Toyota Tundra. Manual — part 1177
The impedance cannot be measured using an ohmmeter.
DTCs P0136 and P0156 indicate the deterioration of the HO2 sensor. The ECM sets the DTCs by
calculating the impedance of the sensor when the typical enabling conditions are satisfied (2
driving cycles).
DTCs P0137 and P0157 indicate an open or short circuit in the HO2 sensor (2 driving cycles). The
ECM sets the DTCs when the impedance of the sensor exceeds the threshold 15 kohms.
Fig. 82: High Or Low Impedance Of Heated Oxygen (HO2) Sensor
5. HO2 sensor output voltage fuel cut (P0139 or P0159)
The sensor voltage drops below 0.2 V (extremely lean status) immediately when the vehicle decelerates
and fuel cut is operating. If the voltage does not drop below 0.2 V, the ECM determines that the sensor
response feature has deteriorated, illuminates the MIL and stores DTC (s).
MONITOR STRATEGY
MONITOR STRATEGY
Related DTCs
P0136: Heated oxygen sensor output voltage (Output voltage) (bank 1)
P0136: Heated oxygen sensor impedance (Low) (bank 1)
P0137: Heated oxygen sensor output voltage (Low voltage) (bank 1)
P0137: Heated oxygen sensor impedance (High) (bank 1)
P0138: Heated oxygen sensor output voltage (High voltage) (bank 1)
P0138: Heated oxygen sensor output voltage (Extremely high) (bank 1)
P0139: Heated oxygen sensor output voltage during fuel cut (bank 1)
P0156: Heated oxygen sensor output voltage (Output voltage) (bank 2)
P0156: Heated oxygen sensor impedance (Low) (bank 2)
P0157: Heated oxygen sensor output voltage (Low voltage) (bank 2)
P0157: Heated oxygen sensor impedance (High) (bank 2)
P0158: Heated oxygen sensor output voltage (High voltage) (bank 2)
P0158: Heated oxygen sensor impedance (Extremely high) (bank 2)
P0159: Heated oxygen sensor output voltage during fuel cut (bank 2)
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
TYPICAL ENABLING CONDITIONS
All:
TYPICAL ENABLING CONDITIONS
Heated Oxygen Sensor Output Voltage (Output Voltage, High Voltage and Low Voltage)
TYPICAL ENABLING CONDITIONS
Required Sensors/Components
(Main)
Heated oxygen sensor
Required Sensors/Components
(Related)
Crankshaft position sensor, engine coolant temperature sensor, mass air
flow meter and throttle position sensor
Frequency of Operation
Once per driving cycle: Active air-fuel ratio control detection
Continuous: Other
Duration
20 seconds: Heated oxygen sensor output (Output voltage, High
voltage, Low voltage)
30 seconds: Heated oxygen sensor impedance (Low)
90 seconds: Heated oxygen sensor impedance (High)
10 seconds: Heated oxygen sensor voltage (Extremely high)
9 seconds: Heated oxygen sensor voltage (During fuel cut)
MIL Operation
2 driving cycles
Sequence of Operation
None
Monitor runs whenever following DTCs not
present
P0031, P0032, P0051, P0052 (A/F sensor heater -
Sensor 1)
P0037, P0038, P0057, P0058 (O2 sensor heater - Sensor
2)
P0102, P0103 (MAF meter)
P0110, P0112, P0113 (IAT sensor)
P0115 - P0118(ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (VVT sensor)
P0455, P0456 (EVAP System)
P0500 (VSS)
P2196, P2198 (A/F sensor - rationality)
P2A00, P2A03 (A/F sensor - slow response)
Active air-fuel ratio control
Executing
Active air-fuel ratio control begins when all of following conditions met:
-
Battery voltage
11 V or more
Engine coolant temperature
75°C (167°F) or more
Idling
OFF
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
Heated Oxygen Sensor Impedance (Low)
TYPICAL ENABLING CONDITIONS
Heated Oxygen Sensor Impedance (High)
TYPICAL ENABLING CONDITIONS
Heated Oxygen Sensor Output Voltage (Extremely High)
TYPICAL ENABLING CONDITIONS
Heated Oxygen Sensor Output Voltage during fuel cut:
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Output Voltage (Output voltage)
TYPICAL MALFUNCTION THRESHOLDS
Engine RPM
Less than 3200 RPM
A/F sensor status
Activated
Fuel system status
Closed loop
Fuel cut
OFF
Engine load
10 to 80%
Shift position
4th or more
Battery voltage
11 V or more
Estimated sensor temperature
Less than 700°C (1292°F)
ECM monitor
Completed
DTC P0606
Not set
Battery voltage
11 V or more
Estimated sensor temperature
520 to 750°C (968 to 1382°F) or higher
DTC P0606
Not set
Battery voltage
11 V or more
Time after engine start
2 seconds or more
Engine coolant temperature
75°C (167°F) or higher
Estimated catalyst temperature
400°C (752°F) or higher
Fuel cut
ON
Either of following conditions met:
1 or 2
1. All of following conditions (a), (b) and (c) met
-
(a) Commanded air-fuel ratio
14.3 or less
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
Heated Oxygen Sensor Output Voltage (Low output voltage)
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Output Voltage (High output voltage)
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Impedance (Low)
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Impedance (High)
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Output Voltage (Extremely High)
TYPICAL MALFUNCTION THRESHOLDS
Heated Oxygen Sensor Output Voltage during fuel cut:
(b) Rear HO2 sensor voltage
0.21 to 0.59 V
(c) OSC (Oxygen Storage Capacity of Catalyst)
2.5 g or more
2. All of following conditions (d), (e) and (f) met
-
(d) Commanded air-fuel ratio
14.9 or more
(e) Rear HO2 sensor voltage
0.21 to 0.59 V
(f) OSC
2.5 g or more
All of following conditions (a), (b) and (c) met
-
(a) Commanded air-fuel ratio
14.3 or less
(b) Rear HO2 sensor voltage
Less than 0.21 V
(c) OSC (Oxygen Storage Capacity of Catalyst)
2.5 g or more
All of following conditions (a), (b) and (c) met
-
(a) Commanded air-fuel ratio
14.9 or more
(b) Rear HO2 sensor voltage
More than 0.59 V
(c) OSC (Oxygen Storage Capacity of Catalyst)
2.5 g or more
Duration of following condition
30 seconds or more
Heated oxygen sensor impedance
Less than 5 ohms
Duration of following condition
90 seconds or more
Heated oxygen sensor impedance
15 kohms or more
Duration of following condition
10 seconds or more
Heated oxygen sensor voltage
1.2 V or higher
2008 Toyota Tundra
2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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