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DI-522
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRC-01
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 Mass Air Flow (MAF) 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, affecting 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. 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.
B+
Temperature Sensor
Power Transistor
Platinum Hot Wire
A B Output
Voltage
Temperature Sensor
Platinum Hot Wire
FI6929
A09074 A09707
DTC No. DTC Detection Condition Trouble Area
Open or short in mass air flow meter circuit for more than 3
P0100
sec.
Open or short in mass air flow meter circuit for more than 3
P0102 S Open or short in mass air flow meter circuit
sec.
S Mass air flow meter
Open in mass air flow meter circuit for more than 3 sec. (EVG S ECM
circuit)
P0103
Short in mass air flow meter circuit for more than 3 sec. (+B
circuit)
DI-523
DIAGNOSTICS - ENGINE (2UZ-FE)
HINT:
After confirming DTC P0100, P0102 or P0103, use the hand-held tester or the OBD II scan tool to confirm
the MAF ratio from the ALL menu (to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST
/ ALL).
Mass Air Flow Value (gm/sec.) Malfunction
S Mass air flow meter power source circuit open
Approx. 0.0
S VG circuit open or short
271.0 or more S EVG circuit open
MONITOR DESCRIPTION
If there is a defect in the MAF (Mass Air Flow) meter or an open or short circuit, the voltage level will deviate
outside the normal operating range. The ECM interprets this deviation as a defect in the MAF meter and sets
a DTC.
Example:
When the MAF meter voltage output is less than 0.2 V, or more than 4.9 V, and if either the condition contin-
ues for more than 3 sec.
MONITOR STRATEGY
Mass air flow meter circuit range check
P0100
(Fluttering)
Mass air flow meter circuit range check
Related DTCs P0102
(Low voltage)
Mass air flow meter circuit range check
P0103
(High voltage)
Required sensors/components Mass air flow meter
Frequency of operation Continuous
Duration 3 sec.
Immediate (When engine speed is at less than 4,000 rpm)
MIL operation
2 driving cycles (When engine speed is at 4,000 rpm or more)
Sequence of operation None
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is
See page DI-437
not present
The typical enabling condition is not avail-
-
able
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P0100:
Mass air flow meter voltage Less than 0.2 V, or more than 4.9 V
P0102:
Mass air flow meter voltage Less than 0.2 V
P0103:
Mass air flow meter voltage More than 4.9 V
DI-524
DIAGNOSTICS - ENGINE (2UZ-FE)
COMPONENT OPERATING RANGE
Parameter Standard Value
Mass air flow meter voltage 0.4 to 2.2 V
WIRING DIAGRAM
Access Cab, Standard Cab:
Engine Room R/B ECM
EFI Relay 9 J/C 26 8
W-B GR-G GR-G
2 2 J26 J27 E3 MREL
2 1
B-R
2 2 M1
5 3 W-L Mass Air Flow Meter
Engine Room R/B J1 30
R R-Y
2 J/C +B VG E7 VG
EFI No. 2 1 3
Engine Room R/B
B B
2 2
2 W-L
2 1 29
B-Y
EFI E2G 2 E7 E2G
No. 1 R
1 J8
J/C J/C
7 24 22
2 R R
A J26 J27 IE1
J18 A A
J/C B-L (*1)
A B (*2)
W-B
*1: Towing Packege
EA Battery *2: Except Towing Package
A23603
DI-525
DIAGNOSTICS - ENGINE (2UZ-FE)
Double Cab:
ECM
11 8
B-W IA10 B-W
E3 MREL
M1 Mass Air Flow Meter
2 J/C 22 30
A C
R R R +B R-Y
IA4 J47 J48 IE1 VG 3 E7 VG
1
R 29
Engine Room J/B B-Y
E2G E7 E2G
2
2 EFI No. 2 EFI Relay EFI No. 1 1
2A 2D
3 5
6 1
2H 2F
2 1 W-B
W-B
F13
Fusible Link Block A
J34
B
10 J/C
12
A
B
W-B
Battery EA
A23604
DI-526
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Connect hand-held tester, and read value of mass air flow rate.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand-held tester main switch ON.
(c) Start the engine.
(d) When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / MAF.
CHECK:
Read the mass air flow rate on the hand-held tester.
RESULT:
Air Flow Rate (gm/s) Proceed to
0.0 A
271.0 or more B
Between 1 and 270.0 (*1) C
*1: The value must change when the throttle valve is opened or closed.
B Go to step 3.
C Check for intermittent problems
(See page DI-430).
A
DI-527
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check voltage of mass air flow meter power source.
PREPARATION:
Wire Harness Side:
(a) Disconnect the M1 mass air flow meter connector.
Mass Air Flow Meter Connector
(b) Turn the ignition switch ON.
M1 CHECK:
Measure voltage between terminal 1 of the mass air flow meter
connector and body ground.
OK:
+B Standard:
A21226 Tester Connection Specified Condition
+B (M1-1) - Body ground 9 to 14 V
NG Go to step 5.
OK
3 Check voltage between terminal VG of ECM connector and body ground.
PREPARATION:
Start the engine.
E7 ECM Connector CHECK:
Measure the voltage between the specified terminal of the E7
ECM connector.
HINT:
The shift position should be P or N and the A/C switch should
VG E2G be turned OFF.
B17411 OK:
Standard:
Tester Connection Condition Specified Condition
VG (E7-30) -
Engine is idling 0.5 to 3.0 V
E2G (E7-29)
OK Replace ECM (See page SF-82).
NG
DI-528
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check for open and short in harness and connector between mass air flow meter
and ECM.
Wire Harness Side:
PREPARATION:
(a) Disconnect the M1 mass air flow meter connector.
Mass Air Flow Meter Connector
(b) Disconnect the E7 ECM connector.
M1 CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
E2G VG Standard:
A21226 Tester Connection Specified Condition
VG (M1-3) - VG (E7-30) Below 1
E7 ECM Connector E2G (M1-2) - E2G (E7-29) Below 1
VG (M1-3) or VG (E7-30) -
10 k or higher
Body ground
E2G
VG B17412
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
DI-529
DIAGNOSTICS - ENGINE (2UZ-FE)
5 Check for open and short in harness and connector between mass air flow meter
and EFI relay.
Engine Room J/B: PREPARATION:
Remove the EFI No. 2 fuse from the engine room J/B.
CHECK:
Check the resistance in the EFI No. 2 fuse.
OK:
Standard:
EFI
Below 1
No. 2 Fuse
A21375
Wire Harness Side: PREPARATION:
(a) Install the EFI No. 2 fuse.
Mass Air Flow Meter Connector
(b) Disconnect the M1 mass air flow meter connector.
M1 (c) Remove the EFI relay from the engine room J/B.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
+B
A21226 Standard:
Tester Connection Specified Condition
Engine Room J/B: +B (M1-1) - Engine Room J/B (EFI
Below 1
relay terminal 1)
+B (M1-1) or Engine room J/B (EFI relay
10 k or higher
terminal 1) - Body ground
EFI Relay
NG Repair or replace harness or connector.
A21376
OK
Check ECM power source circuit
(See page DI-918).
DI-530
DIAGNOSTICS - ENGINE (2UZ-FE)
6 Check continuity between terminal E2G of ECM connector and body ground.
CHECK:
E7 ECM Connector
Check the resistance between terminal of the E7 ECM connec-
tor and body ground.
OK:
Standard:
Tester Connection Specified Condition
E2G (E7-29) - Body ground Below 1
E2G
B17412
NG Replace ECM (See page SF-82).
OK
7 Check for open in harness and connector between mass air flow meter and ECM.
Wire Harness Side: PREPARATION:
(a) Disconnect the M1 mass air flow meter connector.
Mass Air Flow Meter Connector
(b) Disconnect the E7 ECM connector.
M1 CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
E2G VG Standard:
A21226 Tester Connection Specified Condition
VG (M1-3) - VG (E7-30) Below 1
E7 ECM Connector E2G (M1-2) - E2G (E7-29) Below 1
VG (M1-3) or VG (E7-30) -
10 k or higher
Body ground
E2G (M1-2) or E2G (E7-29) -
10 k or higher
Body ground
E2G
VG B17412
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
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