DI–49
DIAGNOSTICS – ENGINE
DI385–03
DTC P0130 Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI–44.
DTC No. DTC Detecting Condition Trouble Area
S Open or short in heated oxygen sensor circuit
S Heated oxygen sensor
Voltage output of oxygen sensor remains at 0.4 V or more, or S Air induction system
P0130 0.55 V or less, during idling after the engine is warmed up (2 S EGR system
trip detection logic) S Fuel pressure
S Injector
S ECM
HINT:
Sensor 1 refers to the sensor closer to the engine body.
The oxygen sensor's output voltage and the short-term fuel trim value can be read using the
OBD II scan tool or TOYOTA hand-held tester.
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI–44 for the WIR-
ING DIAGRAM.
2000 CELICA (RM744U)
DI–50
DIAGNOSTICS – ENGINE
CONFIRMATION DRIVING PATTERN
Vehicle speed 20 sec. 20 sec. 20 sec.
or more or more or more
40 km/h
(24 mph) (4) (4) (4)
Idling (3) (5) (5) (6)
IG SW OFF
(1) (2) 100 sec. 20 sec. 20 sec.
30 sec.
or more or more or more
A09299
(1) Connect the TOYOTA hand–held tester to the DLC3.
(2) Switch the TOYOTA hand–held tester from normal mode to check mode (See page DI–3).
(3) Start the engine and let the engine idle for 100 sec. or more.
(4) Drive the vehicle at 40 km/h (24 mph) or more for 20 sec. or more.
(5) Let the engine idle for 20 sec. or more.
(6) Let the engine idle for 30 sec.
HINT:
If a malfunction exists, the MIL will light up during step (6).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a TOYOTA hand–held tester, turn the ignition switch OFF after performing steps
(3) to (6), then perform steps (3) to (6) again.
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 Are there any other codes (besides DTC P0130) being output?
YES Go to relevant DTC chart.
NO
2000 CELICA (RM744U)
DI–51
DIAGNOSTICS – ENGINE
2 Check the output voltage of oxygen sensor during idling.
PREPARATION:
Warm up the oxygen sensor the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Use the OBD II scan tool or TOYOTA hand–held tester read the output voltage of the oxygen sensor during
idling.
OK:
Oxygen sensor output voltage:
Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the Following table).
P18349
OK Perform confirmation driving pattern
(See page DI–49).
NG
3 Check for open and short in harness and connector between ECM and oxygen
sensor (bank 1 sensor 1) (See page IN–20).
NG Repair or replace harness or connector.
OK
4 Check air induction system (See page SF–1).
NG Repair or replace induction system.
OK
2000 CELICA (RM744U)
DI–52
DIAGNOSTICS – ENGINE
5 Check fuel pressure (See page SF–6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF–1).
OK
6 Check injector injection (See page SF–22).
NG Replace injector.
OK
Replace oxygen sensor (bank 1 sensor 1).
7 Perform confirmation driving pattern (See page DI–49).
Go
8 Are there DTC P0130 being output again?
YES Check for intermittent problems
(See page DI–3).
NO
Check and replace ECM.
2000 CELICA (RM744U)
