DTC P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)
DTC P0038 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)
DTC P0057 Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2)
DTC P0058 Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2)
DTC P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
DTC P0161 Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
HINT: Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located furthest from the engine assembly.
DESCRIPTION
Refer to DTC P0136.
HINT: When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the Heated Oxygen (HO2) sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
DTC No. |
DTC Detection Condition |
Trouble Area |
P0037 P0057 |
Heated Oxygen (HO2) sensor heater current is less than 0.3 A (1 trip detection logic) |
|
P0038 P0058 |
Heated Oxygen (HO2) sensor heater current is more than 2 A (1 trip detection logic) |
|
P0141 P0161 |
Cumulative heater resistance correction value exceeds the acceptable threshold (2 trip detection logic) |
|
HINT:
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:
P0037 and P0057:
P0038 and P0058 Case 1:
P0038 and P0058 Case 2:
P0141 and P0161:
TYPICAL MALFUNCTION THRESHOLDS
P0037 and P0057:
P0038 and P0058:
P0141 and P0161 (Heater performance monitor check):
COMPONENT OPERATING RANGE
MONITOR RESULT
Refer to CHECKING MONITOR STATUS.
WIRING DIAGRAM
Refer to DTC P0136.
INSPECTION PROCEDURE
HINT:
1 INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
Standard resistance: Bank 1
Bank 2
2 CHECK TERMINAL VOLTAGE (+B OF SENSOR)
Standard voltage
3 INSPECT FUSE (EFI NO. 2 FUSE)
Standard resistance: Below 1 Ω
4 INSPECT RELAY (EFI RELAY)
Standard resistance
REPAIR OR REPLACE HARNESS OR CONNECTOR (HO2 SENSOR - EFI RELAY)
5 CHECK HARNESS AND CONNECTOR (HO2 SENSOR - ECM)
Standard resistance: Check for open
Check for short
6 CHECK WHETHER DTC OUTPUT RECURS
Result
CHECK FOR INTERMITTENT PROBLEMS
Emergency flashers
The emergency flashers are used to warn other drivers when the
vehicle has to be stopped in the road due to a breakdown, etc.
Press the switch.
All the turn signal lights will flash.
To turn them off, press the switch
once again.
Emergency flashers
If the emergency flashers are used f ...
Pressure Control Solenoid "A" Performance (Shift Solenoid
Valve SL1)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to
detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory
to detect mechanical
problems of the shift solenoid valves, valve b ...
Installation
1. INSTALL TRANSAXLE HOUSING OIL SEAL
(a) Using SST and a hammer, install a new oil seal.
SST 09316-60011 (09316-00011)
Oil seal installation depth:
-0.5 to 0.5 mm (-0.020 to 0.020 in.)
(b) Coat the lip of the oil seal with MP grease.
2. INSTALL DIFFERENTIAL SIDE BEARING RETAINER OIL SEA ...