2001 TOYOTA SEQUOIA Page 18

DI±344
± DIAGNOSTICSENGINE
538 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
Related DTCsP1613Secondary air injection system control module
range check
Required sensors/componentsAir injection driver
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Case 1:
Battery voltage8 V±
Ignition switchON
StarterOFF
Case 2:
Either of following conditions is metCondition 1 or 2
1. Air pumpNot operating
2. Air switching valveNot operating
Battery voltage8 V±
Ignition switchON
StarterOFF
Case 3:
Air pumpOperating
Air switching valveOperating
Battery voltage8 V±
Ignition switchON
StarterOFF
Case 4:
Battery voltage8 V±
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Case 1:
One of the following conditions is metCondition 1, 2, 3 or 4
1. Diagnostic signal duty ratio from air injection driver1 to 10 %
2. Diagnostic signal duty ratio from air injection driver30 %
3. Diagnostic signal duty ratio from air injection driver49 %
4. Diagnostic signal duty ratio from air injection driver91 to 99 %
Case 2:
Diagnostic signal duty ratio from air injection driver70 to 90 %

B17411
ECM Connector
E1AIDI
A16555
AIR INJ CHECK
AIR PUMP............................ON
EASV ............................OPEN
ASV1. .............................OPEN
ASV2...............................OPEN
A/F BANK1.......................19.05
A/F BANK2.......................19.05
PRESSURE....................17 kPa
PULSATION..............25.39 kPa
AI STATUS...........................OK
Remaining Time 05 sec.
Press [EXIT] to quit
± DIAGNOSTICSENGINE
DI±345
539 Author: Date:
2005 SEQUOIA (RM1146U) Case 3:
Diagnostic signal duty ratio from air injection driver0 %
Case 4:
Diagnostic signal duty ratio from air injection driver100 %
COMPONENT OPERATING RANGE
ParameterStandard Value
Diagnostic signal duty ratio from air injection driver
70 to 90% when secondary air injection system operating
and
0% when secondary air injection system not operating
WIRING DIAGRAM
Refer to DTC P0412 on page DI±234.
INSPECTION PROCEDURE
HINT:
The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diag-
nostic information terminal of the AID. It narrows a trouble area search to read the waveform on the oscillo-
scope when performing the AI system intrusive operation function provided in the SYSTEM CHECK.
(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) Connect an oscilloscope probe to the AIDI terminal of the
ECM.
(e) Start the engine and turn the tester ON.
(f) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ SYSTEM.
(g) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ CHECK / MANUAL OPERATION / OPERATION
1 and 2.
HINT:
OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:OFF
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN

DI±348
± DIAGNOSTICSENGINE
542 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:

Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand±held tester func-
tion, conditions for air±fuel ratio and pressure in the secondary air injection system passage can be
checked while the secondary air injection system operating. It helps technicians to troubleshoot the
system when it malfunctioning.

Read freeze frame data using a hand±held tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, 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 any other DTCs output (In addition to air injection system DTCs).
PREPARATION:
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
CHECK:
(a) Read DTCs.
RESULT:
Display (DTC Output)Proceed To
P1613A
P1613 and other DTCsB
HINT:
If any DTCs other than P1613 are output, troubleshoot those DTCs first.
B Go to DTC chart (See page DI±58).
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
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

± DIAGNOSTICSENGINE
DI±353
547 Author: Date:
2005 SEQUOIA (RM1146U)
9 Replace air injection driver.
NEXT
10 Check whether DTC output recurs.
PREPARATION:
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the tester ON.
(c) Clear the DTCs (see page DI±43).
(d) Start the engine.
CHECK:
(a) Perform SYSTEM CHECK to operate the air injection system.
Select the following menu items: DIAGNOSIS/ENHANCED OBD II/SYSTEM CHECK/AIR INJ
CHECK/AUTOMATIC OPERATION
(b) After operating the secondary air injection system, confirm the pending codes of the secondary air in-
jection system by selecting the following menu items: DIAGNOSIS/ENHANCED OBD II/DTC INFO/
PENDING CODES.
OK:
DTC P1613 for the secondary air injection system is not output.
NG Go to DTC chart (See page DI±58).
OK
END

± DIAGNOSTICSENGINE
DI±355
549 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
RltdDTC
P2102Throttle actuator control motor current
(Low current)
Related DTCs
P2103Throttle actuator control motor current
(High current)
Required sensors/componentsThrottle actuator motor
Frequency of operationContinuous
Duration2 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
P2102:
Throttle motorON
Duty±cycle ratio to open throttle actuator80%±
Throttle actuator power supply8 V±
Current motor current ± Motor current at
0.016 sec. before±0.2 A
P2103:
Throttle motorON
Either of the following conditions is met:Condition 1 or 2
1. Throttle actuator power supply8 V±
2. Throttle actuator powerON
Battery voltage8 V±
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P2102:
Throttle motor currentLess than 0.5 A (when motor drive duty 80% or more)
P2103:
Throttle motor currentMore than 10 A (0.1 sec.)
More than 7 A (0.6 sec.)
WIRING DIAGRAM
Refer to DTC P0120 on page DI±127.

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