P003612, P003614, P014118, P102A9E

DTC Code	DTC Name
P003612	HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery
P003614	HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open
P014118	O2 Sensor Heater Circuit Bank 1 Sensor 2 Circuit Current Below Threshold
P102A9E	O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On

DESCRIPTION

Refer to DTC P013611.

Tech Tips

When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the power switch is turned off.
The heated oxygen sensor heater circuit uses a relay on the +B side of the circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P003612	HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery	The heated oxygen sensor heater current is the specified value or higher while the heater is operating (1 trip detection logic).	Short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	DTC stored	SAE Code: P0038
P003614	HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open	The heated oxygen sensor heater current is the specified value or less while the heater is operating (1 trip detection logic).	Open or short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	DTC stored	SAE Code: P0037
P014118	O2 Sensor Heater Circuit Bank 1 Sensor 2 Circuit Current Below Threshold	The heated oxygen sensor impedance value exceeds the threshold (2 trip detection logic).	Open or short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	DTC stored	SAE Code: P0141
P102A9E	O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On	The heated oxygen sensor heater current is higher than the specified value while the heater is not operating (1 trip detection logic).	Short in heated oxygen sensor (sensor 2) heater circuit Heated oxygen sensor (sensor 2) ECM	Comes on	DTC stored	SAE Code: P102D

MONITOR DESCRIPTION

The sensing portion of the heated oxygen 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. 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 and Heater Performance (Stuck ON) (P003612, P003614 and P102A9E):
- The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions.
  
  If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction of the sensor heater and stores a DTC.

Heated Oxygen Sensor Heater Performance (Heater Impedance) (P014118):
- After the accumulated heater on time exceeds 100 or 250 seconds, the ECM calculates the heater resistance using auxiliary battery voltage and the current applied to the heater. If the resistance is above the threshold value, the ECM determines that there is a malfunction in the heated oxygen sensor heater and stores DTC P014118.

MONITOR STRATEGY

Required Sensors/Components

Heated oxygen sensor (sensor 2) heater

Frequency of Operation

Continuous: P0037, P0038, P102D

Once per driving cycle: P0141

TYPICAL ENABLING CONDITIONS

P003612
Time after heater on	10 seconds or more

P003614
Time after heater on	10 seconds or more

P014118
Accumulated heater on time	100 seconds or more

P102A9E
Time after heater on	10 seconds or more

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) [A].
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).

Click here
Start the engine and idle it for 5 minutes or more [B].
With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 rpm for 1 minute [C].

Tech Tips

During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, perform steps [C] and [D] after charge control has completed.
Idle the engine for 5 minutes or more [D].
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P003612, P003614, P014118 or P102A9E.

Check the DTC judgment result.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
If the judgment result is INCOMPLETE or N/A, perform steps [B] through [E] again.

WIRING DIAGRAM

Refer to DTC P013611.

Click here

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

The operation of the heated oxygen sensor heater can be checked by referring to the Data List items "O2 Sensor Heater B1S2" and "O2 Sensor Heater Current Value B1S2".

Click here
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
When the value of the Data List item O2 Sensor Heater Current Value B1S2 is not 0 A, the heater is on.
Change the fuel injection volume using the Active Test "Control the Injection Volume for A/F Sensor" and monitor the heated oxygen sensor output voltage Click here. If the heated oxygen sensor output voltage does not change (almost no reaction) while performing the Active Test, the heated oxygen sensor may be malfunctioning.
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

Inspect the heated oxygen sensor.

Click here

Result

Proceed to
OK
NG

NG

REPLACE HEATED OXYGEN SENSOR Click here Perform "Inspection After Repair" after replacing the heated oxygen sensor. Click here

OK

CHECK TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)

Disconnect the heated oxygen sensor connector.
Turn the power switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
C9-2 (+B) - Body ground	Power switch on (IG)	11 to 14 V

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - HEATED OXYGEN SENSOR)

OK

CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

Disconnect the heated oxygen sensor connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
C9-1 (HT1B) - C31-56 (HT1B)	Always	Below 1 Ω
C9-1 (HT1B) or C31-56 (HT1B) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CLEAR DTC

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the power switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003614, P014118 OR P102A9E)

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the pending DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
P003612, P003614, P014118 or P102A9E is output	B

A

CHECK FOR INTERMITTENT PROBLEMS Click here

B

REPLACE ECM Click here

SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P003612, P003614, P014118, P102A9E