−
DIAGNOSTICS
ENGINE (2ZZ
−
GE)
DI
−
431
2005 CELICA (RM1131U)
DTC
P0134
Oxygen Sensor Circuit No Activity Detected
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0130 on page DI
−
411.
DTC No.
DTC Detecting Condition
Trouble Area
P0134
After engine is warmed up, heated oxygen sensor (bank 1
sensor 1) output does not indicate RICH (greater than 0.45 V)
even once when conditions (a), (b), (c), (d) and (e) continue for
more than 65 seconds (1 trip detection logic) :
(a) Engine speed: 1,400 rpm or more
(b) Vehicle speed: 24.8 mph (40 km/h) or more
(c) Throttle valve is not fully closed
(d) 180 seconds or more after starting engine
(e) Engine coolant temperature is more than 40
_
C (104
_
F)
S
Open or short in heated oxygen sensor (bank 1 sensor 1)
circuit
S
Heated oxygen sensor (bank 1 sensor 1)
S
Heated oxygen sensor heater (bank 1 sensor 1)
S
EFI relay
S
Air induction system
S
Fuel pressure
S
PCV hose connection
S
PCV valve and hose
S
Injector
S
Gas leakage in exhaust system
S
PCV piping
S
ECM
HINT:
S
Sensor 1 is the sensor closer to the engine body.
S
After confirming DTC P0134, check the output voltage of the heated oxygen sensor (bank 1 sensor
1) in the ”DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL” using the hand
−
held tester or the OBD
II scan tool. If the output voltage of the heated oxygen sensor is always less than 0.1 V, the sensor
circuit may be open or shorted.
MONITOR DESCRIPTION
The ECM uses the heated oxygen sensor to optimize the air
−
fuel mixture in closed
−
loop fuel control. This
control helps decrease exhaust emissions by providing the catalyst with a nearly stoichiometric mixture.
The sensor detects the oxygen level in the exhaust gas and the ECM uses this data to control the air
−
fuel
ratio. The sensor output voltage ranges from 0 V to 1 V. If the signal voltage is less than 0.4 V, the air
−
fuel
ratio is LEAN. If the signal voltage is more than 0.5 V, the air
−
fuel ratio is RICH. If the sensor does not indicate
RICH even once despite the conditions for the closed
−
loop fuel control being met and a specified time period
has passed, the ECM will conclude that the closed
−
loop fuel control is malfunctioning. The ECM will illumi-
nate the MIL and a DTC is set.
MONITOR STRATEGY
Related DTCs
P0134
Excessive time to enter closed
−
loop
Required sensors/components
Main sensors/components
Front heated oxygen sensor
Related sensors/components
Crankshaft position sensor, Engine coolant tem-
perature sensor, Vehicle speed sensor
Frequency of operation
Once per driving cycle
Duration
65 sec.
MIL operation
1 driving cycle
Sequence of operation
None
DIC7C
−
02
629
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