2001 TOYOTA SEQUOIA engine

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
SIPSIV
DI±436
± DIAGNOSTICSENGINE
630 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check voltage between SIV and SIP terminals of air injection driver and body
ground.
PREPARATION:
(a) Disconnect the A41 air injection driver connector.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump and air switching valve are operated
using the hand±held tester, measure the voltage between
terminals A41±3 (SIV) and A41±4 (SIP) of the air injection
driver connector and body ground.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 2
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
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..
OK:
Standard:
Air pump operationTester ConnectionSpecified Condition
ONA41±3 (SIP) ± Body
ground10 V or more
OFFA41±3 (SIP) ± Body
ground3.5 to 7.7 V*
ASV operation (EASV)Tester ConnectionSpecified Condition
OPENA41±4 (SIV) ± Body
ground10 V or more
CLOSEA41±4 (SIV) ± Body
ground3.5 to 7.7 V*
*: 35 to 55 % of the +B voltage.
NG Repair or replace harness or connector be-
tween air injection driver and ECM.
OK

B17438
Wire Harness Side:
Air Pump Connector
A43
± DIAGNOSTICSENGINE
DI±437
631 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check voltage between terminal 2 of air pump and body ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A43 air pump connector.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump is operated using the hand±held tes-
ter, measure the voltage between terminal A43±2 of the
air injection driver connector and body ground.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 2
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
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..
OK:
Standard:
Air pump operationTester ConnectionSpecified Condition
ONA43±2 ± Body ground10 V or more
OFFA43±2 ± Body groundBelow 1.0 V
NG Go to step 14.
OK

B17438
Wire Harness Side:
Air Pump Connector
A43
DI±438
± DIAGNOSTICSENGINE
632 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check for open in harness and connector between air pump and body ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A43 air pump connector.
CHECK:
Check the resistance between the wire harness side connec-
tors and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
A43±1 ± Body groundBelow 1 W
NG Repair or replace harness or connector.
OK

A23475
Pressure GaugePressure Sensor
± DIAGNOSTICSENGINE
DI±439
633 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check air pump operation.
PREPARATION:
(a) Connect the pressure gauge to the air switching valve as
shown in the illustration.
(b) Connect the hand±held tester to the DLC3.
(c) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump is operated using the hand±held tes-
ter, measure the secondary air injection system pressure.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/ACTIVE TEST/AIR INJ CHECK/MANU-
AL OPERATION/OPERATION 3
HINT:
OPERATION 2: AP:ON, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
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..
OK:
Standard:
25 to 30 kPa or more
NG Replace air pump.
OK

DI±440
± DIAGNOSTICSENGINE
634 Author: Date:
2005 SEQUOIA (RM1146U)
13 Check whether DTC output recurs.
PREPARATION:
(a) Start the engine and warm it up.
(b) Turn the ignition switch OFF.
(c) Connect a hand±held tester to the DLC3.
(d) Turn the ignition switch to ON and turn the tester ON.
(e) Clear the DTCs (see page DI±43).
(f) 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 secondary air injection system, confirm the pending codes of the secondary air injec-
tion system by selecting the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO /
PENDING CODES.
(c) Read DTC and check no DTC.
OK:
DTC P2444 or P2445 for the secondary air injection system is not output.
NG Check for intermittent problems
(See page DI±11).
OK
END

B17443
Wire Harness Side:
Air Injection Driver Connector
A40
B17438
Wire Harness Side:
Air Pump Connector
A43
± DIAGNOSTICSENGINE
DI±441
635 Author: Date:
2005 SEQUOIA (RM1146U)
14 Check for open and short in harness and connector between air injection driver
and air pump.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A40 air injection driver connector.
(c) Disconnect the A43 air pump connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
VP (A40±2) ± A43±2Below 1 W
VP (A40±2) or A43±2 ±
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace air injection driver.

A23667
Soak Timer Circuit
Ignition Switch
IGSW
Power
ECM
EFI MAIN
MREL+B
15 ASource IC
Soak Timer ICMain Relay
Control IC
Battery DI±442
± DIAGNOSTICSENGINE
636 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2610 ECM/PCM Internal Engine OFF Timer Perfor-
mance
DTC SUMMARY
DTCMonitoring ItemsMalfunction Detection ConditionsTrouble AreasDetection
TimingsDetection
Logic
P2610Soak timer (built into ECM)ECM internal malfunctionECMEngine
running2 trip
CIRCUIT DESCRIPTION
To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built
into the ECM, measures 5 hours (
15 minutes) from when the ignition switch is turned OFF, before the moni-
tor is run. This allows the fuel to cool down, which stabilizes the Fuel Tank Pressure (FTP). When 5 hours
have elapsed, the ECM turns on.
MONITOR DESCRIPTION
5 hours after the ignition switch is turned OFF, the soak timer activates the ECM to begin the EVAP system
monitor. While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU
clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and
sets the DTC (2 trip detection logic).
MONITOR STRATEGY
Related DTCsP2610Soak timer (built into ECM)
Required sensors/componentsECM
Frequency of operationOnce per driving cycle
Duration10 min.
MIL operation2 driving cycles
Sequence of operationNone
DIDFX±01

± DIAGNOSTICSENGINE
DI±443
637 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Battery voltage8 V±
Ignition switchON
StarterOFF
EngineRunning
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Soak time measurement when ECM CPU clock counts 10
min.Less than 7 min., or more than 13 min.
INSPECTION PROCEDURE
HINT:

DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM
replacement is required.

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 Replace ECM (See page SF±80).
NEXT
Check whether DTC output recurs.
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Clear DTCs (see page DI±43).
(d) Start the engine and wait for 10 minutes or more.
(e) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PEND-
ING CODES.
(f) If no pending DTC is displayed, the repair has been successfully completed.