Toyota 2GR-FE Manual page 339

MONITOR STRATEGY
Related DTCs
Required Sensors/Components (Main)
Required Sensors/Components (Sub)
Frequency of Operation
Duration
MIL Operation
Sequence of Operation
TYPICAL ENABLING CONDITIONS
All:
Monitor runs whenever following DTCs are not present
HO2S voltage (P0136, P0156), HO2S low voltage (P0137, P0157), HO2S high voltage (P0138,
P0158):
Active A/F control
Battery voltage
ECT
Idle
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
• DTCs P0136 and P0156 indicate the deterioration of
• DTCs P0137 and P0157 indicate an open or short
the HO2 sensor. The ECM sets the DTCs by
calculating the impedance of the sensor when the
typical enabling conditions are satisfied (1 driving
cycle).
circuit in the HO2 sensor (1 driving cycle). The ECM
sets the DTCs when the impedance of the sensor
exceeds the threshold of 15 kΩ.
P0136: HO2S voltage (Bank 1)
P0136: HO2S low impedance (Bank 1)
P0137: HO2S high impedance (Bank 1)
P0137: HO2S low voltage (Bank 1)
P0138: HO2S high voltage (Bank 1)
P0138: HO2S high voltage (Extremely high) (Bank 1)
P0156: HO2S voltage (Bank 2)
P0156: HO2S low impedance (Bank 2)
P0157: HO2S high impedance (Bank 2)
P0157: HO2S low voltage (Bank 2)
P0158: HO2S high voltage (Bank 2)
P0158: HO2S high voltage (Extremely high) (Bank 2)
HO2S
Crankshaft position sensor, Engine coolant temperature sensor, Mass
air flow meter, Throttle position sensor
Once per driving cycle
20 seconds: HO2S voltage (P0136, P0156), HO2S low voltage
(P0137, P0157), HO2S high voltage (P0138, P0158)
30 seconds: HO2S low impedance (P0136, P0156)
90 seconds: HO2S high impedance (P0137, P0157)
10 seconds: HO2S high voltage (P0138, P0158)
2 driving cycles
None
P0031, P0032, P0051, P0052 (A/F sensor heater - Sensor 1)
P0037, P0038, P0057, P0058 (O2 Sensor Heater - Sensor 2)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for Closed Loop)
P0171, P0172 (Fuel system)
P0300 - P0308 (Misfire)
P0335 (CKP sensor)
P0340, P0341 (CMP sensor)
P0442 - P0456 (EVAP system)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2A00, P2A03 (A/F sensor - slow response)
Performing
11 V or more
75 °C (167°F) or more
OFF
ES–183
ES