A06104
ON
HTS
(+)
(-)
DI-50
-
DIAGNOSTICS
ENGINE
204
Author:
Date:
2001 SIENNA (RM787U)
DTC
P0141
Heated Oxygen Sensor Heater Circuit Mal-
function (Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page
DTC No.
DTC Detecting Condition
Trouble Area
P0141
When heater operates, heater current exceeds 2.35 A
(2 trip detection logic)
Open or short in heater circuit of heated oxygen sensor
H
t d
h
t
P0141
Heater current of 0.2 A or less when heater operates
(2 trip detection logic)
Heated oxygen sensor heater
ECM
WIRING DIAGRAM
Refer to DTC P0125 on page
.
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
Check voltage between terminals HTS of ECM connectors and body ground.
PREPARATION:
(a)
Remove the glove compartment (See page
).
(b)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HTS of the ECM connec-
tors and body ground.
OK:
Voltage: 9 - 14 V
OK
Check and replace ECM (See page
).
NG
DI222-03
