O2 sensor TOYOTA SEQUOIA 2001 Service Repair Manual

A23558
C2
Crankshaft Position Sensor
*1: Shielded C1
Crankshaft Position Sensor
ECM
G±B
(*1)
(*1)VC
E2
EC
BRJ42
J/C
D
DBR 2
Y
1
2L
G
RG2+
G2±
NE+
NE± 123
E8
19
E6
29
E6
21
E6
20
E6 E
EEJ42 J/C
± DIAGNOSTICSENGINE
DI±305
499 Author: Date:
2005 SEQUOIA (RM1146U) P1340 Case 2 (Mis±aligned):
Engine RPM600 rpm±
StarterOFF
P1341:
StarterAfter OFF to ON timing
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P1340 Case 1 (No signal):
Camshaft position sensor signalNo signal
P1340 Case 2 (Mis±aligned):
Crankshaft/camshaft alignment is mis±aligned (judged by comparing the crankshaft position to the camshaft position)
Camshaft position sensor signal: No input in appropriate timing.
P1341:
Crankshaft/Camshaft alignmentMis±aligned
Camshaft position sensor count12 or more / 720CA (= Engine 2 revolutions)
COMPONENT OPERATING RANGE
ParameterStandard Value
Camshaft position sensor signal input at every 720CA3
WIRING DIAGRAM

B17445
Wire Harness Side:
Camshaft Position Sensor
A23559
2 V / DIV
GND
Crank Angle
120°120° 180°
180°
60°60°
200 ms /DIV
B17414
E6ECM Connector
G2+
G2±
DI±306
± DIAGNOSTICSENGINE
500 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand±held tester. Because freeze frame records the engine conditions when
the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was run-
ning or stopped, the engine was warmed up or not, the air±fuel ratio was lean or rich, etc. at the time of the
malfunction.
1 Check voltage of camshaft position sensor power source circuit.
PREPARATION:
(a) Disconnect the Camshaft position sensor connector.
(b) Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal 3 of the camshaft posi-
tion sensor connector and body ground.
OK:
Standard: 4.5 to 5.5 V
NG Repair or replace harness or connector.
OK
2 Check camshaft position sensor signal.
PREPARATION:
Start the engine.
CHECK:
Check the waveform between the G2+ (E6±19) and G2±
(E6±29) of the ECM connector.
OK:
Standard: Correct waveform is as shown.
OK Replace ECM (See page IN±35).
NG

B17414
E6ECM Connector
G2+
G2±
B17445
Wire Harness Side:
Camshaft Position Sensor C1
BR3795OK NGClearance
± DIAGNOSTICSENGINE
DI±307
501 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short in harness and connector between ECM and camshaft
position sensor.
PREPARATION:
(a) Disconnect the Camshaft position sensor connector.
(b) Disconnect the E6 ECM connector.
CHECK:
Measure the resistance between wire harness side connectors.
OK:
Standard:
Tester ConnectionSpecified Condition
Camshaft position sensor (C1±2) ±
G2+ (E6±19)Below 1 W
Camshaft position sensor (C1±1) ±
G2± (E6±29)Below 1 W
Camshaft position sensor (C1±2) or
G2+ (E6±19) ± Body ground10 kW or higher
Camshaft position sensor (C1±1) or
G2± (E6±29) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
4 Inspect sensor installation and signal plate tooth of LH camshaft timing pulley.
CHECK:
Check the camshaft position sensor installation.
OK:
The camshaft position sensor is installed properly.
NG Tighten sensor installation bolt.
OK

DI±308
± DIAGNOSTICSENGINE
502 Author: Date:
2005 SEQUOIA (RM1146U)
5 Inspect signal plate tooth of LH camshaft timing pulley.
NG Replace LH camshaft timing pulley.
OK
Replace camshaft position sensor.

± DIAGNOSTICSENGINE
DI±309
503 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1440 Secondary Air Injection System Control
Valve Circuit Bank 1
DTC P1443 Secondary Air Injection System Control
Valve Circuit Bank 2
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P1440
AIV1 terminal voltage becomes less than half of the +B voltage
while the VSV for air injection control is not operating.
(1 trip detection logic)
Open or short in VSV for air injection control circuit (Bank 1)

VSV power source

VSV for air injection control (Bank 1)

ECM
P1443
AIV2 terminal voltage becomes less than half of the +B voltage
while the VSV for air injection control is not operating.
(1 trip detection logic)
Open or short in VSV for air injection control circuit (Bank 2)

VSV power source

VSV for air injection control (Bank 2)

ECM
MONITOR DESCRIPTION
The ECM detects an open or short in the circuit of the VSV for air injection control according to the AIV1
(AIV2) terminal voltage, stores the DTC, and then illuminates the MIL. When the AIV1 (AIV2) terminal voltage
is less than half of the +B voltage while the VSV for air injection control is not operating, the ECM determines
it as a malfunction.
MONITOR STRATEGY
RltdDTC
P1440Secondary air injection system control valve cir-
cuit (Bank 1) range check
Related DTCs
P1443Secondary air injection system control valve cir-
cuit (Bank 2) range check
Required sensors/componentsVSV for air injection control
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
DIDMQ±01

DI±314
± DIAGNOSTICSENGINE
508 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1441 Secondary Air Injection System Switching
Valve No.2 Stuck Open Bank 1
DTC P1444 Secondary Air Injection System Switching
Valve No.2 Stuck Open Bank 2
DTC P2440 Secondary Air Injection System Switching
Valve Stuck Open Bank 1
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P1441
Air switching valve No.2 (bank 1) stuck open:
The pressure sensor detects exhaust pulsation, when both of
air switching valve No.2 are OFF (and air switching valve ON).
(2 trip detection logic)
VSV for air injection control circuit (Bank 1)

Air switching valve No.2 (Bank 1)

VSV for air injection system (Bank 1)

ECM
P1444
Air switching valve No.2 (bank 2) stuck open:
The pressure sensor detects exhaust pulsation, when both of
air switching valve No.2 are OFF (and air switching valve ON).
(2 trip detection logic)
VSV for air injection control circuit (Bank 2)

Air switching valve No.2 (Bank 2)

VSV for air injection system (Bank 2)

ECM
P2440
Air switching valve stuck open:
The pressure sensor detects exhaust pulsation when the sys-
tem does not operate (both of air switching valve No.2 OFF,
and air switching valve OFF and air pump OFF).
This DTC means open stuck of air switching valve and ºair
switching valve No.2 (bank 1 or bank 2)º
(1 trip detection logic)
Air switching valve

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection system (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM
DIDMR±01

B17424
Monitor Operation Outline
Running
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF Engine
Air pump
ASV
(Electromagnetic Type)
ASV No.2 (Bank 1)
(Vacuum Type)*
System Air Pressure ASV No.2 (Bank 2)
(Vacuum Type)*
AB C D E F
*: ASV No.2 opens alternately per a trip.
± DIAGNOSTICSENGINE
DI±315
509 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
The ECM detects pressure change with the pressure sensor to determine malfunctioning parts in the system,
and stores the DTCs. The ECM measures pressure and/or exhaust pulsation of the system at 6 points, A
to F, when the air injection system is in operation or when not in operation. When the pressure is high, the
ECM determines the that pump operates. When exhaust pulsation is detected, the ECM determines that the
ASV is open. The ECM determines malfunction parts based on the measured value, and stores the DTCs.
Points A and B:
ECM detects pressure changes (decrease), and determines that the ASV No.2 is open.
Points C and F:
ECM detects pressure and exhaust pulsation, and determines the pressure pattern of the system.
Point D:
ECM operates the system, as indicated by the dashed lines, to determine which of the ASV No.2 is malfunc-
tioning only when pressure changes cannot be detected at point A or B.
Point E:
ECM detects exhaust pulsation to determine the condition of the system.
Pressure condition in Secondary Air Injection System (Point C and F)
Pattern 1:
Air PumpON
Air Switching Valve and Air Switching Valve No.2Open
Pressure1 kPa or more
Pulsation detectionExhaust gas pulsation detected

± DIAGNOSTICSENGINE
DI±317
511 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
P1441Air switching valve No. 2 (Bank 1) is stuck open
Related DTCsP1444Air switching valve No. 2 (Bank 2) is stuck openRelated DTCs
P2440Air switching valve and air switching valve No. 2
are stuck open
Required sensors/componentsPressure sensor, Air switching valve No. 2 (Bank 1, 2), Electromagnetic air switching valve
Frequency of operationContinuous
Duration
P1441 (Air switching valve No. 2 (Bank 1) is stuck open): 20 sec.
P1444 (Air switching valve No. 2 (Bank 2) is stuck open): 20 sec.
P2440 (Air switching valve and air switching valve No. 2 are stuck open): 18 sec.
MIL operation
P1441 (Air switching valve No. 2 (Bank 1) is stuck open): 2 driving cycles
P1444 (Air switching valve No. 2 (Bank 2) is stuck open): 2 driving cycles
P2440 (Air switching valve and air switching valve No. 2 are stuck open):
1 driving cycle
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
P1441, P1444: Air switching valve No. 2 bank 1 and/or bank 2 are stuck open
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
CASE 1
Atmospheric pressure76 kPa (570 mmHg)±
Battery voltage11.5 V±
Time after secondary air injection out of
operation10 sec.±
AIR pumpOFF
Time after engine start10 sec.±
Air switching valve No. 2 (Bank 1)OFF
Air switching valve No. 2 (Bank 2)OFF
Air injection pressure sensor failNot detected
Air switching valveON
Engine RPM±3,750 rpm
CASE 2
Atmospheric pressure76 kPa (570 mmHg)±
Battery voltage11.5 V±
AIR pumpOFF
Time after engine start10 sec.±
Air switching valve No. 2 (Bank 1)OFF
Air switching valve No. 2 (Bank 2)OFF
Air injection pressure sensor failNot detected
Engine load0%±
Intake air amount40 g/sec±
IAT at engine start±15°C (5°F)±
ECT at engine start±5°C (41°F)

DI±318
± DIAGNOSTICSENGINE
512 Author: Date:
2005 SEQUOIA (RM1146U) Air switching valve
ON
Engine RPM±3,750 rpm
P2440: Electromagnetic air switching valve and air switching valve No. 2 are stuck open
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Atmospheric pressure76 kPa (570 mmHg)±
Battery voltage11.5 V±
Time after secondary air injection out of
operation10 sec.±
Cumulative intake air amount172 g±
AIR pumpOFF
Air switching valveOFF
Air switching valve No. 2 (Bank 1)OFF
Air switching valve No. 2 (Bank 2)OFF
Engine RPM±3,750 rpm
Air injection pressure sensor failNot detected
TYPICAL MALFUNCTION THRESHOLDS
P1441, P1444: Air switching valve No. 2 bank 1 and/or bank 2 are stuck open
Detection CriteriaThreshold
CASE 1:
Both of the following conditions are metCondition (a) and (b)
(a) Cumulative pressure pulsation (When AI OFF)20 kPa (150 mmHg) or more
(b) Air pressure change (When ASV No.2 open)
(P1441 (Bank 1), P1444 (Bank 2))Less than 1 kPa (7.5 mmHg) or more
CASE 2:
Detected times of identifying condition 1 is met4 times or more
1. Cumulative pressure pulsation100 kPa (750 mmHg) or more
P2440: Electromagnetic air switching valve and air switching valve No. 2 are stuck open
Detection CriteriaThreshold
Detected times of identifying condition 1 is met4 times or more
1. Cumulative pressure pulsation100 kPa (750 mmHg) or more

DI±330
± DIAGNOSTICSENGINE
524 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1442 Secondary Air Injection System Switching
Valve No.2 Stuck Close Bank 1
DTC P1445 Secondary Air Injection System Switching
Valve No.2 Stuck Close Bank 2
DTC P2441 Secondary Air Injection System Switching
Valve Stuck Close Bank 1
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P1442
Air switching valve No.2 (bank 1) stuck close:
No pressure change (decrease) after the ECM sends an open
air switching valve No.2 (bank 1) signal.
(2 trip detection logic)

VSV for air injection control circuit (Bank 1)

Vacuum hose (VSV for air injection control ± air switching
valve No.2)

Air injector pipe (Air switching valve No.2 ± exhaust manifold)

Air switching valve No.2 (Bank 1)

VSV for air injection control (Bank 1)

ECM
P1445
Air switching valve No.2 (bank 2) stuck close:
No pressure change (decrease) after the ECM sends an open
air switching valve No.2 (bank 2) signal.
(2 trip detection logic)

VSV for air injection control circuit (Bank 2)

Vacuum hose (VSV for air injection control ± air switching
valve No.2)

Air injector pipe (Air switching valve No.2 ± exhaust manifold)

Air switching valve No.2 (Bank 2)

VSV for air injection control (Bank 2)

ECM
P2441
Air switching valve stuck close:
The pressure sensor does not detect exhaust pulsation when
system operates. (All of air switching valve ON)
This DTC means either of following conditions.
(a) Electromagnetic air switching valve stuck closed.
(b) Both of ºair switching valve No.2 bank 1º and ºair switching
valve No.2 bank 2º stuck closed.
(2 trip detection logic)
Vacuum hoses (Throttle body ± VSVs for air injection control)

Air switching valve

Air injector pipe (Air switching valve No.2 ± exhaust manifold)

Air injection hose

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection control (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM
MONITOR DESCRIPTION
Refer to DTC P1441, P1444 and P2440 on page DI±314.
DIDMS±01