Toyota Sequoia (2005). Manual — part 78
![](/vehicles/linovind/vere/fry/yupressan.png)
A15651
ECM
Intake Air Temp. Sensor
(Built into Mass Air Flow Meter)
5
4
Y–G
5 V
THA
22
R
E8
E8
G–W
28
E2
E1
M1
THA
E2
–
DIAGNOSTICS
ENGINE
DI–115
309
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs related to different systems that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.
Read freeze frame data using
the hand−held tester
. 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, as well as other data from the time when a malfunction occurred.
![](/vehicles/linovind/vere/fry/feldd.png)
DI–116
–
DIAGNOSTICS
ENGINE
310
1
Connect hand–held tester, and read value of intake air temperature.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON and push the hand–held tester main switch ON.
(c)
When using hand–held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / INTAKE AIR.
CHECK:
Read the temperature value on the hand–held tester.
OK:
Same as actual intake air temperature.
RESULT:
Displayed Temperature
Proceed to
–40
°
C (–40
°
F)
A
140
°
C (284
°
F) or more
B
OK (Same as present temperature)
C
HINT:
If there is an open circuit, the hand–held tester indicates –40
°
C
(–40
°
F).
If there is a short circuit, the hand–held tester indicates 140
°
C (284
°
F)
or more.
B
C
Check for intermittent problems
(See page
A
![](/vehicles/linovind/vere/fry/merun.png)
A19549
THA
E2
ECM
2
1
Mass Air
Flow Meter
Mass Air
Flow Meter
4 5
M1
THA
E2
M1
B17441
THA
E2
THA
E2
ECM
Mass Air Flow Meter
M1
E8
–
DIAGNOSTICS
ENGINE
DI–117
311
2
Check for open in harness or ECM.
PREPARATION:
(a)
Disconnect the M1 mass air flow meter connector.
(b)
Connect terminals 4 and 5 of the mass air flow meter wire
harness side connector.
(c)
Turn the ignition switch ON.
(d)
When using hand–held tester, enter the following menu:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the hand–held tester.
OK:
Standard: Temperature value: 140
°
C (284
°
F) or more
OK
Confirm good connection at sensor. If OK, re-
place mass air flow meter.
NG
3
Check for open in harness or ECM.
PREPARATION:
(a)
Connect terminals THA and E2 of the E8 ECM connector.
HINT:
Before checking, do a visual and contact pressure check for the
ECM connector.
(b)
Turn the ignition switch ON.
(c)
When using hand–held tester, enter the following menu:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the hand–held tester.
OK:
Standard: Temperature value: 140
°
C (284
°
F) or more
OK
Repair or replace harness or connector.
NG
Confirm good connection at ECM. If OK, re-
place ECM (See page
![](/vehicles/linovind/vere/fry/ghui.png)
A19550
THA
E2
ECM
Mass Air Flow
Meter
M1
B17442
ECM
Mass Air Flow Meter
THA
E2
M1
E8
DI–118
–
DIAGNOSTICS
ENGINE
312
4
Check for short in harness and ECM.
PREPARATION:
(a)
Disconnect the M1 mass air flow meter connector.
(b)
Turn the ignition switch ON.
(c)
When using hand–held tester, enter the following menu:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the hand–held tester.
OK:
Standard: Temperature value: –40
°
C (–40
°
F)
OK
Replace mass air flow meter.
NG
5
Check for short in harness or ECM.
PREPARATION:
(a)
Disconnect the E8 ECM connector.
(b)
Turn the ignition switch ON.
(c)
When using hand–held tester, enter the following menu:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the hand–held tester.
OK:
Standard: Temperature value: –40
°
C (–40
°
F)
OK
Repair or replace harness or connector.
NG
Replace ECM (See page
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