Lexus ES300 (2002 year). Manual — part 385
A53763
IGF
E2
A54406
E10
IGT1
E2
+B
IGF IGT GND
A50294
05-146
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
299
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
INSPECT ECM
(a)
Disconnect the ignition coil connector.
(b)
Turn the ignition switch ON
(c)
Measure voltage between the terminals IGF and E2 of the
ECM connector.
Voltage: 4.5 - 5.5 V
OK
CHECK AND REPLACE ECM
NG
CHECK AND REPLACE ECM
4
CHECK HARNESS AND CONNECTOR(ECM - IGNITION COIL)
HINT:
The procedure below is for No.1 cylinder. If a malfunction is
found on the other cylinders, check the circuit for the cylinder
with referring to this procedure.
(a)
Disconnect the ignition coil connector.
(b)
Disconnect the ECM E10 connector.
(c)
Check for open between the terminals IGT1 of the ECM
connector and IGT of the ignition coil connector.
Resistance: 1
Ω
or less
(d)
Check for short between the terminals IGT1 and E2 of the
ECM connector.
Resistance: 1 M
Ω
or less
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
A53763
IGT1
E2
IGT2
IGT3
IGT4
IGT5
IGT6
A31764
A53763
IGT1
E2
IGT2
IGT3
IGT4
IGT5
IGT6
+B
IGF IGT GND
A50294
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-147
300
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
5
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminals IGT1 - IGT6 and
E2 of the ECM connector when the engine is cranked.
Voltage: More than 0.1 V and less than 4.5 V
HINT:
During cranking or idling, check the waveform between termi-
nals IGT1 - IGT6 and E2 of the ECM connector.
Item
Contents
Terminal
CH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 - E2
CH2: IGF - E2
Equipment Set
2V/DIV, 20ms/DIV
Condition
While the engine is cranking or idling
HINT:
Correct waveform appears as shown, with rectangle waves.
NG
CHECK AND REPLACE ECM
OK
6
INSPECT ECM
(a)
Disconnect the ignition coil with the igniter connector.
(b)
Turn the ignition switch ON.
(c)
Measure the voltage between terminals IGT1 - IGT6 and
E2 of the ECM connector when the engine is cranked.
Voltage: More than 0.1 V and less than 4.5 V
NG
CHECK AND REPLACE ECM
OK
7
CHECK IGNITION COIL ASSY(POWER SOUSE CIRCUIT)
(a)
Disconnect the ignition coil with the igniter connector.
(b)
Turn the ignition switch ON.
(c)
Measure voltage between terminals+B and GND of the
ignition coil with the igniter connector.
Voltage: 9 - 14 V
+B
IGF IGT GND
A50294
1
5
6
2
3
7
8
4
A56879
IG2
05-148
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
301
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
NG
REPAIR OR REPLACE POWER SOURCE
OK
8
CHECK HARNESS AND CONNECTOR(IGUNITION SWITCH - IGNITION COIL)
(a)
Disconnect the ignition coil with the igniter connector.
(b)
Disconnect the ignition switch connector.
(c)
Check open between the terminals +B of the ignitioncoil
with igniter connector and IG2 of the ignition switch.
Resistance: 1
Ω
or less
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE IGNITION COIL ASSY
051MZ-08
05-18
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
171
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DIAGNOSTIC TROUBLE CODE CHART
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for the codes listed
in the table below. For details of each code, turn to the page referred to under the ’’See page ’’ for the respec-
tive ’’DTC No.’’ in the DTC chart.
SAE CONTROLLED
DTC No.
(See Page)
Detection Item
Trouble Area
MIL
*1
Memory
P0100
Mass Air Flow Circuit Malfunc-
tion
Open or short in intake air flow meter circuit
Intake air flow meter
ECM
P0101
Mass Air Flow Circuit Range/
Performance Problem
Intake air flow meter
P0110
Intake Air Temp. Circuit Malfunc-
tion
Open or short in intake air temp. sensor circuit
Intake air temp. sensor (inside intake air flow meter)
ECM
P0115
Engine Coolant Temp. Circuit
Malfunction
Open or short in E.F.I. engine coolant temp. sensor circuit
E.F.I. engine coolant temp. sensor
ECM
P0116
Engine Coolant Temp. Circuit
Range/Performance Problem
Cooling system
E.F.I. engine coolant temp. sensor
P0120
Throttle/Pedal Position Sensor/
Switch ”A” Circuit Malfunction
Open or short in throttle position sensor circuit
Throttle position sensor
ECM
P0121
Throttle/Pedal Position Sensor/
Switch ”A” Circuit Range/Perfor-
mance Problem
Throttle body assy (Throttle position sensor)
ECM
P0125
Insufficient Coolant Temp. for
Closed Loop Fuel Control
Open or short in A/F sensor (bank 1, 2 sensor 1) circuit
A/F sensor (bank 1, 2 sensor 1)
Air induction system
Fuel pressure
Injector
Gas leakage on exhaust system
PCV hose connection
ECM
P0128
Thermostat Malfunction
Thermostat
Cooling system
E.F.I. engine coolant temp. sensor
ECM
P0136
Heated Oxygen Sensor Circuit
Malfunction (Bank 1 Sensor 2)
Open or short in heated oxygen sensor circuit
Oxygen sensor
P0141
Heated Oxygen Sensor Circuit
Malfunction (Bank 1 Sensor 2)
Open or short in heater circuit of heated oxygen sensor
Oxygen sensor heater
ECM
P0156
Heated Oxygen Sensor Circuit
Malfunction (Bank 2 Sensor 2)
Same as DTC No. P0136
P0161
Heated Oxygen Sensor Circuit
Malfunction (Bank 2 Sensor 2)
Same as DTC No. P0141
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