2001 TOYOTA SEQUOIA check engine

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

Example: 80% Duty Signal5 V/DIV.
GND
20 ms/DIV. DI±346
± DIAGNOSTICSENGINE
540 Author: Date:
2005 SEQUOIA (RM1146U)
(1) Monitor the voltage output of the AID (duty ratio sig-
nal).
Oscilloscope range:
ItemsContents
TerminalsCH1: AIDI ± E1
Equipment Settings5 V/Division, 20 to 40 ms/Division
ConditionsIdling
NOTICE:

This AIR INJECTION CHECK only allows technicians to operate the AI system for 5 seconds.
Furthermore, the check can be performed 4 times a trip. If the test is repeated, intervals of at
least 30 seconds are required between checks.
While the AI system operation using the hand±held tester is prohibited, the tester displays the
prohibition (WAIT or ERROR). If the ERROR (AI STATUS NG) is displayed on the tester, stop the
engine for 10 minutes and then try again.

Performing the AIR INJ CHECK over and over again may cause the damage in the secondary
air injection system. If necessary, put an interval of several minutes between tests to prevent
overheating the system.

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
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