ES–116
2GR-FE ENGINE CONTROL SYSTEM
– SFI SYSTEM
ES
HINT:
•
When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the A/F sensor
heater in fail-safe mode. Fail-safe mode continues until the engine switch is turned off.
•
The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The
A/F sensor heater circuit uses a relay on the B+ side of the circuit.
DTC No.
DTC Detection Condition
Trouble Area
P0031
P0051
Air-Fuel Ratio (A/F) sensor heater (bank 1, 2, sensor 1)
current is less than 0.8 A (1 trip detection logic)
•
Open in A/F sensor heater (bank 1, 2, sensor 1)
circuit
•
A/F sensor heater (bank 1, 2, sensor 1)
•
A/F HTR relay
•
ECM
A
A
Element
Exhaust Gas
A-A Section
Platinum electrode
Cover
Air
Heater
Solid electrolyte
(Zirconia Element)
Rich - Air Fuel Ratio - Lean
Ideal Air-Fuel Mixture
Output Voltage
A107164E13
Reference (System Diagram of Bank 1 Sensor 1):
ECM
A/F Sensor
A/F Relay
From
Battery
From
EFI
Relay
A/F
HA1A
Duty
Control
A1A+
HA1A
+B
A1A+
Heater
Sensor
A1A-
A1A-
A133850E04
Summary of Contents for 2GR-FE
Page 176: ...ES 20 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES NEXT 20 CONDUCT CONFIRMATION TEST END ...
Page 247: ...2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES 91 ES OK REPLACE ECM See page ES 518 ...
Page 412: ...ES 256 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES A END ...
Page 447: ...2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES 291 ES OK REPLACE ECM See page ES 518 ...
Page 556: ...ES 400 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES A REPLACE TCM ...
Page 630: ...ES 474 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES OK REPLACE ECM See page ES 518 ...
Page 658: ...2GR FE ENGINE CONTROL SYSTEM VVT SENSOR ES 493 ES 22 INSTALL ENGINE UNDER COVER LH ...
Page 897: ...2GR FE STARTING SMART KEY SYSTEM ST 35 ST OK REPLACE MAIN BODY ECU ...
Page 923: ...2GR FE STARTING SMART KEY SYSTEM ST 61 ST OK REPLACE MAIN BODY ECU ...
Page 935: ...2GR FE STARTING SMART KEY SYSTEM ST 73 ST OK REPLACE MAIN BODY ECU ...
Page 940: ...ST 78 2GR FE STARTING SMART KEY SYSTEM ST OK REPLACE MAIN BODY ECU ...
Page 958: ...ST 96 2GR FE STARTING SMART KEY SYSTEM ST OK END MAIN BODY ECU DEFECTIVE ...