2001 TOYOTA SEQUOIA terminal TC

B17411
E4
AIDI
± DIAGNOSTICSENGINE
DI±349
543 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check voltage between AIDI terminal of ECM and body ground.
PREPARATION:
(a) Start the engine and warm it up.
(b) Turn the ignition switch to OFF.
(c) Connect a hand±held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
(e) Start the engine.
(f) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/AU-
TOMATIC OPERATION
CHECK:
Measure the voltage between terminal E4±13 (AIDI) of the
ECM connector and body ground when the air injection system
is both ON and OFF.
RESULT:
ResultsSuspected Trouble AreasProceed To
Fixed at Low (1.6 V or less)
even when AI system ON
(Air pump ON, ASV ON)

Short between air pump or air switching valve
command signal circuit and body ground

Open in air pump command signal circuit (be-
tween ECM and AID)

Open in ASV command signal circuit (between
ECM and AID)

Open in AID ground circuit (between AID and
body ground)

Diagnostic signal circuit ground short

AID

ECM
A
Fixed at High (12 V or more)
even when AI system OFF
(Air pump OFF, ASV OFF)

Open in diagnostic signal circuit (ECM ± AID)

Short between +B circuit and diagnostic signal
circuit (ECM ± AID)

Open in AID power source circuit

AID

ECM
B
Other than above:

Fluctuating (duty signal excluding 20, 40,
80%)
AID

Open in AID ground circuit (between AID and
body ground)
C
B Go to step 5.
C Go to step 8.
A

B17411
E4
AIRVAIRP
B17444
Wire Harness Side:
Air Injection Driver Connector
A41
SIPSIVDI E
B17417
E4
AIRP
AIRV DI±350
± DIAGNOSTICSENGINE
544 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between AIRP, AIRV terminals of ECM and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals E4±25 (AIRP), E4±4
(AIRV) of the ECM connector, and body ground.
OK:
Tester ConnectionSpecified Condition
E4±25 (AIRP) ± Body ground10 V or more
E4±4 (AIRV) ± Body ground10 V or more
NG Replace ECM (See page SF±80).
OK
4 Check for short in harness and connector between SIP terminal of air injection
driver and SIRP of ECM.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Disconnect the E4 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
SIP (A41±4) or AIRP (E4±25) ±
Body ground10 kW or higher
SIV (A41±3) or AIRV (E4±4) ±
Body ground10 kW or higher
E (A41±1) ± Body groundBelow 1 W
CHECK:
Measure the voltage between terminals DI (A41±2) and E
(A41±1) of the air injection driver wire harness side connectors.
OK:
Standard:
Tester ConnectionSpecified Condition
DI (A41±2) ± E (A41±1)9 V or more

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
+BE
B17444
Wire Harness Side:
Air Injection Driver Connector
A41
DI
± DIAGNOSTICSENGINE
DI±351
545 Author: Date:
2005 SEQUOIA (RM1146U)
NG Repair or replace harness or connector.
OK
Replace air injection driver.
5 Inspect air injection driver power source circuit.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminals +B (A41±5) and E
(A41±1) of the air injection driver connector.
OK:
Standard:
Tester ConnectionSpecified Condition
A41±5 (+B) ± E (A41±1)10 V or more
NG Repair or replace harness or connector.
OK
6 Check voltage between DI terminals of air injection driver and body ground.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal A41±2 (DI) of the air in-
jection driver connector and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
A41±2 (DI) ± Body ground10 V or more
NG Go to step 7.
OK

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
DI+B
B17417
E4
AIDI
B17444
Wire Harness Side:
Air Injection Driver Connector
A41
E
DI±352
± DIAGNOSTICSENGINE
546 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check for short in harness and connector between DI terminal of air injection
driver and AIDI terminal of ECM.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Disconnect the E4 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
DI (A41±2) ± AIDI (E4±13)Below 1 W
DI (A41±2) or AIDI (E4±13) ±
+B (A41±5)10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF±80).
8 Inspect air injection driver ground circuit.
PREPARATION:
Disconnect the A41 air injection driver connector.
CHECK:
Measure the resistance between terminal E (A41±1) of the air
injection driver connector and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
E (A41±1) ± Body ground10 V or more
NG Repair or replace harness or connector.
OK

A21034
T14
Component Side:
M+M± Throttle Control Motor and Sensor
DI±356
± DIAGNOSTICSENGINE
550 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
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.
1 Check throttle control motor.
PREPARATION:
Disconnect the throttle control motor and sensor connector.
CHECK:
Measure the resistance between terminals of the throttle con-
trol motor.
OK:
Standard:
Tester ConnectionSpecified Condition
M+ (T14±2) ± M± (T14±1)0.3 to100 W (20°C (68°F))
NG Replace throttle body (See page SF±39).
OK

A21034
T14
Component Side:
M+M± Throttle Control Motor and Sensor
A21022
T14
M+ M±
Wire Harness Side:
Throttle Control Motor and Sensor
B17412M+
M±
E8ECM Connector
± DIAGNOSTICSENGINE
DI±361
555 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check throttle control motor.
PREPARATION:
Disconnect the throttle control motor and sensor connector.
CHECK:
Measure the resistance between terminals of the throttle con-
trol motor.
OK:
Standard:
Tester ConnectionSpecified Condition
M+ (T14±2) ± M± (T14±1)0.3 to100 W (20°C (68°F))
NG Replace throttle body (See page SF±39).
OK
4 Check for open and short in harness and connector between ECM and throttle
control motor.
PREPARATION:
(a) Disconnect the T14 throttle control motor and sensor con-
nector.
(b) Disconnect the E8 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
M+ (T14±2) ± M+ (E8±3)Below 1 W
M± (T14±1) ± M± (E8±2)Below 1 W
M+ (T14±2) or M+ (E8±3) ±
Body ground10 kW or higher
M± (T14±1) or M± (E8±2) ±
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI±11).

A21380
Engine Room J/B
ETCS
Fuse
B17411
+BM (+) E6
E4
E1 (±)
± DIAGNOSTICSENGINE
DI±365
559 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
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.
1 Check ETCS fuse.
PREPARATION:
Remove the ETCS fuse from the engine room J/B.
CHECK:
Check the resistance of the ETCS fuse.
OK:
Below 1 W
NG Check for short in all harness and components
connected to ETCS fuse.
OK
2 Check voltage between terminal +BM and E1 of ECM connector.
CHECK:
Measure the voltage between the specified terminals of the E6
and E4 ECM connector.
OK:
Standard:
Tester ConnectionSpecified Condition
+BM (E4±7) ± E6 (E6±1)9 to 14 V
OK Check for intermittent problems
(See page DI±11).
NG

A21380
Engine Room J/B
ETCS
Fuse
B17417
E4
+BM
DI±366
± DIAGNOSTICSENGINE
560 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open or short in harness or connector between battery and ETCS fuse,
ETCS fuse and ECM.
PREPARATION:
(a) Remove the ETCS fuse from the engine room J/B.
(b) Disconnect the E4 ECM connector.
CHECK:
Measure the resistance of the wire harness side connector be-
tween the ETCS fuse and ECM.
OK:
Standard:
Tester ConnectionSpecified Condition
Engine Room J/B (ETCS fuse
terminal) ± +BM (E4±7)Below 1 W
Engine Room J/B (ETCS fuse
terminal) or +BM (E4±7) ±
Body ground
10 kW or higher
PREPARATION:
(a) Remove the ETCS fuse from the engine room J/B.
(b) Disconnect the battery positive terminal.
CHECK:
Measure the resistance of the wire harness side connector be-
tween the ETCS fuse and battery.
OK:
Standard:
Tester ConnectionSpecified Condition
Engine Room J/B (ETCS fuse
terminal) ± Battery positive terminalBelow 1 W
Engine Room J/B (ETCS fuse
terminal) or
Battery positive terminal ± Body ground
10 kW or higher
NG Repair or replace harness or connector.
OK
Check engine room J/B.