Toyota Sequoia (2005). Manual — part 107
B17411
E8
IGT8
IGT2
IGT4
IGT5
IGT6
IGT3
IGT7
IGT1
E1
(+)
(–)
(+)
(+)
(+)
(+)
(+)
(+)
(+)
E6
–
DIAGNOSTICS
ENGINE
DI–231
425
6
Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGT1 – IGT8 and E1 of ECM connector.
PREPARATION:
(a)
Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.
(b)
Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminals the E6 and E8 ECM
connectors when the engine is cranked.
OK:
Standard:
Tester Connection
Specified Condition
IGT1 (E8–8) – E1 (E6–1)
4.5 V or more
IGT2 (E8–15) – E1 (E6–1)
4.5 V or more
IGT3 (E8–11) – E1 (E6–1)
4.5 V or more
IGT4 (E8–10) – E1 (E6–1)
4.5 V or more
IGT5 (E8–13) – E1 (E6–1)
4.5 V or more
IGT6 (E8–12) – E1 (E6–1)
4.5 V or more
IGT7 (E8–14) – E1 (E6–1)
4.5 V or more
IGT8 (E8–9) – E1 (E6–1)
4.5 V or more
NG
Replace ECM (See page
OK
A21025
Wire Harness Side:
I1
I2
I3
I4
I5
I6
I7
I8
Ignition Coil with
Igniter Connector
DI–232
–
DIAGNOSTICS
ENGINE
426
7
Check ignition coil with igniter power source circuit.
PREPARATION:
(a)
Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.
(b)
Turn the ignition switch to ON.
CHECK:
Measure the voltage between the terminal of the wire harness
side connector and body ground.
OK:
Standard:
Tester Connection
Specified Condition
I1–1 – Body ground
I2–1 – Body ground
I3–1 – Body ground
I4–1 – Body ground
9 t 14 V
I5–1 – Body ground
9 to 14 V
I6–1 – Body ground
I7–1 – Body ground
I8–1 – Body ground
OK
Repair ignition coil with igniter.
NG
A21025
Wire Harness Side:
I1
I2
I3
I4
I5
I6
I7
I8
Ignition Coil with Igniter
A21378
Wire Harness Side:
I18
Ignition Switch
IG2
–
DIAGNOSTICS
ENGINE
DI–233
427
8
Check for open and short in harness and connector between ignition switch and
ignition coil with igniter.
PREPARATION:
(a)
Disconnect the I1, 2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.
(b)
Disconnect the I18 ignition switch connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester Connection
Specified Condition
Ignition coil (I1–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I2–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I3–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I4–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I5–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I6–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I7–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I8–1) – IG2 (I18–6)
Below 1
Ω
Ignition coil (I1–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I2–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I3–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I4–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I5–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I6–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I7–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
Ignition coil (I8–1) or IG2 (I18–6) –
Body ground
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
Replace ignition coil with igniter.
B17432
Air Pump
Pressure
Sensor
Air
Air Injection
Driver (AID)
Air Switching Valve
(ASV)(EASV)
Air Switching Valve No.2
(ASV No.2)(ASV1)
VSV for Air Injection
Control
ECM
Engine Coolant
Temp. Sensor
Mass Air Flow
Meter
Intake Air Temp.
Sensor
To Bank 2
To Bank1
Air Switching Valve No.2
(ASV No.2)(ASV2)
DI–234
–
DIAGNOSTICS
ENGINE
428
DTC
P0412
Secondary Air Injection System Air Switch-
ing Valve ”A” Circuit
CIRCUIT DESCRIPTION
The secondary air injection system pumps air to the exhaust port to accelerate the activation of the catalyst.
The secondary air injection system consists of the ECM, air pump, Air Switching Valve (ASV) (EASV), Air
Switching Valve No.2 (ASV No.2) (ASV1, 2), pressure sensor and air injection driver (AID). The Air Switching
Valve (ASV)(EASV) is an electromagnetic type and Air Switching Valve No.2 (ASV No.2)(ASV1,2) is a vacu-
um type.
The secondary air injection system pumps pressurized air to the exhaust port by the air pump through the
ASV and ASV No.2. The ASV assists the ASV
No.2. The ASV No.2 also controls air supply.
The ECM sends signals to the AID, and then the AID operates the air pump and ASV. The pressure sensor
detects pressure and exhaust pulsation in the system when the system operates and when it does not oper-
ate, and sends the data to the ECM.
DTC No.
DTC Detection Condition
Trouble Area
P0412
All of the following conditions are met when engine is idling just
after cold start
(1 trip detection logic):
(a) Air injection system does not operate (Air pump OFF and all
ASVs OFF)
(b) Air injection driver diagnostic signal duty is 40%.
Open in air switching valve drive circuit
Short between air switching valve circuit and +B circuit
Air injection driver
Air switching valve
ECM
P0412
All of the following conditions are met when engine is idling just
after cold start
(1 trip detection logic):
(a) Air injection system operates (Air pump ON and all ASVs
ON)
(b) Air injection driver diagnostic signal duty is 40%.
Short between air switching valve circuit and body ground
Air injection driver
Air switching valve
ECM
DIDMV–01
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