SFI SYSTEM, Diagnostic DTC:P003612,P003614 and 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 |
| P102A9E | O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On |
DESCRIPTION
Refer to DTC P013613.
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 |
Heated oxygen sensor heater current reaches high limit (1 trip detection logic). |
|
Comes on |
DTC stored |
SAE Code: P0038 |
P003614 |
HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open |
Heated oxygen sensor heater current is the specified value or less while the heater is operating (1 trip detection logic). |
|
Comes on |
DTC stored |
SAE Code: P0037 |
P102A9E |
O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On |
Heated oxygen sensor heater current is higher than the specified value while the heater is not operating (1 trip detection logic). |
|
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 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 (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 in the sensor heater and stores a DTC.
MONITOR STRATEGY
Frequency of Operation |
Continuous |
TYPICAL ENABLING CONDITIONS
Time after heater on |
10 seconds or more |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on [A].
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 3000 rpm for 1 minute [C].
Idle the engine for 5 minutes or more [D].
Enter the following menus: Powertrain / Engine / Trouble Codes [E].
Read the pending DTCs.
Tip: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 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
Tip:If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
WIRING DIAGRAM
Refer to DTC P013613.
CAUTION / NOTICE / HINT
Inspect the fuses for circuits related to this system before performing the following procedure.
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.
Refer to "Data List / Active Test" [O2 Sensor Heater B1S2 and O2 Sensor Heater Current Value B1S2].
When the values for 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 Control the Injection Volume for A/F Sensor function provided in the Active Test and monitor the heated oxygen sensor output voltage (Click here). If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the 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.
Result
Proceed to
OK
NG
CHECK TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR)
*a
Front view of wire harness connector
(to Heated Oxygen Sensor)
Disconnect the heated oxygen sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Condition
Specified Condition
B154-2 (+B) - Body ground
Ignition switch ON
11 to 14 V
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN RELAY - HEATED OXYGEN SENSOR)
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
B154-1 (HT1B) - B208-17 (HT1B)
Always
Below 1 Ω
B154-1 (HT1B) or B208-17 (HT1B) - Body ground and other terminals
Always
10 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003614 OR P102A9E)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.
Powertrain > Engine > Clear DTCs
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
Powertrain > Engine > Trouble Codes
Result
Result
Proceed to
DTCs are not output
A
DTC P003612, P003614 or P102A9E is output
B