2001 TOYOTA SEQUOIA Service Repair Manual

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Page 297 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±103
297 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
After confirming DTC P0100, P0102 or P0103, use the hand±held tester or the OBD II scan tool to confirm
the MAF ratio f

Page 298 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F10
Fusible
Link
Block
A23554
ECM
VG
E2G 8
E4
30
E8
29
E8 B±W R±W
2
B IA414
BatteryB 2F1 2D1 Engine Room J/B
EFI No. 1 EFI Relay
EFI No. 2
5
3
1
2 2H2A2G±R J2
J/C
A
B G±R
IG422
G±R
3 IA44B±W
J

Page 299 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±105
299 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions

Page 300 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A21226
Wire Harness Side:
+B
Mass Air Flow Meter Connector
M1
B17411
VGE8E2G
ECM Connector
DI±106
± DIAGNOSTICSENGINE
300 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check voltage of mass air flow me

Page 301 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A21226
Wire Harness Side:
Mass Air Flow Meter Connector
M1
E2GVG
B17412
E8ECM Connector
E2G
VG
± DIAGNOSTICSENGINE
DI±107
301 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short in h

Page 302 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A21375
Engine Room J/B:
EFI
No. 2 Fuse
A21226
Wire Harness Side:
Mass Air Flow Meter Connector
M1
+B
A21376
Engine Room J/B:
EFI Relay
DI±108
± DIAGNOSTICSENGINE
302 Author: Date:
2005 SEQUOIA

Page 303 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17412E2G E8
ECM Connector
A21226
Wire Harness Side:
Mass Air Flow Meter Connector
M1
VGE2G
B17412
E8ECM Connector
E2G
VG
± DIAGNOSTICSENGINE
DI±109
303 Author: Date:
2005 SEQUOIA (RM1146U)
6 Ch

Page 304 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±110
± DIAGNOSTICSENGINE
304 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0101 Mass or Volume Air Flow Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100, P0102 and P0103 o

DI±110
± DIAGNOSTICSENGINE
304 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0101 Mass or Volume Air Flow Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100, P0102 and P0103 on page DI±102.
DTC No.DTC Detecting ConditionTrouble Area
P0101
After engine is warmed up, conditions (a), (b), (c) and (d) con-
tinue for more than 10 seconds:
(2 trip detection logic)
(a) Throttle valve fully closed
(b) Voltage output of the mass air flow meter is more than 2.2
V.
(c) Engine coolant temperature is more than 70 °C (158 °F).
(d) Engine speed is less than 2,000 rpm.
Mass air flow meter
Conditions (a), (b) and (c) continue for more than 10 seconds
at engine speed: (2 trip detection logic)
(a) Engine speed is more than 300 rpm.
(b) Voltage output of the mass air flow meter is less than 1.0 V.
MONITOR DESCRIPTION
The MAF (Mass Air Flow) meter helps the ECM calculate the amount of air flowing through the throttle valve.
The ECM uses this information to determine the fuel injection time and provide a proper air fuel ratio. Inside
the MAF meter, there is a heated platinum wire exposed to the flow of intake air. By applying a specific current
to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an
internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the volt-
age applied to these components in the MAF meter. The voltage level is proportional to the air flow through
the MAF meter. The ECM interprets this voltage as the intake air amount. If there is a defect in the MAF meter
or an open or short circuit, the voltage level will deviate outside the normal operating range. The ECM inter-
prets this deviation as a defect in the MAF meter and sets a DTC.
Example:
If the voltage is more than 2.2 V at idle or less than 1.0 V at idle OFF, the ECM interprets this as a defect
in the MAF meter and sets a DTC.
MONITOR STRATEGY
RltdDTCP0101Mass air flow meter rationality (Low voltage)Related DTCsP0101Mass air flow meter rationality (High voltage)
Main sensors/componentsMass air flow meter
Required sensors/componentsRelated sensors/componentsEngine speed sensor, Engine coolant tempera-
ture sensor, Throttle position sensor
Frequency of operationContinuous
Duration10 sec.
MIL operation2 driving cycles
Sequence of operationNone
DI3HM±13

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