Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip0100
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DI-22
DIAGNOSTICS - ENGINE
DI6UV-05
CIRCUIT INSPECTION
DTC P0100 Mass Air Flow Circuit Malfunction
CIRCUIT DESCRIPTION
The mass air flow meter uses a platinum hot wire. The hot wire air flow meter consists of a platinum hot wire,
thermistor and a control circuit installed in a plastic housing. The hot wire air flow meter works on the principle
that the hot wire and thermistor located in the intake air bypass of the housing detect any changes in the
intake air temp.
The hot wire is maintained at the set temp. by controlling the current flow through the hot wire. This current
flow is then measured as the output voltage of the air flow meter.
The circuit is constructed so that the platinum hot wire and thermistor provide a bridge circuit,with the power
transistor controlled so that the potential of A and B remains equal to maintain the set temp.
B+
Thermister
Power Transister
Platinum Hot wire
A B
Output
Voltage
FI6929
S05741 A06106
DTC No. DTC Detecting Condition Trouble Area
S Open or short in mass air flow meter circuit
Open or short in mass air flow meter circuit with more than 3
P0100 S Mass air flow meter
sec. engine speed 4,000 rpm or less
S ECM
If the ECM detects DTC "P0100" it operates the fail-safe function, keeping the ignition timing and injection
volume constant and making it possible to drive the vehicle.
HINT:
After confirming DTC P0100 use the OBD II scan tool or TOYOTA hand-held tester to confirm the mass air
flow ratio from "CURRENT DATA".
Mass Air Flow Value (gm/sec.) Malfunction
S Mass air flow meter power source circuit open
0.0
S VG circuit open or short
271.0 or more S E2G circuit open
2002 ECHO (RM884U)
Author : Date : 192
DI-23
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
I10 Instrument Panel J/B
Ignition Switch
6 3
W-R B-R
1O 1A
5 AM2 IG2 6
B-R
1O 1 Instrument ECM
Panel J/B B-Y
1A 7
W-R Engine
1 1
1 1 Room
2 2 1 5 R/B No. 1
Engine
EFI
AM2 EFI Room
R/B No. 1 Relay
1 1 2 3
M1
1 1 1 Mass Air Flow Meter
2
B-L P VG
F6 2 E6
B-Y 3
Fusible 4 B-Y 10
Link Block W-B V EVG
MAIN EB1 E6
1 2
Battery
EC
A09136 A14310
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Connect OBD II scan tool or TOYOTA hand-held tester, and read value of mass
air flow rate.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the OBD II scan tool or TOYOTA hand-held tester main switch ON.
(c) Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or TOYOTA hand-held tester.
2002 ECHO (RM884U)
Author : Date : 193
DI-24
DIAGNOSTICS - ENGINE
RESULT:
Type I Type II
Mass air flow rate (gm/sec.) 0.0 271.0 or more
Type I Go to step 2.
Type II Go to step 5.
2 Check voltage of mass air flow meter power source.
PREPARATION:
ON (a) Disconnect the mass air flow meter connector.
(b) Turn ignition switch ON.
CHECK:
3 (+) Measure voltage between terminal 4 of mass air flow meter con-
nector and body ground.
OK:
Voltage: 9 - 14 V
BE6653
A01589 A01588
NG Check for open in harness and connector
between EFI main relay (Marking: EFI) and
mass air flow meter (See page IN-29 ).
OK
3 Check voltage between terminal VG of ECM connector and body ground.
PREPARATION:
START (a) Remove the connector cover from the ECM.
VG (+)
(b) Start the engine.
CHECK:
Measure voltage between terminal VG of ECM and body
ground while engine is idling.
OK:
Voltage:
BE6653 P23805 A09417 1.1 - 1.5 V (P or N position and A/C switch OFF)
OK Check and replace ECM (See page IN-29 ).
NG
2002 ECHO (RM884U)
Author : Date : 194
DI-25
DIAGNOSTICS - ENGINE
4 Check for open and short in harness and connector between mass air flow meter
and ECM (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
5 Check continuity between terminal EVG of ECM connector and body ground.
EVG
PREPARATION:
Remove the connector cover from the ECM.
CHECK:
Check continuity between terminal EVG of ECM connector and
body ground.
OK:
Continuity (1 or less)
A09033
NG Check and replace ECM (See page IN-29 ).
OK
6 Check for open in harness and connector between mass air flow meter and ECM
(See page IN-29 ).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
2002 ECHO (RM884U)
Author : Date : 195
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