Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di eg5vzfe cip0141
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DI-50
DIAGNOSTICS - ENGINE (5VZ-FE)
DI0S0-1 1
DTC P0141 Oxygen Sensor Heater Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-42 .
DTC No. DTC Detecting Condition Trouble Area
When heater operates, heater current exceeds 2.35 A
(2 trip detection logic) S Open or short in heater circuit of heated oxygen sensor
P0141 S H t d oxygen sensor heater
Heated h t
Heater current of 0.2 A or less when heater operates
S ECM
(2 trip detection logic)
HINT:
S Sensor 1 refer to the sensor closer to the engine body.
S Sensor 2 refer to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page DI-42 .
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 malfunctions is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check voltage between terminals HT2B of ECM connectors and body ground.
ON PREPARATION:
(a) Remove the glove compartment (See page SF-54 ).
HT2B (b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals HT2B of the ECM con-
nectors and body ground.
(+) (-) OK:
Voltage: 9 - 14 V
A15303
OK Check and replace ECM (See page IN-28 ).
NG
2002 4RUNNER (RM887U)
Author : Date : 226
DI-51
DIAGNOSTICS - ENGINE (5VZ-FE)
2 Check resistance of heated oxygen sensor heater (See page SF-52 ).
NG Replace heated oxygen sensor.
OK
Check and repair harness or connector between EFI main relay (Marking: EFI) and heated oxygen
sensor, and heated oxygen sensor and ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 227
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