Toyota 2GR-FE Manual page 510

ES–354
Element
ES
A
Exhaust Gas
DTC No.
P2195
P2197
P2195
P2197
P2196
P2198
P2196
P2198
HINT:
• DTCs P2195 and P2196 indicate malfunctions related to the bank 1 A/F sensor circuit.
• DTCs P2197 and P2198 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.
• When any of these DTCs are set, check the A/F sensor output voltage by entering the following menus
on the intelligent tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / AFS B1S1.
• Short-term fuel trim values can also be read using an intelligent tester.
• The ECM regulates the voltages at the A1A+, A2A+, A1A- and A2A- terminals of the ECM to a
constant level. Therefore, the A/F sensor output voltage cannot be confirmed without using the
intelligent tester.
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Cover
A
A-A Section
DTC Detection Condition
Conditions (a) and (b) continue for 2 seconds or more
(2 trip detection logic):
(a) Air-Fuel Ratio (A/F) sensor voltage is more than 3.8
V
(b) Heated Oxygen (HO2) sensor voltage is 0.15 V or
more
While fuel-cut operation is performed (during vehicle
deceleration), air-fuel ratio (A/F) sensor current is 3.6
mA or more for 3 seconds (2 trip detection logic)
Conditions (a) and (b) continue for 2 seconds or more
(2 trip detection logic):
(a) A/F sensor voltage is less than 2.8 V
(b) HO2 sensor voltage is less than 0.85 V
While fuel-cut operation is performed (during vehicle
deceleration), air-fuel ratio (A/F) sensor current is 1.4
mA for 3 seconds (2 trip detection logic)
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 (bank 1, 2 sensor 1) heater
• A/F sensor heater relay
• A/F sensor heater and relay circuits
• Air induction system
• Injector
• ECM
• A/F sensor
• 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 (bank 1, 2 sensor 1) heater
• A/F sensor heater relay
• A/F sensor heater and relay circuits
• Air induction system
• Injector
• ECM
• A/F sensor
• ECM
Ideal Air-Fuel Mixture
Rich - Air Fuel Ratio - Lean
A107164E14
Trouble Area