2001 TOYOTA HIGHLANDER diagnostic menu
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A80089
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
Sensor
Platinum Hot Wire (Heater)
Temperature Sensor
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-81
271 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0100 MASS OR VOLUME AIR FLOW CIRCUIT
DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT
LOW INPUT
DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
The Mass Air Flow (MAF) meter measures the amount of air flowing through the throttle valve. The ECM uses
this information to determine the fuel injection time and provide a proper air fuel ratio. Inside the MAF meter,
there is a heated platinum wire exposed to the flow of intake air.
By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incom-
ing air cools the wire and an internal thermistor, changing their resistance. To maintain a constant current
value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is pro-
portional to the air flow through the sensor. The ECM interprets this voltage as the intake air amount.
The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with
the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.
DTC No.DTC Detection ConditionTrouble Area
P0100When MAF meter circuit has an open or a short for more than
3 secondsOpen or short in MAF meter circuit
MAF meter
ECM
P0102When MAF meter circuit has an open for more than 3 secondsSame as DTC No. P0100
P0103When MAF meter circuit has a short for more than 3 secondsSame as DTC No. P0100
HINT:
After confirming DTC P0100, P0102 or P0103, use the hand-held tester or the OBD II scan tool to confirm
the MAF ratio from the ALL menu (to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL).
Air Flow Value (g/s)Malfunction
Approximately 0.0Open in MAF meter power source circuit
Open or short in VG circuit
271.0 or moreOpen in EVG circuit
05ESV-05
Page 1658 of 2572
A54396
+B (+) Wire Harness Side
M1
MAF Meter
05-84
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
274 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 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.
1 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (MAF RATE)
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Start the engine.
(c) Push the hand-held tester or the OBD II scan tool main switch ON.
(d) On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ALL / MAF. Read the values.
Result:
Air Flow Rate (gm/second)Proceed to
0.0A
271.0 or moreB
MAF rate greater than 1 but less than 270.0 *C
HINT:
*: The value must change when the throttle valve is opened or closed.
B Go to step 6
C CHECK FOR INTERMITTENT PROBLEMS
(See page 05-9)
A
2 CHECK MASS AIR FLOW METER (POWER SOUCE VOLTAGE)
(a) Turn the ignition switch ON.
(b) Disconnect the M1 MAF meter connector.
(c) Measure the voltage of the wire harness side connector.
Standard:
Tester ConnectionSpecified Condition
M1-1 (+B) - Body ground9 to 14 V
NG Go to step 5
OK
Page 1664 of 2572
- 20 0 20 40 60 80 100
(- 4) 32 68 104 140 176 212 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
A67628
Acceptable Fig. 1
Resistance kW
Temperature C (F)
05-90
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
280 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0110 INTAKE AIR TEMPERATURE CIRCUIT
DTC P0112 INTAKE AIR TEMPERATURE CIRCUIT LOW
INPUT
DTC P0113 INTAKE AIR TEMPERATURE CIRCUIT HIGH
INPUT
CIRCUIT DESCRIPTION
The Intake Air Temperature (IAT) sensor, mounted on the Mass
Air Flow (MAF) meter, monitors the intake air temperature. The
IAT sensor has a thermistor that varies its resistance depending
on the temperature of the intake air. When the air temperature
is low, the resistance in the thermistor increases. When the tem-
perature is high, the resistance drops. The variations in resis-
tance are reflected as changes in voltage applied to the ECM
terminal (see Fig. 1).
The IAT sensor is connected to the ECM (see below). The 5 V
power source voltage in the ECM is applied to the IAT sensor
from terminal THA via resistor R.
That is, the resistor R and the IAT sensor are connected in se-
ries. When the resistance value of the IAT sensor changes in
accordance with changes in the IAT, the voltage at terminal THA
also changes. Based on this signal, the ECM increases the fuel
injection volume to improve the driveability during cold engine
operation.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0110Step 1
Open or short in IAT (Intake
air temperature) sensor cir-
cuit for 0.5 seconds
(1 trip detection logic)Open or short in IAT sensor circuit
IAT sensor (built-in MAF meter)
ECM
P0112Step 4
Short in IAT sensor circuit for
0.5 seconds
(1 trip detection logic)
Same as DTC No. P0110
P0113Step 2
Open in IAT sensor circuit for
0.5 seconds
(1 trip detection logic)
Same as DTC No. P0110
HINT:
After confirming DTC P0110, P0112 or P0113, use the hand-held tester or the OBD II scan tool to confirm
the IAT from the ALL menu (to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL).
Temp. DisplayedMalfunction
-40°C (-40°F)Open circuit
140°C (284°F) or moreShort circuit
0596B-07
Page 1666 of 2572
A90293
M1
MAF Meter
(IAT Sensor)ECM
4
5E2THA5 V
E7
E720
28 L-B
BR G
BR
S28S29 5
5 Short
Connector
05-92
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
282 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs that are related to different systems are output simultaneously while terminal E2 is used as
a ground terminal, terminal E2 may have an open circuit.
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 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (INTAKE AIR
TEMPERATURE)
(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) On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ALL / INTAKE AIR. Read the values.
Temperature: The same as actual intake air temperature.
Result:
DisplayProceed to
-40°C (-40°F)A
140°C (284°F) or moreB
OK (same as present temperature)C
HINT:
If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F).
If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more.
B Go to step 4
C CHECK FOR INTERMITTENT PROBLEMS
(See page 05-9)
A
Page 1667 of 2572
Y
A75743
A76903
A85506
M1
MAF MeterECM
THA
E2
Wire Harness Side
M1
MAF Meter
E2THA
Y
A75742
A76903A85507
M1
MAF MeterECM
THA
E2
E7
ECM THA
E2
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-93
283 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR
OPEN IN HARNESS)
(a) Disconnect the M1 MAF meter connector.
(b) Connect terminals THA and E2 of the M1 MAF meter wire
harness side connector.
(c) Turn the ignition switch ON.
(d) On the hand-held tester or the OBD II scan tool, enter the
following menus: DIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / INTAKE AIR. Read the values.
OK:
Temperature value: 1405C (2845F) or more
OK REPLACE MASS AIR FLOW METER (IAT SEN-
SOR)
NG
3 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR
OPEN IN ECM)
(a) Disconnect the M1 MAF meter connector.
(b) Connect terminals THA and E2 of the E7 ECM connector.
HINT:
Before checking, do a visual and contact pressure check for the
ECM connector.
(c) Turn the ignition switch ON.
(d) On the hand-held tester or the OBD II scan tool, enter the
following menus: DIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / INTAKE AIR. Read the values.
OK:
Temperature value: 1405C (2845F) or more
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
Page 1668 of 2572
A75766
ECM M1
MAF Meter
THA
E2
Y
A75744
A81699A85508
M1
MAF MeterECM
THA
E2
E7
ECM
05-94
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
284 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM (See page 10-9)
4 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR
SHORT IN HARNESS)
(a) Disconnect the M1 MAF meter connector.
(b) Turn the ignition switch ON.
(c) On the hand-held tester or the OBD II scan tool, enter the
following menus: DIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / INTAKE AIR. Read the values.
OK:
Temperature value: -405C (-405F)
OK REPLACE MASS AIR FLOW METER
NG
5 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR
SHORT IN ECM)
(a) Disconnect the E7 ECM connector.
(b) Turn the ignition switch ON.
(c) On the hand-held tester or the OBD II scan tool, enter the
following menus: DIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / INTAKE AIR. Read the values.
OK:
Temperature value: -405C (-405F)
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
REPLACE ECM (See page 10-9)
Page 1669 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-95
285 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0115 ENGINE COOLANT TEMPERATURE CIRCUIT
DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT
LOW INPUT
DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
A thermistor is built into the Engine Coolant Temperature (ECT) sensor and changes the resistance value
according to the engine coolant temperature.
The structure of the sensor and connection to the ECM are the same as the Intake Air Temperature (IAT)
sensor.
HINT:
If the ECM detects the DTC P0115, P0117 or P0118, it operates the fail-safe function in which the ECT is
assumed to be 80C (176F).
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0115Step 1
Open or short in ECT (En-
gine coolant temperature)
sensor circuit for 0.5 se-
condsOpen or short in ECT sensor circuit
ECT sensor
ECM
P0117Step 4Short in ECT sensor circuit
for 0.5 secondsSame as DTC No. P0115
P0118Step 2Open in ECT sensor circuit
for 0.5 secondsSame as DTC No. P0115
HINT:
After confirming DTC P0115, P0117 or P0118, use the hand-held tester or the OBD II scan tool to confirm
the ECT from the ALL menu (to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL).
Temperature DisplayedMalfunction
-40°C (-40°F)Open circuit
140°C (284°F) or moreShort circuit
MONITOR DESCRIPTION
The ECT sensor is used to monitor the engine coolant temperature. The ECT sensor has a thermistor that
varies its resistance depending on the temperature of the engine coolant. When the coolant temperature
is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The
variations in resistance are reflected in the voltage output from the sensor.
The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature.
When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault
in the ECT sensor and sets a DTC.
Example:
When the ECM calculates that the ECT is -40C (-40F) or more than 140C (284F) and if either condition
continues for 0.5 seconds or more, the ECM will set a DTC.
0596C-07
Page 1671 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-97
287 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
If DTCs that are related to different systems are output simultaneously while terminal E2 is used as
a ground terminal, terminal E2 may have an open circuit.
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 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (ENGINE
COOLANT TEMPERATURE)
(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) On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ALL / COOLANT TEMP. Read the values.
Temperature: Same value as the actual engine coolant temperature.
Result:
Temperature DisplayedProceed to
-40°C (-40°F)A
140°C (284°F) or moreB
OK (same as present temperature)C
HINT:
If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F).
If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more.
B Go to step 4
C CHECK FOR INTERMITTENT PROBLEMS
(See page 05-9)
A