A21411
A
B
B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
Sensor
Platinum Hot Wire (Heater)
Temperature Sensor
−
DIAGNOSTICS
ENGINE (1ZZ
−
FE)
DI
−
71
2005 CELICA (RM1131U)
DTC
P0100
Mass or Volume Air Flow Circuit
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 thermister, 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 air flow 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 the temperature sensor provides a bridge circuit,
with the power transistor controlled so that the potential of A and B remains equal to maintain the set temper-
ature.
DTC No.
DTC Detecting Condition
Trouble Area
P0100
Open or short in mass air flow meter circuit for
more than 3 sec. with 4,000 rpm or less engine
speed
S
Open or short in mass air flow meter circuit
S
Mass air flow meter
S
ECM
HINT:
After confirming DTC P0100, confirm the mass air flow ratio in the ”DIAGNOSIS / ENHANCED OBD ll / DATA
LIST / ALL” using the hand
−
held tester or the OBD ll scan tool.
Mass Air Flow Value (gm/sec.)
Malfunction
0.0
S
Mass air flow meter power source circuit open
S
VG circuit open or short
271.0 or more
S
E2G circuit open
DI09B
−
26
269
Содержание Celica 2005
Страница 72: ...PP0K9 10 PREPARATION IGNITION PP 21 2005 CELICA RM1131U EQUIPMENT Spark plug cleaner 71 ...
Страница 115: ...PP3Y3 02 PP 64 PREPARATION BRAKE 2005 CELICA RM1131U RECOMMENDED TOOLS 09082 00040 TOYOTA Electrical Tester 114 ...
Страница 134: ...PP0MW 04 PREPARATION BODY PP 83 2005 CELICA RM1131U LUBRICANT Item Capacity Classification MP grease 133 ...
Страница 219: ...A21571 DI 20 DIAGNOSTICS ENGINE 1ZZ FE 2005 CELICA RM1131U 218 ...
Страница 260: ... DIAGNOSTICS ENGINE 1ZZ FE DI 61 2005 CELICA RM1131U MEMO 259 ...
Страница 261: ...DI 62 DIAGNOSTICS ENGINE 1ZZ FE 2005 CELICA RM1131U MEMO 260 ...
Страница 400: ... DIAGNOSTICS ENGINE 1ZZ FE DI 201 2005 CELICA RM1131U MEMO 399 ...
Страница 512: ...A21571 DIAGNOSTICS ENGINE 2ZZ GE DI 313 2005 CELICA RM1131U 511 ...
Страница 699: ...DI 500 DIAGNOSTICS ENGINE 2ZZ GE 2005 CELICA RM1131U MEMO 698 ...
Страница 879: ...A21571 DI 680 DIAGNOSTICS AUTOMATIC TRANSAXLE U240E 2005 CELICA RM1131U 878 ...
Страница 880: ...A21572 A22718 A22768 DIAGNOSTICS AUTOMATIC TRANSAXLE U240E DI 681 2005 CELICA RM1131U 879 ...
Страница 881: ...A21573 DI 682 DIAGNOSTICS AUTOMATIC TRANSAXLE U240E 2005 CELICA RM1131U 880 ...
Страница 882: ...A21575 DIAGNOSTICS AUTOMATIC TRANSAXLE U240E DI 683 2005 CELICA RM1131U 881 ...
Страница 970: ...A21571 DIAGNOSTICS AUTOMATIC TRANSAXLE U341E DI 769 2005 CELICA RM1131U 969 ...
Страница 971: ...A21572 A22718 A22768 DI 770 DIAGNOSTICS AUTOMATIC TRANSAXLE U341E 2005 CELICA RM1131U 970 ...
Страница 972: ...A21573 DIAGNOSTICS AUTOMATIC TRANSAXLE U341E DI 771 2005 CELICA RM1131U 971 ...
Страница 973: ...A21575 DI 772 DIAGNOSTICS AUTOMATIC TRANSAXLE U341E 2005 CELICA RM1131U 972 ...
Страница 1599: ...SF0OF 13 B07709 ECM Cover ECM SF 78 SFI ENGINE CONTROL MODULE ECM 2005 CELICA RM1131U ENGINE CONTROL MODULE ECM COMPONENTS 1598 ...
Страница 2219: ...I13605 Door Courtesy Switches Fuel Sender Gauge BE 44 BODY ELECTRICAL COMBINATION METER 2005 CELICA RM1131U 2218 ...
Страница 2220: ...I11735 Connector A Connector B BODY ELECTRICAL COMBINATION METER BE 45 2005 CELICA RM1131U 2219 ...
Страница 2299: ...BE1DE 09 I25302 Antenna Assembly Audio Assembly BE 124 BODY ELECTRICAL ANTENNA 2005 CELICA RM1131U ANTENNA LOCATION 2298 ...
Страница 2308: ...V00012 Shape Example Removal Installation Removal Installation Removal Installation BO 2 BODY CLIP 2005 CELICA RM1131U 2307 ...
Страница 2314: ...BO2ND 07 BO 8 BODY HEADLIGHT 2005 CELICA RM1131U INSTALLATION Installation is in the reverse order of removal See page BO 6 2313 ...
Страница 2348: ...BO2NO 02 H12580 Roof Side Moulding BO 42 BODY ROOF SIDE MOULDING 2005 CELICA RM1131U ROOF SIDE MOULDING COMPONENTS 2347 ...
Страница 2352: ...BO1E6 06 H12582 Side Mud Guard 9 Clips BO 46 BODY SIDE MUD GUARD 2005 CELICA RM1131U SIDE MUD GUARD COMPONENTS 2351 ...
Страница 2483: ...I14013 Fan Motor Fan Shroud Fan Nut AIR CONDITIONING CONDENSER FAN AC 59 2005 CELICA RM1131U 2482 ...