Toyota 2GR-FE Manual page 232

ES–76
DTC No.
P0158
P0161
P0171
ES
P0172
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Detection Item Suspected Trouble
Area
Oxygen Sensor 1. Short in HO2
Circuit High Voltage sensor (bank 2
(Bank 2 Sensor 2) sensor 2) circuit
2. HO2 sensor (bank
2 sensor 2)
3. ECM internal
circuit malfunction
Oxygen Sensor 1. HO2 sensor
Heater Circuit 2. ECM
Malfunction (Bank 2
Sensor 2)
System Too Lean 1. Air induction
(Bank 1) system
2. Injector blockage
3. MAF meter
4. ECT sensor
5. Fuel pressure
6. Gas leakage from
exhaust system
7. Open or short in A/
F sensor (bank 1
sensor 1) circuit
8. A/F sensor (bank 1
sensor 1)
9. A/F sensor heater
(bank 1 sensor 1)
10. A/F sensor heater
relay
11. A/F sensor heater
and A/F sensor
heater relay circuits
12. PCV hose
connections
13. PCV valve and
hose
14. ECM
System Too Rich 1. Injector leakage or
(Bank 1) blockage
2. MAF meter
3. ECT sensor
4. Ignition system
5. Fuel pressure
6. Gas leakage from
exhaust system
7. Open or short in A/
F sensor (bank 1
sensor 1) circuit
8. A/F sensor (bank 1
sensor 1)
9. A/F sensor heater
(bank 1 sensor 1)
10. A/F sensor heater
relay
11. A/F sensor heater
and A/F sensor
heater relay circuits
12. ECM
MIL Memory
Comes on DTC stored
Comes on DTC stored
Comes on DTC stored
Comes on DTC stored
See page
ES-171
ES-115
ES-191
ES-191