2GR-FE ENGINE CONTROL SYSTEM
– SFI SYSTEM
ES–125
ES
HINT:
•
Bank 1 refers to the bank that includes cylinder No. 1.
•
Bank 2 refers to the bank that does not include cylinder No. 1.
•
Sensor 1 refers to the sensor closest to the engine assembly.
•
Sensor 2 refers to the sensor farthest away from the engine assembly.
MONITOR DESCRIPTION
The sensing position of the Heated Oxygen (HO2) sensor has a zirconia element which is used to detect
the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature,
and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the
sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen
concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust
with heat from a heating element inside the sensor.
Heated oxygen sensor heater range check (P0037,P0038, P0057 and P0058):
The ECM monitors the current applied to the O2 sensor heater to check the heater for malfunctions. If the
current is below the threshold value, the ECM will determine that there is an open circuit in the heater. If
the current is above the threshold value, the ECM will determine that there is a short circuit in the heater.
Example:
The ECM sets DTC P0038 or P0058 when the current in the HO2 sensor heater is more than 2 A.
Conversely, when the heater current is less than 0.3 A, DTC P0037 or P0057 is set.
Heated oxygen sensor heater performance (P0141 and P0161):
After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance
using the battery voltage and the current applied to the heater. If the resistance is above the threshold
value, the ECM will determine that there is a malfunction in the HO2S heater and set DTC P0141 and
P0161.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
P0141
P0161
Cumulative heater resistance correction value exceeds
the acceptable threshold. (2 trip detection logic)
•
HO2 sensor heater
•
ECM
Related DTCs
P0037: Heated oxygen sensor heater (bank 1 sensor 2) open/short
(Low electrical current)
P0038: Heated oxygen sensor heater (bank 1 sensor 2) open/short
(High electrical current)
P0057: Heated oxygen sensor heater (bank 2 sensor 2) open/short
(Low electrical current)
P0058: Heated oxygen sensor heater (bank 2 sensor 2) open/short
(High electrical current)
P0141: Heated oxygen sensor heater performance (bank 1 sensor 2)
P0161: Heated oxygen sensor heater performance (bank 2 sensor 2)
Required sensors / components (Main)
Heated oxygen sensor heater (bank 1 sensor 2)
Heated oxygen sensor heater (bank 2 sensor 2)
Required sensors / components (Sub)
Vehicle speed sensor
Frequency of operation
Continuous
Duration
1 second: P0037, P0038, P0057 and P0058
10 seconds: P0141 and P0161
MIL operation
Immediate: P0037, P0038, P0057 and P0058
2 driving cycles: P0141 and P0161
Sequence of operation
None
Monitor runs whenever following DTCs are not present
None
DTC No.
DTC Detection Condition
Trouble Area
Содержание 2GR-FE
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Страница 630: ...ES 474 2GR FE ENGINE CONTROL SYSTEM SFI SYSTEM ES OK REPLACE ECM See page ES 518 ...
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Страница 658: ...2GR FE ENGINE CONTROL SYSTEM VVT SENSOR ES 493 ES 22 INSTALL ENGINE UNDER COVER LH ...
Страница 719: ...FU 6 2GR FE FUEL FUEL SYSTEM FU PARTS LOCATION ENGINE ROOM RELAY BLOCK ECM FUEL INJECTOR FUEL PUMP A136014E01 ...
Страница 897: ...2GR FE STARTING SMART KEY SYSTEM ST 35 ST OK REPLACE MAIN BODY ECU ...
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