Lexus ES300 (1997 year). Manual — part 312
S06671
Engine Room J/B
EFI Relay
Junction
Connector
Fusible
Link
Block
From Ignition Switch
J23
Battery
FL
MAIN
EFI
2A
2K
2J
2F
B
B–R
EB
7
1
2
5
1
3
2
IGN
7
3
1W
1K
F8
F6
1
1
B–G
Junction
Connector
Mass Air
Flow Meter
B–Y
B–Y
B–Y
B–Y
W–B
R–B
ECM
E2G
VG
E2
E9
E8
P
4
J29
J28
B
B
IK3
9
4
A
A
5
3
8
7
Instrument Panel
J/B
DI–24
–
DIAGNOSTICS
ENGINE
176
1997 LEXUS ES300 (RM511U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Connect OBD II scan tool or LEXUS hand–held tester, and read value of mass air
flow rate.
PREPARATION:
(a)
Connect the OBD II scan tool or LEXUS hand–held tester to the DLC3.
(b)
Turn ignition switch ON and push the OBD II scan tool or LEXUS hand–held tester main switch ON.
(c)
Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or LEXUS hand–held tester.
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.
A00436
ON
4(+)
BE6653
S05337
S05699
VG(+)
–
DIAGNOSTICS
ENGINE
DI–25
177
1997 LEXUS ES300 (RM511U)
2
Check voltage of mass air flow meter power source.
PREPARATION:
(a)
Disconnect the mass air flow meter connector.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal 4 of mass air flow meter con-
nector and body ground.
OK:
Voltage: 9
∼
14 V
NG
Check for open in harness and connector
between EFI main relay (Marking: EFI) and
mass air flow meter (See page
OK
3
Check voltage between terminal VG of ECM connector and body ground.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Start the engine.
CHECK:
Measure voltage between terminal VG of ECM and body
ground while engine is idling.
OK:
Voltage:
1.1
∼
1.5 V (P or N position and A/C switch OFF)
OK
Check and replace ECM (See page
).
NG
P23859
E2G
DI–26
–
DIAGNOSTICS
ENGINE
178
1997 LEXUS ES300 (RM511U)
4
Check for open and short in harness and connector between mass air flow meter
and ECM (See page
).
NG
Repair or replace harness or connector.
OK
Replace mass air flow meter.
5
Check continuity between terminal E2G of ECM and body ground.
PREPARATION:
Remove the glove compartment (See page
).
CHECK:
Check continuity between terminal E2G of ECM connector and
body ground.
OK:
Continuity (1
Ω
or less)
NG
Check and replace ECM (See page
).
OK
6
Check for open in harness and connector between mass air flow meter and ECM
(See page
).
NG
Repair or replace harness or connector.
OK
Replace mass air flow meter.
–
DIAGNOSTICS
ENGINE
DI–27
179
1997 LEXUS ES300 (RM511U)
DTC
P0101
Mass Air Flow Circuit Range/Performance
Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100 (Mass Air Flow Circuit Malfunction) on page
DTC No.
DTC Detecting Condition
Trouble Area
P0101
Conditions (a), (b) and (c) continue 10 sec. or more with
engine speed 900 rpm or less:
(2 trip detection logic)
(a) Throttle valve fully closed
(b) Mass air flow meter output
2.2 V
(c) THW
>
70
°
C
Mass air flow meter
P0101
Conditions (a) and (b) continue 10 sec. or more with engine
speed 1,500 rpm or more:
(2 trip detection logic)
(a) VTA
0.63 V
(b) Mass air flow meter output
1.06 V
Mass air flow meter
WIRING DIAGRAM
Refer to DTC P0100 on page
INSPECTION PROCEDURE
1
Are there any other codes (besides DTC P0101) being output?
NO
Replace mass air flow meter.
YES
Go to relevant DTC chart.
DI09C–01
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