Lexus ES300 (1997 year). Manual — part 311
DI–20
–
DIAGNOSTICS
ENGINE
172
1997 LEXUS ES300 (RM511U)
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
IGF (E10
12)
IG switch ON
4.5
∼
5.5
IGF (E10 – 12)
– E1 (E8 – 16)
W–R
↔
BR
Idling
Pulse generation
THG (E8 – 14) – E2 (E9 – 22)
G–Y
↔
BR
IG switch ON
4.5
∼
5.5
G22+ (E9 – 17)
– NE– (E9 – 6)
B–W
↔
L
Idling
Pulse generation
NE+ (E9 – 5)
– NE– (E9 – 6)
B–R
↔
L
Idling
Pulse generation
ELS (E7
3)
E1 (E8
16)
G O
BR
Taillight switch ON
7.5
∼
14
ELS (E7 – 3) – E1 (E8 – 16)
G–O
↔
BR
Taillight switch OFF
0
∼
1.5
ELS2 (E7
2)
E1 (E8
16)
B Y
BR
Defogger switch ON
7.5
∼
14
ELS2 (E7 – 2) – E1 (E8 – 16)
B–Y
↔
BR
Defogger switch OFF
0
∼
1.5
EGR (E8 – 12)
– E01 (E10 –34)
Y–G
↔
BR
IG switch ON
9
∼
14
ACIS (E8 – 6)
– E01 (E10 – 34)
R–G
↔
BR
IG switch ON
9
∼
14
FC (E9
18)
E1 (E8
16)
G R
BR
IG switch ON
9
∼
14
FC (E9 – 18) – E1 (E8 – 16)
G–R
↔
BR
Idling
0
∼
3.0
EVP1 (E8 – 2)
– E01 (E10 – 34)
LG
↔
BR
IG switch ON
9
∼
14
RSC (E10 – 22)
– E01 (E10 – 34)
Y–B
↔
BR
IG switch ON
Disconnect E10 of ECM connector
9
∼
14
RSO (E10 – 23)
– E01 (E10 – 34)
R–W
↔
BR
IG switch ON
Disconnect E10 of ECM connector
9
∼
14
OXR1 (E9 – 13)
– E1 (E8 – 16)
W
↔
BR
Maintain engine speed at 2,500 rpm for 2 min. after
warming up
Pulse generation
OXL1 (E9 – 19)
– E1 (E8 – 16)
B
↔
BR
Maintain engine speed at 2,500 rpm for 2 min. after
warming up
Pulse generation
OXS (E7 – 18)
– E1 (E8 – 16)
B
↔
BR
Maintain engine speed at 2,500 rpm for 2 min. after
warming up
Pulse generation
HTL (E8– 10)
Y R
BR
Idling
Below 3.0
HTL (E8 10)
– E03 (E10 – 28)
Y–R
↔
BR
IG switch ON
9
∼
14
HTR (E8 – 11)
L B
BR
Idling
Below 3.0
HTR (E8 11)
– E03 (E10 – 28)
L–B
↔
BR
IG switch ON
9
∼
14
HTS (E7 – 17)
P B
BR
Idling
Below 3.0
HTS (E7 17)
– E03 (E10 –28)
P–B
↔
BR
IG switch ON
9
∼
14
KNKR (E9 – 15)
– E1 (E8 – 16)
W
↔
BR
Idling
Pulse generation
KNKL (E9 – 14)
– E1 (E8 – 16)
W
↔
BR
Idling
Pulse generation
NSW (E10 – 14)
B W
BR
IG switch ON
Other shift position in ”P” ,”N” position
9
∼
14
NSW (E10 14)
– E1 (E8 – 16)
B–W
↔
BR
IG switch ON
Shift position in ”P” ,”N” position
0
∼
3.0
SPD (E7 – 12)
– E1 (E8 – 16)
V–W
↔
BR
IG switch ON
Rotate driving wheel slowly
Pulse generation
TC (E8 – 5) – E1 (E8 – 16)
L–W
↔
BR
IG switch ON
9
∼
14
–
DIAGNOSTICS
ENGINE
DI–21
173
1997 LEXUS ES300 (RM511U)
Symbols (Terminals No.)
Wiring Color
Condition
STD Voltage (V)
W (E8 – 3) – E1 (E8 – 16)
G–R
↔
BR
IG switch ON
Below 3.0
PS (E10 – 31) – E1 (E8 – 16)
B
↔
L
IG switch ON
9
∼
14
ACT (E7
5)
E1 (E8
16)
B Y
BR
A/C switch OFF
Below 2.0
ACT (E7 – 5) – E1 (E8 – 16)
B–Y
↔
BR
A/C switch ON at idling
9
∼
14
A/C (E7
16)
E1 (E8
16)
LG W
BR
A/C switch ON at idling
Below 2.0
A/C (E7 – 16) – E1 (E8 – 16)
LG–W
↔
BR
A/C switch OFF
9
∼
14
CF (E8
9)
E1 (E8
16)
G W
BR
Electric cooling fan is operating on high speed
9
∼
14
CF (E8 – 9) – E1 (E8 – 16)
G–W
↔
BR
Electric cooling fan is operating on low speed or OFF
0
∼
2
TACH (E7 – 13)
– E1 (E8–16)
B–O
↔
BR
Idling
Pulse generation
TPC (E8 – 8)
– E1 (E8 – 16)
W–R
↔
BR
IG switch ON
Disconnect the vacuum hose from the vapor pressure sensor
9
∼
14
IG switch ON
3.0
∼
3.6
PTNK (E8 – 13) – E1 (E8 – 16)
L–R
↔
BR
IG switch ON
Apply vacuum 2.0 kPa (15 mmHg, 0.6 in.Hg)
1.3
∼
2.1
SIL (E7 – 8) – E1 (E8 – 16)
W
↔
BR
During transmission
Pulse generation
STP (E7
24)
E1 (E8
16)
G W
BR
IG switch ON
Brake pedal depressed
7.5
∼
14
STP (E7 – 24) – E1 (E8 – 16)
G–W
↔
BR
IG switch ON
Brake pedal released
Below 1.5
EGLS (E8
15)
E1 (E8
16)
W G
BR
IG switch ON
Apply vacuum (0 kPa, 0 mmHg, 0 in.Hg) to EGR valve
0.4
∼
1.6
EGLS (E8 – 15) – E1 (E8 – 16)
W–G
↔
BR
IG switch ON
Apply vacuum (17.3 kPa, 130 mmHg, 5.12 in.Hg) to EGR valve
3.2
∼
5.1
DI09A–01
DI–22
–
DIAGNOSTICS
ENGINE
174
1997 LEXUS ES300 (RM511U)
PROBLEM SYMPTOMS TABLE
Symptom
Suspect Area
See page
Engine does not crank (Does not start)
1. Starter and starter relay
No initial combustion (Does not start)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)
No complete combustion (Does not start)
1. Fuel pump control circuit
Engine cranks normally (Difficult to start)
1. Starter signal circuit
2. Fuel pump control circuit
3. Compression
Cold engine (Difficult to start)
1. Starter signal circuit
2. Fuel pump control circuit
Hot engine
1. Starter signal circuit
2. Fuel pump control circuit
High engine idle speed (Poor idling)
1. A/C signal circuit (Compressor circuit)
2. ECM power source circuit
Low engine idle speed (Poor idling)
1. A/C signal circuit (Compressor circuit)
2. Fuel pump control circuit
Rough idling (Poor idling)
1. Compression
2. Fuel pump control circuit
Hunting (Poor idling)
1. ECM power source circuit
2. Fuel pump control circuit
Hesitation/Poor acceleration (Poor driveability)
1. Fuel pump control circuit
2. A/T faulty
Surging
1. Fuel pump control circuit
Soon after starting (Engine stall)
1. Fuel pump control circuit
During A/C operation (Engine stall)
1. A/C signal circuit (Compressor circuit)
2. Engine control module (ECM)
DI09B–01
A00435
B+
Thermister
Power Transister
Platinum Hot wire
B
Output
Platinum Hot
Wire
A
Voltage
Thermister
FI6929
S05741
–
DIAGNOSTICS
ENGINE
DI–23
175
1997 LEXUS ES300 (RM511U)
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.
DTC No.
DTC Detecting Condition
Trouble Area
P0100
Open or short in mass air flow meter circuit with more than 3
sec. engine speed 4,000 rpm or less
Open or short in mass air flow meter circuit
Mass air flow meter
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 LEXUS hand–held tester to confirm the mass
air flow ratio from ”CURRENT DATA”.
Mass Air Flow Value (gm/sec.)
Malfunction
0.0
Mass air flow meter power source circuit open
VG circuit open or short
271.0 or more
E2G circuit open
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