TOYOTA SIENNA 2007 Service Repair Manual

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–253
ES
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
Exhaust Camshaft Sensor Range Check / Rationality (While starting engine):
Exhaust Camshaft Sensor Range Check / Rationality (After starting engine):
Exhaust Camshaft Sensor Range Check (Chattering, Low voltage, High voltage):
TYPICAL MALFUNCTION THRESHOLDS
Exhaust Camshaft Sensor Range Check / Rationality (While starting engine):
Exhaust Camshaft Sensor Range Check / Rationality (After starting engine):
Exhaust Camshaft Sensor Range Check (Chattering):
Related DTCsP0365: Exhaust camshaft sensor (Bank 1) range check / rationality (while starting
engine)
P0365: Exhaust camshaft sensor (Bank 1) range check / rationality (after starting
engine)
P0365: Exhaust camshaft sensor (Bank 1) range check (chattering)
P0367: Exhaust camshaft sensor (Bank 1) range check (low voltage)
P0368: Exhaust camshaft sensor (Bank 1) range check (high voltage)
P0390: Exhaust camshaft sensor (Bank 2) range check / rationality (while starting
engine)
P0390: Exhaust camshaft sensor (Bank 2) range check / rationality (after starting
engine)
P0390: Exhaust camshaft sensor (Bank 2) range check (chattering)
P0392: Exhaust camshaft sensor (Bank 2) range check (low voltage)
P0393: Exhaust camshaft sensor (Bank 2) range check (high voltage)
Required Sensors / Components (Main) Exhaust camshaft sensor (Bank 1 and 2)
Required Sensors / Components (Related) Exhaust camshaft sensor
Frequency of Operation Continuous
Duration5 seconds: Exhaust camshaft sensor range check / rationality (After starting engine)
4 seconds: Others
MIL Operation2 driving cycles: Exhaust camshaft sensor range check / rationality (After starting
engine)
Immediate: Others
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
Sta r t e r ON
Battery voltage while starter is ON at least once Less than 11 V
Engine RPM 600 rpm or more
Sta r t e r OF F
Battery voltage 8 V or more
Ignition Switch ON
Sta r t e r OF F
Ignition Switch ON and time after ignition switch is OFF
to ON2 seconds or more
Battery voltage 8 V or more
Exhaust camshaft sensor signal No signal
Exhaust camshaft sensor signal No signal
Exhaust camshaft sensor signal Less than 0.3 V, or more than 4.7 V

ES–2542GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Exhaust Camshaft Sensor Range Check (Low voltage):
Exhaust Camshaft Sensor Range Check (High voltage):
WIRING DIAGRAM
Refer to DTC P0335 (See page ES-222).
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data
can be helpful in determining whether the vehicle was running or stopped, whether the engine was
warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of
a malfunction.
(a) Disconnect the C21 or C20 VVT sensor connector.
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
Exhaust camshaft sensor signal Less than 0.3 V
Exhaust camshaft sensor signal More than 4.7 V
1CHECK VVT SENSOR FOR EXHAUST CAMSHAFT (SENSOR POWER SOURCE)
A107149E59
Tester Connection Specified Condition
VC2 (C20-3) - Body ground 4.5 to 5.0 V
VC2 (C21-3) - Body ground 4.5 to 5.0 V
Go to step 7

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–255
ES
(a) Disconnect the C21 or C20 VVT sensor for exhaust
camshaft connector.
(b) Disconnect the E11 ECM connector.
(c) Measure the resistance between the wire harness side
connectors.
Standard resistance:
Check for open
Check for short
NG
OK
(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.
NG
OK
(a) Check the teeth of the camshaft.
NG
OK
2CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)
A165549E02
Tester Connection Specified Condition
EX+ (C21-1) - EV1+ (E11-25) Below 1
EX- (C21-2) - EV1- (E11-24) Below 1
EX+ (C20-1) - EV2+ (E11-23) Below 1
EX- (C20-2) - EV2- (E11-22) Below 1
Tester Connection Specified Condition
EX+ (C21-1) - EV1+ (E11-25) - Body ground 10 k
or higher
EX- (C21-2) - EV1- (E11-24) - Body ground 10 k
or higher
EX+ (C20-1) - EV2+ (E11-23) - Body ground 10 k
or higher
EX- (C20-2) - EV2- (E11-22) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (VVT SENSOR - ECM)
3CHECK VVT SENSOR FOR EXHAUST CAMSHAFT (SENSOR INSTALLATION)
BR03795E18
REPAIR OR REPLACE VVT SENSOR
4CHECK EXHAUST CAMSHAFT
REPLACE EXHAUST CAMSHAFT

ES–2562GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Replace the VVT sensor (See page ES-509).
NEXT
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the intelligent tester on.
(d) Clear the DTCs.
(e) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC / INFO / PENDING CODES.
(f) Read the DTCs.
Result
HINT:
If the engine does not start, replace the ECM.
B
A
5REPLACE VVT SENSOR (FOR EXHAUST CAMSHAFT)
6CHECK WHETHER DTC OUTPUT RECURS
Display (DTC Output) Proceed to
No output A
P0365, P0352, P0353, P0354, P0355 or P0356 B
REPLACE ECM (See page ES-498)
END

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–257
ES
(a) Disconnect the C18 or C19 VVT sensor connector.
(b) Disconnect the E9 ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance :
Check for open
Check for short
(d) Reconnect the VVT sensor connector.
(e) Reconnect the ECM connector.
NG
OK
7CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM)
A165583E02
Tester Connection Specified Condition
VC2 (C20-3) - VC (E9-23) Below 1
VC2 (C21-3) - VC (E9-23) Below 1
Tester Connection Specified Condition
VC2 (C20-3) or VC (E9-23) - Body ground 10 k
or higher
VC2 (C21-3) or VC (E9-23) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (VVT SENSOR - ECM)
REPLACE ECM (See page ES-498)

ES–2582GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
MONITOR DESCRIPTION
The ECM uses the sensors mounted in front of and behind the three-way catalyst (TWC) to monitor its
efficiency. The first sensor, an Air Fuel ratio (A/F) sensor, sends pre-catalyst A/F ratio information to the
ECM. The second sensor, a heated oxygen sensor (O2S), sends post-catalyst information to the ECM.
The ECM compares these 2 signals to judge the efficiency of the catalyst and the catalyst's ability to store
oxygen. During normal operation, the TWC stores and releases oxygen as needed. The capacity to store
oxygen results in a low variation in the post-TWC exhaust stream.
If the catalyst is functioning normally, the waveform of the heated oxygen sensor slowly switches between
RICH and LEAN. If the catalyst is deteriorated, the waveform will alternate frequently between RICH and
LEAN. As the catalyst efficiency degrades, its ability to store oxygen is reduced and the catalyst output
becomes more variable. When running the monitor, the ECM compares sensor 1 signals (A/F sensor)
over a specific amount of time to determine catalyst efficiency. The ECM begins by calculating the signal
length for both sensors (for the rear oxygen sensor, the ECM uses the output voltage signal length). If the
oxygen sensor output voltage signal length is greater than the threshold (threshold is calculated based on
the A/F sensor signal length), the ECM concludes that the catalyst is malfunctioning. The ECM will turn on
the MIL and a DTC will be set.
HINT:
• Bank 1 refers to the bank that includes cylinder No. 1.
• Bank 2 refers to the bank that does not include cylinder No. 1.
• Sensor 1 refers to the sensor closest to the engine assembly.
• Sensor 2 refers to the sensor farthest away from the engine assembly.
MONITOR STRATEGY
DTC P0420Catalyst System Efficiency Below Threshold
(Bank 1)
DTC P0430Catalyst System Efficiency Below Threshold
(Bank 2)
DTC No. DTC Detection Condition Trouble Area
P0420Oxygen Storage Capacity (OSC) value is smaller than
standard value under active air-fuel ratio control (2 trip
detection logic)• Gas leakage from exhaust system
• A/F sensor (bank 1 sensor 1)
• HO2 sensor (bank 1 sensor 2)
• Exhaust manifold (TWC)
P0430OSC value is smaller than standard value under active
air-fuel ratio control (2 trip detection logic)• Gas leakage from exhaust system
• A/F sensor (bank 2 sensor 1)
• HO2 sensor (bank 2 sensor 2)
• Exhaust manifold (TWC)
Related DTCsP0420: Catalyst Deterioration
P0430: Catalyst Deterioration
Required Sensors / Components (Main) TWC
Required Sensors / Components (Related)A/F sensor, heated oxygen sensor, intake air temperature sensor, mass air flow
meter, crankshaft position sensor and engine coolant temperature sensor
Frequency of Operation Once per driving cycle
Duration Approximately 30 seconds
MIL Operation 2 driving cycles
Sequence of Operation None

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–259
ES
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).
CONDITIONING FOR SENSOR TESTING
HINT:
Perform the operation with the engine speeds and durations described below prior to checking the
waveforms of the A/F and HO2 sensors. This is in order to activate the sensors sufficiently to obtain the
appropriate inspection results.
The monitor will run whenever these DTCs are not
presentP0011, P0012 (VVT System 1-Advance, Retard), P0021, P0022 (VVT System 2-
Adavance, Retard), P0031, P0032, P0051, P0052 (A/F Sensor Heater Sensor 1),
P0037, P0038, P0057, P0058 (O2 Sensor heater Sensor 2), P0100, P0101, P0102,
P0103 (MAF Sensor), P0115, P0116, P0117, P0118 (ECT Sensor), P0120, P0121,
P0122, P0123, P0220, P0222, P0223 , P2135 (TP Sensor), P0125 (Insufficient ECT
for Closed Loop), P0136, P0156 (O2 Sensor 2), P0171,P0172 (Fuel System),
P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire), P0335 (CKP
Sensor), P0340 (CMP Sensor), P0351, P0352, P0353, P0354, P0355, P0356
(Ignitor), P0500 (VSS), P2196, P2198 (A/F Sensor (Rationality)), P2A00, P2A03 (A/
F Sensor (Slow Response))
Battery voltage 11 V or more
IAT -10
C (14F) or more
ECT 75
C (167F) or more
Atmospheric pressure 0.75 or more
Idle OFF
Engine RPM Less than 3200 rpm
A/F sensor Activated
Fuel system status Closed loop
Engine load 10 to 70%
All of the following conditions are met Conditions 1, 2 and 3
1. Mass air flow rate 5 to 60 g/sec.
2. Front catalyst temperature (estimated) 600 to 750
C (1112 to 1382F)
3. Rear catalyst temperature (estimated) 100 to 900
C (212 to 1652F)
Rear HO2S monitor Completed
Shift position 4th or more
Oxygen Storage Capacity (OSC) of catalyst Less than 0.046 g (0.000101 lb)

ES–2602GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
1. Connect the intelligent tester to the DLC3 (Procedure "A").
2. Start the engine and warm it up with all the accessories switched off, until the engine coolant
temperature stabilizes (Procedure "B").
3. Run the engine at an engine speed of between 2500 rpm and 3000 rpm for at least 3 minutes
(Procedure "C").
4. While running the engine at 3000 rpm for 2 seconds and at 2000 rpm for 2 seconds, check the
waveforms of the A/F and HO2 sensors using the tester (Procedure "D").
HINT:
• If either of the voltage outputs of the Air-Fuel Ratio (A/F) or Heated Oxygen (HO2) sensor does not
fluctuate, or either of the sensors makes a noise, the sensor may be malfunctioning.
• If the voltage outputs of both the sensors remain lean or rich, the air-fuel ratio may be extremely
lean or rich. In such cases, perform the following A/F CONTROL using the intelligent tester.
• If the Three-Way Catalytic Converter (TWC) has deteriorated, the HO2 sensor (located behind the
TWC) voltage output fluctuates up and down frequently, even under normal driving conditions
(active air-fuel ratio control is not performed).
A093766E27
A076893E08

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–261
ES
1. A/F CONTROL
HINT:
Intelligent tester only:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the
ACTIVE TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F)
sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using an intelligent
tester.
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the tester on.
(c) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(d) On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE
TEST / A/F CONTROL.
(e) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or
LEFT button to change the fuel injection volume).
(f) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS
B2S1 and O2S B2S2) displayed on the tester.
HINT:
• The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the
injection volume by 25%.
• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
Standard voltage
CAUTION:
The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated
Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.
Tester Display (Sensor) Injection Volumes Status Voltages
AFS B1S1 or AFS B2S1 (A/F) +25% Rich Less than 3.0
AFS B1S1 or AFS B2S1 (A/F) -12.5% Lean More than 3.35
O2S B1S2 or O2S B2S2 (HO2) +25% Rich More than 0.55
O2S B1S2 or O2S B2S2 (HO2) -12.5% Lean Less than 0.4
CaseA/F Sensor (Sensor 1)
Output VoltageHO2 Sensor (Sensor 2)
Output VoltageMain Suspected
Trouble Area
1-

ES–2622GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
• Following the A/F CONTROL procedure enables technicians to check and graph the voltage
outputs of both the A/F and HO2 sensors.
• To display the graph, select the following menu items on the tester: DIAGNOSIS /
ENHANCED OBD II / ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S
B1S2 or AFS B2S1 and O2S B2S2. Press the YES button and then the ENTER button. Then
press the F4 button.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data
can be helpful in determining whether the vehicle was running or stopped, whether the engine was
warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of
a malfunction.
(a) Connect the intelligent tester to the DLC3.
2• A/F sensor
• A/F sensor
heater
• A/F sensor
circuit
3• HO2 sensor
• HO2 sensor
heater
• HO2 sensor
circuit
4•Fuel pressure
• Gas leakage
from exhaust
system
(Air-fuel ratio
extremely lean
or rich)
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430)
CaseA/F Sensor (Sensor 1)
Output VoltageHO2 Sensor (Sensor 2)
Output VoltageMain Suspected
Trouble Area