2005 TOYOTA AVENSIS Service Repair Manual

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Page 4081 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A81699PIME2
E13
ECM Connector
123
A85679
VOUT
GND Wire Harness Side:
V1
Manifold Absolute Pressure Sensor
Connector
Front View
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−65
AVENSIS Supplement (RM1045E

Page 4082 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A80089
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
sensor
Platinum Hot Wire (Heater)
Temperature sensor
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−55
AVENSIS Supplemen

A80089
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
sensor
Platinum Hot Wire (Heater)
Temperature sensor
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−55
AVENSIS Supplement (RM1045E)
DTC P0100 MASS OR VOLUME AIR FLOW CIRCUIT
DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT
LOW INPUT
DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
The MAF (Mass Air Flow) meter measures 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 incom-
ing air cools the wire and an internal thermistor, changing their resistance. To maintain a constant current
value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is pro-
portional to the airflow through the sensor and the ECM interprets this voltage as the intake air amount.
The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with
the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.
DTC No.DTC Detection ConditionTrouble Area
P0100Open or short in mass air flow meter circuit for more than 3
seconds at engine speed of 4,000 rpm or lessSOpen or short in mass air flow meter circuit
SMass air flow meter
SECM
P0102Open or short in mass air flow meter circuit for more than 3
seconds at engine speed of 4,000 rpm or less
SOpen in mass air flow meter circuit
SShort in ground circuit
SMass air flow meter
SECM
P0103
Open in mass air flow meter circuit for more than 3 seconds
(EVG circuit) at engine speed of 4,000 rpm or less
Short in mass air flow meter circuit for more than 3 seconds
(+B circuit) at engine speed of 4,000 rpm or lessSOpen in mass air flow meter circuit (EVG circuit)
SShort in mass air flow meter circuit (+B circuit)
SMass air flow meter
SECM
05CJE−02

Page 4083 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A76863
B−Y
Battery FL MAINEngine Room R/B No. 4
L−Y EFI Relay
A6
Mass Air Flow MeterMREL
B−G 4B 1
W−BB−W 53
2
1
29
E13 8
E9ECM
EFI No. 2
EC 4A 1
Engine Room
J/B No. 4 1A 1
B−G 1 2
EFI 1
En

Page 4084 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A54396
+B (+)
Wire Harness Side:
A6
Front View
Mass Air Flow Meter Connector
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
05 −57
AVENSIS Supplement (RM 1045E)
1 READ VALUE OF HAND −HELD TESTER(MASS AI

Page 4085 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A76903
VG (+)
EVG (−)
E13ECM Connector
A54396
VG Wire Harness Side:E2G A6
Front View Mass Air Flow Meter Connector
A81699
VGE13ECM Connector
EVG
05−58
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS

Page 4086 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A54396
Wire Harness Side:+B (+)
A6
Front View
Mass Air Flow Meter Connector
A66053
Engine Room R/B No. 4:
EFI Relay
A76903
EVG
E13ECM Connector
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
05 −59
AVENSIS

Page 4087 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual A54396
VG Wire Harness Side:E2G A6
Front View Mass Air Flow Meter Connector
A81699
VGE13ECM Connector
EVG
05−60
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
7 CHECK HARNESS AND

Page 4088 of 5135

TOYOTA AVENSIS 2005 Service Repair Manual − DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−49
AVENSIS Supplement (RM1045E)
DTC P0031OXYGEN SENSOR HEATER CONTROL
CIRCUIT LOW (BANK1SENSOR1)
DTC P0032 OXYGEN SENSOR HEATER CONTROL
CIRCUIT HIGH (BANK1SE

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