less than 0.45 V) while the vehicle
is running (repeating acceleration and deceleration) for 8 minutes. If not, the ECM interprets this as a mal-
function, illuminates the MIL, and then sets a DTC.
2. The HO2S voltage does not remain at less than 0.05 V for a long time while the vehicle is running (60 %
of the time in the 220 second-monitor, the sensor output is less than 0.05 V). If it does, the ECM interprets
this as a malfunction, illuminates the MIL, and then sets a DTC.
3. The sensor's voltage drops to below 0.2 V (extremely Lean status) immediately when the vehicle deceler-
ates and the fuel cut is working for 7 seconds. If not, the ECM interprets this to mean the sensor's response
feature has deteriorated, illuminates the MIL, and then sets a DTC.
4. The rear oxygen sensor impedance is 5 W or less, 15 kW or more, or output voltage is 1.2 V or more (normal
voltage: 0 to 1.0 V). If so, the ECM will determine that the rear oxygen sensor or a related circuit has an open
or short circuit, illuminates the MIL and sets a DTC.
Impedance is detected by the IC inside the ECM.
MONITOR STRATEGY
Related DTCs
P0136: Heated oxygen sensor output voltage (Output voltage)
P0136: Heated oxygen sensor impedance (Low impedance)
P0137: Heated oxygen sensor impedance (High impedance)
P0138: Heated oxygen sensor output voltage (High voltage)
P0138: Heated oxygen sensor output voltage (During fuel-cut)
Required Sensors/Components (Main)Heated oxygen sensor
Required Sensors/Components (Related)Crankshaft position sensor, engine coolant temperature sensor, mass air flow me-
ter and throttle position sensor
Frequency of OperationOnce per driving cycle: Active air-fuel ratio control detection
Continuous: Others
DurationWithin 480 seconds
MIL Operation
2 driving cycles: P0136 (Rear HO2S output voltage - case 1)
P0136 (Rear HO2S output voltage - case 2)
P0138 (Rear HO2S voltage during fuel-cut)
Immediate: Others
Sequence of OperationNone
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 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 1712 of 2572
S01196S01699
30
20
10
5
3
02040 0.11
0.3
0.2 0.52
60 80 100 -20
(-4) (104) (140) (176)(32) (68) (212)
A81700
Ohmmeter
Acceptable
Temperature C (F)
Resistance kW
05-138
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
328 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 INSPECT ENGINE COOLANT TEMPERATURE SENSOR (RESISTANCE)
(a) Remove the ECT sensor.
(b) Measure the resistance of the ECT sensor terminals.
Standard:
Tester ConnectionConditionSpecified Condition
1 - 220C (68F)2.32 to 2.59 kW
1 - 280C (176F)0.310 to 0.326 kW
NOTICE:
When checking the ECT sensor in water, be careful not to
allow water to go into the terminals. After the check, dry the
sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed
ECT sensor and read the resistance. Use an infrared thermom-
eter to measure the engine temperature in the immediate vicin-
ity of the sensor. Compare these values to the resistance/tem-
perature graph. Change the engine temperature (warm up or
allow to cool down) and repeat the test.
NG REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
OK
6 CHECK FOR SPARK AND IGNITION (See page 18-1)
OK: Spark occurs.
NG REPAIR OR REPLACE
OK
7 CHECK FUEL PRESSURE (See page 11-4)
(a) Check the fuel pressure (high or low pressure).
Standard:
ItemSpecified Condition
Fuel pressure304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 55 psi)
NG REPLACE FUEL SYSTEM
OK
Page 1722 of 2572
05-148
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
338 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCs
P0300: Multiple cylinder misfire
P0301: cylinder 1 misfire
P0302: cylinder 2 misfire
P0303: cylinder 3 misfire
P0304: cylinder 4 misfire
Required sensors / components (Main)Injector, ignition coil, spark plug
Required sensors / components (Related)CKP, CMP, ECT, IAT and MAF meter
Frequency of operationContinuous
Duration1,000 revolutions: Emission-related-misfire
200 revolutions: Catalyst-damaged-misfire
MIL operation2 driving cycles (MIL flashes immediately when Catalyst-damaged-misfire occurs)
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever these DTCs are not presentSee page 05-16
Battery voltage8 V or more
Throttle position learningCompleted
VVT systemNot operated by scan tool
Engine RPM400 to 6,200 rpm
All of the following conditions are met:Condition 1 and 2
1. Engine Coolant Temperature (ECT)-10C (14F) or more
2. Either of the following conditions is met:Condition (a) or (b)
(a) ECT at engine startMore than -7C (19.4F)
(b) ECTMore than 20C (68F)
Fuel-cutOFF
Monitor Period of Emission-related-misfire:
First 1,000 revolutions after engine start, or check modeCrankshaft 1,000 revolutions
Except aboveCrankshaft 1,000 revolutions y 4
Monitor Period of Catalyst-damage-misfire (MIL blinks):
All of the following conditions 1, 2 and 3 met:Crankshaft 200 revolutions
1. Driving cycles1st
2. Check ModeOFF
3. Engine RPMLess than 3,800 rpm
Except aboveCrankshaft 200 revolutions x 3
TYPICAL MALFUNCTION THRESHOLDS
Monitor Period of Emission-related-misfire:
Misfire rate4.0 % or more
Monitor Period of Catalyst-damage-misfire (MIL blinks):
Number of misfire per 200 revolutions129 or more (varies with intake air amount and engine RPM)
Page 1733 of 2572
S01196S01699
30
20
10
5
3
02040 0.11
0.3
0.2 0.52
60 80 100 -20
(-4) (104) (140) (176)(32) (68) (212)
A81700
Ohmmeter
Acceptable
Temperature C (F)
Resistance kW
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-159
349 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
17 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (INTAKE AIR
TEMPERATURE AND MASS AIR FLOW RATE)
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON.
(c) Check the intake air temperature.
(1) On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / EN-
HANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read the values.
Temperature: Equivalent to ambient temperature
(d) Check the air flow rate.
(1) On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / EN-
HANCED OBD II / DATA LIST / ALL / MAF. Read the values.
Standard:
ConditionAir Flow Rate (gm/s)
Ignition switch ON (do not start engine)0
Idling0.5 to 5
Running without load (2,500 rpm)3 to 10
Idling to quickly acceleratingAir flow rate fluctuates
NG REPLACE MASS AIR FLOW METER
OK
18 INSPECT ENGINE COOLANT TEMPERATURE SENSOR (RESISTANCE)
(a) Remove the ECT sensor.
(b) Measure the resistance between the terminals.
Standard:
Tester ConnectionConditionSpecified Condition
1 - 220C (68F)2.32 to 2.59 kW
1 - 280C (176F)0.310 to 0.326 kW
NOTICE:
If checking the ECT sensor in water, be careful not to allow
water to contact the terminals. After the check, dry the sen-
sor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed
ECT sensor and read the resistance. Use an infrared thermom-
eter to measure the engine temperature in the immediate vicin-
ity of the sensor. Compare these values to the resistance/tem-
perature graph. Change the engine temperature (warm up or
allow to cool down) and repeat the test.
NG REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
OK