Position TOYOTA SIENNA 2007 Service Repair Manual

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–163
ES
INSPECTION PROCEDURE
HINT:
• If any of DTCs P0115, P0116, P0117 or P0118 are set simultaneously with DTC P0125, the Engine
Coolant Temperature (ECT) sensor may have an open or a short circuit. Troubleshoot those DTCs first.
• 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.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
Result
HINT:
If any DTCs other than P0125 are output, troubleshoot
those DTCs first.
B
A
(a) Remove the thermostat (See page CO-16).
(b) Check the valve opening temperature of the thermostat
(See page CO-17).
Standard:
80 to 84
C (176 to 183F)
HINT:
In addition to the above check, confirm that the valve is
completely closed when the temperature is below the
standard.
(c) Reinstall the thermostat (See page CO-17).
NG
OK
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125)
Display (DTC Output) Proceed to
P0125 A
P0125 and other DTCs B
GO TO DTC CHART (See page ES-56)
2INSPECT THERMOSTAT
REPLACE THERMOSTAT (See page CO-16)

ES–1662GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
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.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
Required Sensors / Components (Related)Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT) sensor,
Vehicle speed sensor
Frequency of Operation Once per driving cycle
Duration 900 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentP0010, P0020 (VVT VSV 1, 2), P0011, P0012 (VVT System 1-Advance, Retard),
P0021, P0022 (VVT System 2-Adavance, Retard), P0031, P0032, P0051, P0052 (A/
F Sensor Heater Sensor 1), P0100, P0101, P0102, P0103 (MAF Sensor), P0110,
P0112, P0113 (IAT Sensor), P0115, P0116, P0117, P0118 (ECT 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), P0345 (VVT 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
Either of following conditions is met: Condition 1 or 2
1. All of following conditions are met: Conditions (a), (b) and (c)
(a) ECT at engine start - IAT at engine start -15 to 7
C (5 to 45F)
(b) ECT at engine start -10 to 56
C (14 to 133F)
(c) IAT at engine start -10 to 56
C (14 to 133F)
2. All of following conditions are met: Conditions (d), (e) and (f)
(d) ECT at engine start - IAT at engine start More than 7
C (45F)
(e) ECT at engine start 56
C (133F) or less
(f) IAT at engine start -10
C (14F) or more
Accumulated time that vehicle speed is 80 mph (128
km/h) or moreLess than 20 seconds
Duration that all of the following conditions 1 and 2 are
met5 seconds or more
1. Estimated ECT 75
C (167F) or more
2. ECT sensor output Less than 75
C (167F)
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)

ES–1722GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
High or Low Impedance of Heated Oxygen (HO2) Sensor (DTCs P0136 and P0156 or P0137 and
P0157)
During normal air-fuel ratio feedback control, there are small variations in the exhaust gas oxygen
concentration. In order to continuously monitor the slight variation of the HO2 sensor signal while the
engine is running, the impedance* of the sensor is measured by the ECM. The ECM determines that there
is a malfunction in the sensor when the measured impedance deviates from the standard range.
*: The effective resistance in an alternating current electrical circuit.
HINT:
• The impedance cannot be measured using an ohmmeter.
• DTCs P0136 and P0156 indicate the deterioration of the HO2 sensor. The ECM sets the DTCs by
calculating the impedance of the sensor when the typical enabling conditions are satisfied (1 driving
cycle).
• DTCs P0137 and P0157 indicate an open or short circuit in the HO2 sensor (1 driving cycle). The ECM
sets the DTCs when the impedance of the sensor exceeds the threshold 15 k
.
MONITOR STRATEGY
Related DTCsP0136: Heated oxygen sensor output voltage (Output voltage) (bank 1)
P0136: Heated oxygen sensor impedance (Low) (bank 1)
P0137: Heated oxygen sensor output voltage (Low voltage) (bank 1)
P0137: Heated oxygen sensor impedance (High) (bank 1)
P0138: Heated oxygen sensor output voltage (High voltage) (bank 1)
P0138: Heated oxygen sensor output voltage (Extremely high) (bank 1)
P0156: Heated oxygen sensor output voltage (Output voltage) (bank 2)
P0156: Heated oxygen sensor impedance (Low) (bank 2)
P0157: Heated oxygen sensor output voltage (Low voltage) (bank 2)
P0157: Heated oxygen sensor impedance (High) (bank 2)
P0158: Heated oxygen sensor output voltage (High voltage) (bank 2)
P0158: Heated oxygen sensor impedance (Extremely high) (bank 2)
Required Sensors / Components (Main) Heated oxygen sensor
Required Sensors / Components (Related)Crankshaft position sensor, engine coolant temperature sensor, mass air flow meter
and throttle position sensor
Frequency of OperationOnce per driving cycle: Active air-fuel ratio control detection
Continuous: Others
Duration20 seconds: Heated oxygen sensor output (Output voltage, High voltage, Low
voltage)
30 seconds: Heated oxygen sensor impedance (Low)
90 second.: Heated oxygen sensor impedance (High)
10 seconds: Heated oxygen sensor impedance (Extremely high)
MIL Operation 2 driving cycles
Sequence of Operation None
A076841E14

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–173
ES
TYPICAL ENABLING CONDITIONS
All:
Heated Oxygen Sensor Output Voltage (Output Voltage, High Voltage and Low Voltage):
Heated Oxygen Sensor Impedance (Low):
Heated Oxygen Sensor Impedance (High):
Heated Oxygen Sensor Output Voltage (Extremely High):
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Output Voltage (Output voltage):
Heated Oxygen Sensor Output Voltage (Low output voltage):
The monitor will run whenever these DTCs are not
presentP0031, P0032, P0051, P0052 (A/F Sensor Heater Sensor 1), P0100, P0101, P0102,
P0103 (MAF Sensor), P0110, P0112, P0113 (IAT Sensor), P0115, P0116, P0117,
P0118 (ECT Sensor), P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135
(TP Sensor), P0125 (Insufficient ECT for Closed Loop), P0171, P0172 (Fuel
System), P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire), P0335
(CKP Sensor), P0340 (CMP Sensor), P0500 (VSS), P2196, P2198 (A/F Sensor
(Rationality)), P2A00, P2A03 (A/F Sensor (Slow Response))
Active air-fuel ratio control Performing
Active air-fuel ratio control is performed when the
following conditions are met:-
Battery voltage 11 V or more
Engine coolant temperature 75
C (167F) or more
Idle OFF
Engine RPM Less than 3200 rpm
A/F sensor status Activated
Fuel system status Closed loop
Fuel-cut OFF
Engine load 10 to 70%
Shift position 4th or more
Battery voltage 11 V or more
Estimated HO2S temperature Less than 700
C (1292F)
ECM monitor Completed
DTC P0606 Not set
Battery voltage 11 V or more
Estimated HO2S temperature 450
C (842F) or more
DTC P0606 Not set
Battery voltage 11 V or more
Time after engine start 2 seconds or more
Either of the following conditions is met: 1 or 2
1. All of the following conditions (a), (b) and (c) are met -
(a) Commanded air-fuel ratio 14.3 or less
(b) Rear HO2 sensor voltage 0.21 to 0.59 V
(c) OSC (Oxygen Storage Capacity of Catalyst) 2.0 g (0.0044 lb) or more
2. All of the following conditions (d), (f) and (g) are met. -
(d) Commanded air-fuel ratio 14.9 or more
(f) Rear HO2 sensor voltage 0.21 to 0.59 V
(g) OSC 2.0 g (0.0044 lb) or more
All of the following conditions (a), (b) and (c) are met. -
(a) Commanded air-fuel ratio 14.3 or less

ES–1762GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
CONFIRMATION DRIVING PATTERN
HINT:
• This confirmation driving pattern is used in steps 5, 8 and 11 of the following diagnostic troubleshooting
procedure when using the intelligent tester.
• Performing this confirmation pattern will activate the Heated Oxygen (HO2) sensor monitor. (The
catalyst monitor is performed simultaneously.) This is very useful for verifying the completion of a
repair.
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Turn the tester on.
4. Clear the DTCs (where set) (See page ES-39).
5. Select the following menu items: DIAGNOSIS / CARB OBD II / READINESS TESTS.
6. Check that O2S EVAL is INCMPL (incomplete).
7. Start the engine and warm it up (Procedure A).
8. Drive the vehicle at between 38 mph and 75 mph (60 km/h and 120 km/h) for at least 10 minutes
(Procedure B).
9. Note the state of the Readiness Tests items. Those items will change to COMPL (complete) as O2S
EVAL monitor operates.
10.On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO /
PENDING CODES and check if any DTCs (any pending DTCs) are set.
HINT:
If O2S EVAL does not change to COMPL, and any pending DTCs fail to set, extend the driving time.
A163945E04
A098191E04

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–179
ES
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read the DTCs.
Result
B
C
A
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / O2S
B1S2 or O2S B2S2.
(d) Allow the engine to idle.
(e) Read the Heated Oxygen (HO2) sensor output voltage
while idling.
Result
B
A
(a) Turn the ignition switch off and wait for 5 minutes.
(b) Disconnect the E9 or E10 ECM connectors.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(d) Reconnect the ECM connectors.
NG
Display (DTC Output) Proceed to
P0138 or P0158 A
P0137 or P0157 B
P0136 or P0156 C
Go to step 13
Go to step 6
2READ VALUE OF INTELLIGENT TESTER (OUTPUT VOLTAGE OF HEATED OXYGEN
SENSOR)
HO2 Sensor Output Voltages Proceed to
More than 1.2 V A
Less than 1.0 V B
Go to step 5
3CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
G035620E19
Tester Connection Specified Condition
HT1B (E9-1) - OX1B (E9-18) 10 k
or higher
HT2B (E10-5) - OX2B (E10-33) 10 k
or higher
Go to step 4

ES–1862GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the H14 or H9 HO2 sensor connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage
(d) Turn the ignition switch off.
(e) Disconnect the E9 and E10 ECM connectors.
(f) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Check for open
Check for short
(g) Reconnect the HO2 sensor connectors.
(h) Reconnect the ECM connectors.
16CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)
A162494E02
Tester Connection Specified Condition
+B (H14-2) - Body ground 9 to 14 V
+B (H9-2) - Body ground 9 to 14 V
Tester Connection Specified Condition
HT (H14-1) - HT1B (E9-1) Below 1
OX (H14-3) - OX1B (E9-18) Below 1
E1 (H14-4) - E2 (E9-28) Below 1
HT (H9-1) - HT2B (E10-5) Below 1
OX (H9-3) - OX2B (E10-33) Below 1
E1 (H9-4) - E2 (E9-28) Below 1
Tester Connection Specified Condition
HT (H14-1) or HT1B (E9-1) - Body ground 10 k
or higher
OX (H14-3) or OX1B (E9-18) - Body ground 10 k
or higher
E1 (H14-4) or E2 (E9-28) - Body ground 10 k
or higher
HT (H9-1) or HT2B (E10-5) - Body ground 10 k
or higher
OX (H9-3) or OX2B (E10-33) - Body ground 10 k
or higher
E1 (H9-4) or E2 (E9-28) - Body ground 10 k
or higher

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–189
ES
• When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and
the engine coolant temperature is more than 75
C [167F]), the system is functioning normally.
MONITOR DESCRIPTION
Under closed-loop fuel control, fuel injection volumes that deviate from those estimated by the ECM
cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when
there are persistent deviations in the short-term fuel trim values. Deviations from the ECM's estimated fuel
injection volumes also affect the average fuel trim learning value, which is a combination of the average
short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learning
value of the air-fuel ratio). If the average fuel trim learning value exceeds the malfunction thresholds, the
ECM interprets this as a fault in the fuel system and sets a DTC.
Example:
The average fuel trim learning value is more than +35% or less than -35%, the ECM interprets this as a
fuel system malfunction.
MONITOR STRATEGY
Related DTCsP0171: Fuel trim Lean (Bank 1)
P0172: Fuel trim Rich (Bank 1)
P0174: Fuel trim Lean (Bank 2)
P0175: Fuel trim Rich (Bank 2)
Required Sensors / Components (Main) Fuel system
Required Sensors / Components (Related) A/F sensor, Mass air flow meter, Crankshaft position sensor
Frequency of Operation Continuous
Duration Less than 10 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
A082386E30

ES–1922GR-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.
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 low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that
would cause the engine to run rich.
• A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that
would cause the engine to run lean.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read the DTCs.
Result
HINT:
If any DTCs other than P0171, P0172, P0174 or P0175
are output, troubleshoot those DTCs first.
B
A
OK:
PCV hose is connected correctly and is not damaged.
NG
OK
(a) Check the intake system for vacuum leakage.
OK:
No leakage from intake system.
NG
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174 OR
P0175)
Display (DTC Output) Proceed to
P0171, P0172, P0174 or P0175 A
P0171, P0172, P0174 or P0175 and other DTCs B
GO TO DTC CHART (See page ES-56)
2CHECK PCV HOSE CONNECTIONS
REPAIR OR REPLACE PCV HOSE
3CHECK INTAKE SYSTEM
REPAIR OR REPLACE INTAKE SYSTEM

ES–1942GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Lean: During A/F CONTROL, the A/F sensor output
voltage (AFS) is consistently more than 3.35 V, and the
HO2 sensor output voltage (O2S) is consistently less
than 0.4 V.
Rich: During A/F CONTROL, the AFS is consistently less
than 3.0 V, and the O2S is consistently more than 0.55 V.
Lean/Rich: During A/F CONTROL of the ACTIVE TEST,
the output voltage of the heated oxygen sensor
alternates correctly.
B
C
A
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY /
COOLANT TEMP.
(d) Read the COOLANT TEMP twice, when the engine is
both cold and warmed up.
Standard:
With cold engine:
Same as ambient air temperature.
With warm engine:
Between 75
C and 95C (167F and 203F)
NG
OK
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / MAF and
COOLANT TEMP.
(d) Allow the engine to idle until the COOLANT TEMP
reaches 75
C (167F) or more.
(e) Read the MAF with the engine in an idling condition and
at an engine speed of 2500 rpm.
Standard:
MAF while engine idling:
Between 1.8 g/s and 4.7 g/s (shift position: N, A/
C: OFF).
MAF at engine speed of 2500 rpm: Go to step 11
Go to step 15
5READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)
REPLACE ENGINE COOLANT
TEMPERATURE SENSOR (See page ES-516)
6READ VALUE OF INTELLIGENT TESTER (MAF)