BE6653
P24460
A00950
ON
HT1
HT2
(
−
)
(+)
−
DIAGNOSTICS
ENGINE
DI
−
47
1996 LAND CRUISER (RM451U)
DTC
P0135
Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 1)
DTC
P0141
Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page
DI
−
40
.
DTC No.
DTC Detecting Condition
Trouble Area
P0135
P0141
When the heater operates, heater current exceeds 2 A
(2 trip detection logic)
S
Open or short in heater circuit of heated oxygen sensor
S
Heated oxygen sensor heater
S
ECM
Heater current of 0.25 A or less when the heater operates
(2 trip detection logic)
HINT:
S
Sensor 1 refers to the sensor closer to the engine body.
S
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page
DI
−
40
for WIRING
DIAGRAM.
INSPECTION PROCEDURE
1
Check voltage between terminals HT1, HT2 of ECM connector and body ground.
PREPARATION:
(a)
Remove instrument panel speaker No.1 panel
(See page
SF
−
65
).
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals HT1, HT2 of ECM connec-
tor and body ground.
HINT:
S
Connect terminal HT1 to bank 1 sensor 1.
S
Connect terminal HT2 to bank 1 sensor 2.
OK:
Voltage: 9
−
14 V
OK
Check and replace ECM (See page
IN
−
28
).
NG
DI5PC
−
02
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Version 1.00 - 12/21/2010