TOYOTA SIENNA 2007 Service Repair Manual

2GR-FE ENGINE CONTROL SYSTEM – MASS AIR FLOW METERES–503
ES
ENGINE
2GR-FE ENGINE CONTROL SYSTEM
MASS AIR FLOW METER
COMPONENTS
A162193E01

ES–5042GR-FE ENGINE CONTROL SYSTEM – MASS AIR FLOW METER
ES
ON-VEHICLE INSPECTION
1. INSPECT MASS AIR FLOW METER
NOTICE:
• Perform the mass air flow (MAF) meter inspection
by following the procedures below.
• Only replace the MAF meter when the MAF value
in the DATA LIST (with the engine stopped) are
not within the normal operating range or there is
foreign matter on the MAF meter platinum hot
wire (heater).
(a) Read the values using the intelligent tester (MAF).
NOTICE:
• Perform the inspection with the vehicle
indoors and on a level surface.
• Perform the inspection of the MAF meter
while it is installed to the air cleaner case
(installed to the vehicle).
• During the test, do not use the exhaust air
duct to perform suction on the exhaust pipe.
(1) Turn the ignition switch to the ON position (do
not start the engine).
(2) Turn the tester on.
(3) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY /
PRIMARY / MAF.
(4) Wait 30 seconds, and read the values on the
intelligent tester.
Standard condition:
Less than 0.70 g/s
• If the result is not as specified, replace the
MAF meter.
• If the result is within the specified range,
inspect the cause of the extremely rich or
lean air fuel ratio.
REMOVAL
1. REMOVE MASS AIR FLOW METER
(a) Disconnect the mass air flow meter connector.
(b) Remove the 2 screws and mass air flow meter.
E144486E01
A162194

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–33
ES
TERMINALS OF ECM
1. SFI SYSTEM
HINT:
The standard normal voltage between each pair of the
ECM terminals is shown in the table below. The
appropriate conditions for checking each pair of the
terminals are also indicated.
The check results should be compared with the standard
normal voltage for that pair of terminals, listed in the
"Specified Condition" column.
The illustration above can be used as a reference to
identify the ECM terminal locations.
G035613E30
Symbols (Terminal No.) Wiring Colors Terminal Descriptions ConditionsSpecified
Condition
+B (E4-1) - E1 (E11-1) B-R - BR Power source of ECM Ignition switch ON 9 to 14 V
+B2 (E4-2) - E1 (E11-1) B-R - BR Power source of ECM Ignition switch ON 9 to 14 V
BATT (E4-3) - E1 (E11-1) B-W - BRBattery (for measuring the
battery voltage and for the
ECM memory)Always 9 to 14 V
VPMP (E4-5) - E1 (E11-1) W - BRVent valve operation
signal (built into pump
module)Ignition switch ON 9 to 14 V
MPMP (E4-6) - E1 (E11-1) G - BRVacuum pump operation
signal (built into pump
module)Vacuum pump OFF 0 to 3 V
MPMP (E4-6) - E1 (E11-1) G - BRVacuum pump operation
signal (built into pump
module)Vacuum pump ON 9 to 14 V
+BM (E4-7) - E1 (E11-1) R - BRPower source of ETCS
throttle motorAlways 9 to 14 V
MREL (E4-8) - E1 (E11-1) B-W - BR EFI relay operation signal Ignition switch ON 9 to 14 V
IGSW (E4-9) - E1 (E11-1) B-O - BRIgnition switch signal Ignition switch ON 9 to 14 V
FC (E4-10) - E1 (E11-1) V-G - BRC/OPEN relay operation
signal (fuel pump control)Ignition switch ON 9 to 14 V
STP (E4-15) - E1 (E11-1) G-W - BR Stop light switch signal Brake pedal depressed 7.5 to 14 V
STP (E4-15) - E1 (E11-1) G-W - BR Stop light switch signal Brake pedal released Below 1.5 V
ST1- (E4-16) - E1 (E11-1) LG-R - BRStop light switch signal
(opposite to STP terminal)Ignition switch ON, Brake pedal
depressedBelow 1.5 V
ST1- (E4-16) - E1 (E11-1) LG-R - BRStop light switch signal
(opposite to STP terminal)Ignition switch ON, Brake pedal
released7.5 to 14 V
VPA (E4-18) - EPA (E4-20) L-Y - R-BAccelerator pedal position
sensor signal (for engine
control)Ignition switch ON, Accelerator
pedal fully released0.5 to 1.1 V

ES–342GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
VPA (E4-18) - EPA (E4-20) L-Y - R-BAccelerator pedal position
sensor signal (for engine
control)Ignition switch ON, Accelerator
pedal fully depressed2.6 to 4.5 V
VPA2 (E4-19) - EPA2 (E4-21) W-R - LGAccelerator pedal position
sensor signal (for sensor
malfunction detection)Ignition switch ON, Accelerator
pedal fully released1.2 to 2.0 V
VPA2 (E4-19) - EPA2 (E4-21) W-R - LGAccelerator pedal position
sensor signal (for sensor
malfunction detection)Ignition switch ON, Accelerator
pedal fully depressed3.4 to 5.0 V
EPA (E4-20) - VPA (E4-18) R-B - L-YAccelerator pedal position
sensor signal (for engine
control)Ignition switch ON, Accelerator
pedal fully released0.5 to 1.1 V
EPA (E4-20) - VPA (E4-18) R-B - L-YAccelerator pedal position
sensor signal (for engine
control)Ignition switch ON, Accelerator
pedal fully depressed2.6 to 4.5 V
EPA2 (E4-21) - VPA2 (E4-19) LG - W-RAccelerator pedal position
sensor signal (for sensor
malfunction detection)Ignition switch ON, Accelerator
pedal fully released1.2 to 2.0 V
EPA2 (E4-21) - VPA2 (E4-19) LG - W-RAccelerator pedal position
sensor signal (for sensor
malfunction detection)Ignition switch ON, Accelerator
pedal fully depressed3.4 to 5.0 V
PPMP (E4-22) - E2 (E9-28) B - BRPressure sensor signal
(built into pump module)Ignition switch ON 3 to 3.6 V
TC (E4-23) - E1 (E11-1) P-B - BR Terminal TC of DLC3 Ignition switch ON 9 to 14 V
VCPA (E4-26) - EPA (E4-20) GR-R - R-BPower source of
accelerator pedal position
sensor (for VPA)Ignition switch ON 4.5 to 5.0 V
VCP2 (E4-27) - EPA2 (E4-21) B-R - LGPower source of
accelerator pedal position
sensor (for VPA2)Ignition switch ON 4.5 to 5.0 V
TACH (E5-1) - E1 (E11-1) B-O - BREngine speed signal (for
combination meter)IdlingPulse generation
(see waveform 11)
SPD (E5-8) - E1 (E11-1) V-W - BRVehicle speed signal from
combination meterIgnition switch ON, driving wheel
rotated slowlyPulse generation
(see waveform 8)
W (E5-30) - E1 (E11-1) B-Y - BRMalfunction Indicator
Lamp (MIL) operation
signalIgnition switch ON Below 3.0 V
W (E5-30) - E1 (E11-1) B-Y - BRMalfunction Indicator
Lamp (MIL) operation
signalIdling 9 to 14 V
CANH (E5-33) - CANL (E5-
34)B - WCAN communication
circuitIgnition switch off 54 to 69
CANL (E5-34) - CANH (E5-
33)W - BCAN communication
circuitIgnition switch off 54 to 69
E1 (E11-1) - Body ground BR - -Earth (ground) circuit of
ECMAlways Below 1 V
#10 (E11-2) - E01 (E9-7)
#20 (E11-3) - E01 (E9-7)
#30 (E11-4) - E01 (E9-7)
#40 (E11-5) - E01 (E9-7)
#50 (E11-6) - E01 (E9-7)
#60 (E11-7) - E01 (E9-7)L - W-B
R - W-B
B - W-B
W - W-B
B-W - W-B
G - W-BFuel injector operation
signalIgnition switch ON 9 to 14 V
#10 (E11-2) - E01 (E9-7)
#20 (E11-3) - E01 (E9-7)
#30 (E11-4) - E01 (E9-7)
#40 (E11-5) - E01 (E9-7)
#50 (E11-6) - E01 (E9-7)
#60 (E11-7) - E01 (E9-7)L - W-B
R - W-B
B - W-B
W - W-B
B-W - W-B
G - W-BFuel injector operation
signalIdlingPulse generation
(see waveform 3)
PSW (E11-10) - E1 (E11-1) R-W - BR P/S pressure switch signal Ignition switch ON 9 to 14 V Symbols (Terminal No.) Wiring Colors Terminal Descriptions ConditionsSpecified
Condition

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–35
ES
STAR (NSW) (E10-8) - E1
(E11-1)B-Y - BRPark/Neutral position
switch signalIgnition switch ON, Shift lever
position P or N9 to 14 V
STAR (NSW) (E10-8) - E1
(E11-1)B-Y - BRPark/Neutral position
switch signalIgnition switch ON, Shift lever
position other than P or N9 to 14 V
STA (E11-11) - E1 (E11-1) B-L - BRStarter relay operation
signalCranking 9 to 14 V
OC2- (E11-14) - OC2+ (E11-
15)G-B - L-RCamshaft timing Oil
Control Valve (OCV)
operation signal (Intake
side)Ignition switch ONPulse generation
(see waveform 1)
OE2+ (E11-27) - OE2- (E11-
32)W - G-RCamshaft timing Oil
Control Valve (OCV)
operation signal (Intake
side)Ignition switch ONPulse generation
(see waveform 1)
OC1- (E11-16) - OC1+ (E11-
17)G-R - G-WCamshaft timing Oil
Control Valve (OCV)
operation signal (Intake
side)Ignition switch ONPulse generation
(see waveform 1)
OE1+ (E11-26) - OE1- (E11-
31)G - RCamshaft timing Oil
Control Valve (OCV)
operation signal (Intake
side)Ignition switch ONPulse generation
(see waveform 1)
VV2+ (E11-18) - VV2- (E11-
28)V - GVariable Valve Timing
(VVT) sensor signal
(Intake side)IdlingPulse generation
(see waveform 5)
VV1+ (E11-19) - VV1- (E11-
29)B-W - L-YVariable Valve Timing
(VVT) sensor signal
(Intake side)IdlingPulse generation
(see waveform 5)
NE- (E11-20) - NE+ (E11-21) B - WCrankshaft position sensor
signalIdlingPulse generation
(see waveform 5)
NE+ (E11-21) - NE- (E11-20) W - BCrankshaft position sensor
signalIdlingPulse generation
(see waveform 5)
EV2- (E11-22) - EV2+ (E11-
23)R - PVariable Valve Timing
(VVT) sensor signal
(Exhaust side)IdlingPulse generation
(see waveform 5)
EV2+ (E11-23) - EV2- (E11-
22)P - RVariable Valve Timing
(VVT) sensor signal
(Exhaust side)IdlingPulse generation
(see waveform 5)
EV1- (E11-24) - EV1+ (E11-
25)L-W - B-WVariable Valve Timing
(VVT) sensor signal
(Exhaust side)IdlingPulse generation
(see waveform 5)
EV1+ (E11-25) - EV1- (E11-
24)B-W - L-WVariable Valve Timing
(VVT) sensor signal
(Exhaust side)IdlingPulse generation
(see waveform 5)
VV2- (E11-28) - VV2+ (E11-
18)G - VVariable Valve Timing
(VVT) sensor signal
(Intake side)IdlingPulse generation
(see waveform 5)
VV1- (E11-29) - VV1+ (E11-
19)L-Y - B-WVariable Valve Timing
(VVT) sensor signal
(Intake side)IdlingPulse generation
(see waveform 5)
HT1B (E9-1) - E1 (E11-1)
HT2B (E10-5) - E1 (E11-1)L - BR
W-L - BRHeated oxygen sensor
heater operation signalIdling Below 3.0 V
HT1B (E9-1) - E1 (E11-1)
HT2B (E10-5) - E1 (E11-1)L - BR
W-L - BRHeated oxygen sensor
heater operation signalIgnition switch ON 9 to 14 V
ACM (E9-3) - E1 (E11-1) Y-G - BRVSV for active control
mount system operation
signalIgnition switch ON 9 to 14 V
M- (E9-4) - ME01 (E10-3) W - W-BThrottle drive motor
operation signal (negative
terminal)Idling with warm enginePulse generation
(see waveform 10) Symbols (Terminal No.) Wiring Colors Terminal Descriptions ConditionsSpecified
Condition

ES–362GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
M+ (E9-5) - ME01 (E10-3) B - W-BThrottle drive motor
operation signal (positive
terminal)Idling with warm enginePluse generation
(see waveform 9)
E02 (E9-6) - Body ground W-B - -Earth (ground) circuit of
ECMAlways Below 1 V
E01 (E9-7) - Body ground W-B - -Earth (ground) circuit of
ECMAlways Below 1 V
IGT1 (E9-8) - E1 (E11-1)
IGT2 (E9-9) - E1 (E11-1)
IGT3 (E9-10) - E1 (E11-1)
IGT4 (E9-11) - E1 (E11-1)
IGT5 (E9-12) - E1 (E11-1)
IGT6 (E9-13) - E1 (E11-1)R-L - BR
P - BR
Y- B - B R
L-Y - BR
G-Y - BR
L-R - BRIgnition coil with igniter
(ignition signal)IdlingPulse generation
(see waveform 6)
GE01 (E9-17) - E1 (E11-1) - - BRShielded earth (ground)
circuit of throttle drive
motorAlways Below 1 V
OX1B (E9-18) - E2 (E9-28)
OX2B (E10-33) - E2 (E9-28)W - BR
B - BRHeated oxygen sensor
signalWith engine speed at 2500 rpm
for 2 minutes after warming upPulse generation
(see waveform 2)
VTA2 (E9-19) - E2 (E9-28) B-R - BRThrottle position sensor
signal (for sensor
malfunction detection)Ignition switch ON, Accelerator
pedal fully released2.1 to 3.1 V
VTA2 (E9-19) - E2 (E9-28) B-R - BRThrottle position sensor
signal (for sensor
malfunction detection)Ignition switch ON, Accelerator
pedal fully depressed4.5 to 5.0 V
VTA1 (E9-20) - E2 (E9-28) LG - BRThrottle position sensor
signal (for engine control)Ignition switch ON, Throttle valve
fully closed0.5 to 1.2 V
VTA1 (E9-20) - E2 (E9-28) LG - BRThrottle position sensor
signal (for engine control)Ignition switch ON, Throttle valve
fully open3.2 to 4.8 V
THW (E9-21) - E2 (E9-28) G-B - BREngine coolant
temperature sensor signalIdling, Engine coolant
temperature 80
C (176F)0.2 to 1.0 V
THA (E9-22) - E2 (E9-28) L-B - BRIntake air temperature
sensor signalIdling, Intake air temperature
20
C (68F)0.5 to 3.4 V
VC (E9-23) - E2 (E9-28) Y - BRPower source of sensors
(specific voltage)Ignition switch ON 4.5 to 5.0 V
IGF1 (E9-24) - E1 (E11-1) W-R - BRIgnition coil with igniter
(ignition confirmation
signal)Ignition switch ON 4.5 to 5.0 V
IGF1 (E9-24) - E1 (E11-1) W-R - BRIgnition coil with igniter
(ignition confirmation
signal)IdlingPulse generation
(see waveform 6)
AICV (E9-27) - E1 (E11-1) W - BRVSV for Air intake control
system operation signalIgnition switch ON 9 to 14 V
E2 (E9-28) - E1 (E11-1) BR - BREarth (ground) circuit of
sensors for ETCSAlways Below 1 V
E2G (E9-29) - E1 (E11-1) L-W - BREarth (ground) circuit of
sensor for mass air flow
meterAlways Below 1 V
VG (E9-30) - E2G (E9-29) R - L-WMass Air Flow (MAF)
meter signalIdling, Shift lever position P or N,
A/C switch OFF0.5 to 3.0 V
ACIS (E9-33) - E1 (E11-1) R-Y - BRVSV for ACIS (Acoustic
Control Induction System)
operation signalIgnition switch ON 9 to 14 V
PRG (E9-34) - E1 (E11-1) G - BRPurge VSV for EVAP
system operation signalIgnition switch ON 9 to 14 V
PRG (E9-34) - E1 (E11-1) G - BRPurge VSV for EVAP
system operation signalIdlingPulse generation
(see waveform 7)
HA2A (E10-1) - E05 (E10-6) Y - W-BA/F sensor heater
operation signalIdling Below 3.0 V Symbols (Terminal No.) Wiring Colors Terminal Descriptions ConditionsSpecified
Condition

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–37
ES
*1: The ECM terminal voltage is constant regardless of
the output voltage from the sensor.
(a) WAVEFORM 1
(1) Camshaft Timing Oil Control Valve (OCV)
operation signal
HINT:
The wavelength becomes shorter as the engine
rpm increases.
HA2A (E10-1) - E05 (E10-6) Y - W-BA/F sensor heater
operation signalIgnition switch ON 9 to 14 V
HA1A (E10-2) - E04 (E10-7) B-W - W-BA/F sensor heater
operation signalIdling Below 3.0 V
HA1A (E10-2) - E04 (E10-7) B-W - W-BA/F sensor heater
operation signalIgnition switch ON 9 to 14 V
ME01 (E10-3) - E1 (E11-1) W-B - BREarth (ground) circuit of
ECMAlways Below 1 V
E03 (E10-4) - E1 (E11-1) W-B - BREarth (ground) circuit of
ECMAlways Below 1 V
HT2B (E10-5) - E1 (E11-1)
HT1B (E9-1) - E1 (E11-1)W-L - BR
L - BRHeated oxygen sensor
heater operation signalIdling Below 3.0 V
HT2B (E10-5) - E1 (E11-1)
HT1B (E9-1) - E1 (E11-1)W-L - BR
L - BRHeated oxygen sensor
heater operation signalIgnition switch ON 9 to 14 V
E05 (E10-6) - E1 (E11-1) W-B - BREarth (ground) circuit of
ECMAlways Below 1 V
E04 (E10-7) - E1 (E11-1) W-B - BREarth (ground) circuit of
ECMAlways Below 1 V
EKN2 (E10-20) - KNK2 (E10-
21)G - REarth (ground) circuit of
knock sensorWith engine speed at 4000 rpm
after warming upPulse generation
(see waveform 4)
KNK2 (E10-21) - EKN2 (E10-
20)R - G Knock sensor signalWith engine speed at 4000 rpm
after warming upPulse generation
(see waveform 4)
A1A+ (E10-22) - E1 (E11-1) BR - BR A/F sensor signal Ignition switch ON
3.3 V
*1
A1A+ (E10-22) - E1 (E11-1) BR - BR A/F sensor signal Ignition switch ON
3.0 V*1
A2A+ (E10-23) - E1 (E11-1) P - BR A/F sensor signal Ignition switch ON
3.3 V*1
A2A+ (E10-23) - E1 (E11-1) P - BR A/F sensor signal Ignition switch ON
3.0 V*1
EKNK (E10-28) - KNK1 (E10-
29)W - BEarth (ground) circuit of
knock sensorWith engine speed at 4000 rpm
after warming upPulse generation
(see waveform 4)
KNK1 (E10-29) - EKNK (E10-
28)B - W Knock sensor signalWith engine speed at 4000 rpm
after warming upPulse generation
(see waveform 4)
A1A- (E10-30) - E1 (E11-1) Y - BR A/F sensor Ignition switch ON
3.3 V
*1
A1A- (E10-30) - E1 (E11-1) Y - BR A/F sensor Ignition switch ON
3.0 V*1
A2A- (E10-31) - E1 (E11-1) L - BR A/F sensor Ignition switch ON
3.3 V*1
A2A- (E10-31) - E1 (E11-1) L - BR A/F sensor Ignition switch ON
3.0 V*1
OX2B (E10-33) - E2 (E9-28)
OX1B (E9-18) - E2 (E9-28)B - BR
W - BRHeated oxygen sensor
signalWith engine speed at 2500 rpm
for 2 minutes after warming upPulse generation
(see waveform 2) Symbols (Terminal No.) Wiring Colors Terminal Descriptions ConditionsSpecified
Condition
A093229E14
ECM Terminal NamesBetween OC1+ and OC1- , OC2+ and OC2- , OE1+
and OE1- , or OE2+ and OE2-
Tester Ranges 5 V/DIV, 1 msec./DIV
Conditions Idling

ES–382GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(b) WAVEFORM 2
(1) Heated oxygen sensor signal
HINT:
In the DATA LIST, item O2S B1S2 shows the
ECM input values from the heated oxygen
sensor.
(c) WAVEFORM 3
(1) Fuel injector operation signal
HINT:
The wavelength becomes shorter as the engine
rpm increases.
(d) WAVEFORM 4
(1) Knock sensor signal
HINT:
• The wavelength becomes shorter as the
engine rpm increases.
• The waveforms and amplitudes displayed
differ slightly depending on the vehicle.
(e) WAVEFORM 5
(1) Variable Valve Timing (VVT) sensor signal (1)
(2) Crankshaft position sensor signal (2)
HINT:
The wavelength becomes shorter as the engine
rpm increases.
A088863E16
ECM Terminal Names Between OX1B and E2, or OX2B and E2
Tester Ranges 0.2 V/DIV, 200 msec./DIV
ConditionsEngine speed is maintained at 2500 rpm for 2
minutes after sensor is warmed up
G035622E04
ECM Terminal Names Between #10 (to 60) and E01
Tester Ranges 30 V/DIV, 20 msec./DIV
Conditions Idling
A085286E30
ECM Terminal Names Between KNK1 and EKNK, or KNK2 and EKN2
Tester Ranges 0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
ConditionsEngine speed is maintained at 4000 rpm after engine
is warmed up
G035795E29
ECM Terminal Names(1) Between VV1+ and VV1- , VV2+ and VV2-, EV1+
and EV1-, or EV2+ and EV2-
(2) Between NE+ and NE-
Tester Ranges 5 V/DIV, 20 msec./DIV
Conditions Idling

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–39
ES
(f) WAVEFORM 6
(1) Igniter IGT signal (from ECM to igniter) (1)
(2) Igniter IGF signal (from igniter to ECM) (2)
HINT:
The wavelength becomes shorter as the engine
rpm increases.
(g) WAVEFORM 7
(1) Purge VSV for EVAP system operation signal
HINT:
If the waveform is not similar to that shown in the
illustration, check the waveform again after idling
for 10 minutes or more.
(h) WAVEFORM 8
(1) Vehicle speed signal
HINT:
• The wavelength becomes shorter as the
vehicle speed increases.
• Depending on the vehicle, the output
waveform voltage may rise to 12 V if
influenced by optionally installed systems.
(i) WAVEFORM 9
(1) Throttle drive motor operation signal (positive
terminal)
HINT:
The duty ratio varies depending on the throttle
actuator operation.
G035664E06
ECM Terminal Names(1) Between IGT (1 to 6) and E1
(2) Between IGF1 and E1
Tester Ranges 2 V/DIV, 20 msec./DIV
Conditions Idling
G042964E01
ECM Terminal Names Between PRG and E1
Tester Ranges 10 V/DIV, 50 msec./DIV
Conditions Idling
A093224E14
ECM Terminal Names Between SPD and E1
Tester Ranges 2 V/DIV, 20 msec./DIV
Conditions Driving at 12 mph (20 km/h)
A093274E16
ECM Terminal Names Between M+ and ME01
Tester Ranges 5 V/DIV, 1 msec./DIV
Conditions Idling with warm engine

ES–402GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(j) WAVEFORM 10
(1) Throttle drive motor operation signal (negative
terminal)
HINT:
The duty ratio varies depending on the throttle
actuator operation.
(k) WAVEFORM 11
(1) Engine speed signal
HINT:
The wavelength becomes shorter as the engine
rpm increases.
A093275E15
ECM Terminal Names Between M- and ME01
Tester Ranges 5 V/DIV, 1 msec./DIV
Conditions Idling with warm engine
A093225E12
ECM Terminal Names Between TACH and E1
Tester Ranges 5 V/DIV, 10 msec./DIV
Conditions Idling