Toyota 2GR-FE Manual page 529

Element
A
Exhaust Gas
DTC No.
•
Condition (a) or (b) continues for 5.0 seconds or more
(1 trip detection logic):
P2238 (a) AF+ voltage is 0.5 V or less
P2241 (b) (AF+) - (AF-) = 0.1 V or less
•
A/F sensor admittance: Less than 0.022 1/Ω
(2 trip detection logic)
P2239 AF+ voltage is more than 4.5 V for 5.0 seconds or more
P2242 (2 trip detection logic)
P2252 AF- voltage is 0.5 V or less for 5.0 seconds or more
P2255 (2 trip detection logic)
P2253 AF- voltage is more than 4.5 V for 5.0 seconds or more
P2256 (2 trip detection logic)
HINT:
• DTCs P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 A/F sensor circuit.
• DTCs P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 A/F sensor circuit.
• Bank 1 refers to the bank that includes cylinder No. 1.
• Bank 2 refers to the bank that includes cylinder No. 2.
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Cover
A
A-A Section
DTC Detection Condition
Case 1:
Case 2:
Output Voltage
Heater
Solid electrolyte
(Zirconia Element)
Platinum electrode
Air
• Open or short in A/F sensor (bank 1, 2 sensor 1)
circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater
• A/F sensor heater relay
• A/F sensor heater and relay circuits
• ECM
• Open or short in A/F sensor (bank 1, 2 sensor 1)
circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater
• A/F sensor heater relay
• A/F sensor heater and relay circuits
• ECM
• Open or short in A/F sensor (bank 1, 2 sensor 1)
circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater
• A/F sensor heater relay
• A/F sensor heater and relay circuits
• ECM
• Open or short in A/F sensor (bank 1, 2 sensor 1)
circuit
• A/F sensor (bank 1, 2 sensor 1)
• A/F sensor heater
• A/F sensor heater relay
• A/F sensor heater and relay circuits
• ECM
ES–373
Ideal Air-Fuel Mixture
Rich - Air Fuel Ratio - Lean
A107164E14
Trouble Area
ES