Toyota Sequoia (2005). Manual — part 75
–
DIAGNOSTICS
ENGINE
DI–103
297
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
Approx. 0.0
Mass air flow meter power source circuit open
VG circuit open or short
271.0 or more
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
P0100
Mass air flow meter circuit range check
(Fluttering)
Related DTCs
P0102
Mass air flow meter circuit range check
(Low voltage)
P0103
Mass air flow meter circuit range check
(High voltage)
Required sensors/components
Mass air flow meter
Frequency of operation
Continuous
Duration
3 sec.
MIL operation
Immediate (When engine speed is at less than 4,000 rpm)
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 these
DTCs are not present
See page
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
F10
Fusible
Link
Block
A23554
ECM
VG
E2G
8
E4
30
E8
29
E8
B–W
R–W
2
B
IA4
14
Battery
B
2F
1
2D
1
Engine Room J/B
EFI No. 1
EFI Relay
EFI No. 2
5
3
1
2
2H
2A
2
G–R
J2
J/C
A
B
G–R
IG4
22
G–R
3
IA4
4
B–W
J16
J/C
6
B
W–B
G–R
A
A
J5
J/C
ED
+B
VG
MREL
M1
Mass Air Flow Meter
B–W
G–R
1
4
5
E2G
DI–104
–
DIAGNOSTICS
ENGINE
298
COMPONENT OPERATING RANGE
Parameter
Standard Value
Mass air flow meter voltage
0.4 to 2.2 V
WIRING DIAGRAM
–
DIAGNOSTICS
ENGINE
DI–105
299
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
C
Check for intermittent problems
(See page
A
A21226
Wire Harness Side:
+B
Mass Air Flow Meter Connector
M1
B17411
VG
E8
E2G
ECM Connector
DI–106
–
DIAGNOSTICS
ENGINE
300
2
Check voltage of mass air flow meter power source.
PREPARATION:
(a)
Disconnect the M1 mass air flow meter connector.
(b)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 1 of the mass air flow meter
connector and body ground.
OK:
Standard:
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.
CHECK:
Measure the voltage between the specified terminal of the E8
ECM connector.
HINT:
The shift position should be P or N and the A/C switch should
be turned OFF.
OK:
Standard:
Tester Connection
Condition
Specified Condition
VG (E8–30) –
E2G (E8–29)
Engine is idling
0.5 to 3.0 V
NG
Replace ECM (See page
NG
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