Lexus ES300 (1997 year). Manual — part 318
P18349
DI–48
–
DIAGNOSTICS
ENGINE
200
1997 LEXUS ES300 (RM511U)
3
Check output voltage of heated oxygen sensor during idling.
PREPARATION:
Warm up the heated oxygen sensor with the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Use the OBD II scan tool or LEXUS hand–held tester read the output voltage of the heated oxygen sensor
during idling.
OK:
Heated oxygen sensor output voltage:
Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the following table).
OK
Perform confirmation driving pattern
(See page
).
NG
Replace heated oxygen sensor.
DI–50
–
DIAGNOSTICS
ENGINE
202
1997 LEXUS ES300 (RM511U)
DTC
P0135
Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 1)
DTC
P0141
Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 2)
DTC
P0155
Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page
DTC No.
DTC Detecting Condition
Trouble Area
P0135
P0141
When the heater operates, heater current exceeds 2 A
(2 trip detection logic)
Open or short in heater circuit of heated oxygen sensor
H
t d
h
t
P0141
P0155
Heater current of 0.2 A or less when the heater operates
(2 trip detection logic)
Heated oxygen sensor heater
ECM
HINT:
Bank 1 refers to the bank that includes cylinder No.1.
Bank 2 refers to the bank that does not include cylinder No.1.
Sensor 1 refers to the sensor closer to the engine body.
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page
for the WIRING DIAGRAM.
DI09L–01
A00220
ON
HTR(+)
HTL(+) HTS(+)
BE6653
S04160
–
DIAGNOSTICS
ENGINE
DI–51
203
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals HTR, HTS, HTL of ECM connectors and body
ground.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals HTR, HTS, HTL of ECM
connectors and body ground.
HINT:
Connect terminal HTR to bank 1 sensor 1.
Connect terminal HTS to bank 1 sensor 2.
Connect terminal HTL to bank 2 sensor 1.
OK:
Voltage: 9
∼
14 V
OK
Check and replace ECM (See page
).
NG
2
Check resistance of heated oxygen sensor heater (See page
NG
Replace heated oxygen sensor.
OK
Check and repair harness or connector between EFI main relay (Marking: EFI), heated oxygen
sensor and ECM (See page
).
DI–52
–
DIAGNOSTICS
ENGINE
204
1997 LEXUS ES300 (RM511U)
DTC
P0136
Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page
DTC No.
DTC Detecting Condition
Trouble Area
P0136
Voltage output of the heated oxygen sensor (bank 1 sensor 2)
remains at 0.4 V or more or 0.5 V or less when the vehicle is
driven at 50 km/h (31 mph) or more after the engine is warmed
up
(2 trip detection logic)
Heated oxygen sensor
HINT:
Bank 1 refers to the bank that includes cylinder No.1. Sensor 2 refers to the sensor farther away from
the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page
INSPECTION PROCEDURE
1
Are there any other codes (besides DTC P0136) being output?
YES
Go to relevant DTC chart.
NO
2
Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page
).
NG
Repair or replace harness or connector.
OK
DI09M–01
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