DESCRIPTION
Refer to DTC P219519.
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HINT:
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
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P003012 | HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery | Air fuel ratio sensor heater current reaches the high limit (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0032 |
P003013 | HO2S Heater Control Bank 1 Sensor 1 Circuit Open | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 30% or higher (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0031 |
P005012 | HO2S Heater Control Bank 2 Sensor 1 Circuit Short to Battery | Air fuel ratio sensor heater current reaches the high limit (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0052 |
P005013 | HO2S Heater Control Bank 2 Sensor 1 Circuit Open | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 30% or higher (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P0051 |
P101A9E | A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On | Air fuel ratio 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: P101D |
P103A9E | A/F Sensor Heater Performance Bank 2 Sensor 1 Stuck On | Air fuel ratio 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: P103D |
MONITOR DESCRIPTION
The ECM uses information from the air fuel ratio sensor to regulate the air fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gases.
The air fuel ratio sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum-coated zirconia and includes an integrated heating element.
The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.
The air fuel ratio sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful voltage signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor becomes inaccurate. As a result, the ECM is unable to regulate the air fuel ratio properly.
When the current in the air fuel ratio 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
Related DTCs | P0031: Air fuel ratio sensor (bank 1 sensor 1) heater range check (low current) P0032: Air fuel ratio sensor (bank 1 sensor 1) heater range check (high current) P0051: Air fuel ratio sensor (bank 2 sensor 1) heater range check (low current) P0052: Air fuel ratio sensor (bank 2 sensor 1) heater range check (high current) P101D: Air fuel ratio sensor (bank 1 sensor 1) heater performance P103D: Air fuel ratio sensor (bank 2 sensor 1) heater performance |
Required Sensors/Components (Main) | Air fuel ratio sensor heater |
Required Sensors/Components (Related) | - |
Frequency of Operation | Continuous |
Duration | 10 seconds: P0031 and P0051 10.24 seconds: P0032 and P0052 1 second: P101D and P103D |
MIL Operation | Immediate |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
P0031 and P0051 All of the following conditions are met | - |
Battery voltage | 10.5 V or higher |
Time after heater on | 5 seconds or more |
Active heater off control | Not operating |
Active heater on control | Not operating |
Air fuel ratio sensor heater performance fail (P101D, P103D) | Not detected |
Heater output duty cycle | 30% or higher |
Monitor runs whenever the following DTCs are not stored | None |
All of the following conditions are met | - |
Battery voltage | 10.5 V or higher |
Time after heater on | 5 seconds or more |
Heater output duty cycle | Higher than 0% |
Active heater off control | Not operating |
Active heater on control | Not operating |
All of the following conditions are met | - |
Battery voltage | 10.5 V or higher |
Air fuel ratio sensor heater low current fail (P0031, P0051) | Not detected |
Heater output duty cycle | Less than 60% |
Active heater off control | Not operating |
Active heater on control | Not operating |
TYPICAL MALFUNCTION THRESHOLDS
P0031 and P0051 Heater on current | Less than 0.8 A |
Both of the following conditions are met | - |
Command to heater output | On |
Heater current detected by heater monitor IC | 14 A or higher |
Both of the following conditions are met | - |
Heater current detected by heater monitor IC | 14 A or higher |
Heater off current | Higher than 11 A |
CONFIRMATION DRIVING PATTERN
HINT:
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HINT:
Techstream Display | Description |
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NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
Refer to DTC P219519.
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CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
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*: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
PROCEDURE
1. | INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) |
(a) Inspect the air fuel ratio sensor.
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HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor.
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NG | REPLACE AIR FUEL RATIO SENSOR |
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2. | CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR) |
*a | Front view of wire harness connector (to Air Fuel Ratio Sensor) | *b | Bank 1 |
*c | Bank 2 | - | - |
(a) Disconnect the air fuel ratio sensor connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
C26-2 (+B) - Body ground | Engine switch on (IG) | 11 to 14 V |
C27-2 (+B) - Body ground | Engine switch on (IG) | 11 to 14 V |
NG | GO TO STEP 6 |
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3. | CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) |
(a) Disconnect the air fuel ratio sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
C26-1 (HA1A) - C32-52 (HA1A) | Always | Below 1 Ω |
C27-1 (HA2A) - C32-17 (HA2A) | Always | Below 1 Ω |
C26-1 (HA1A) or C32-52 (HA1A) - Body ground and other terminals | Always | 10 kΩ or higher |
C27-1 (HA2A) or C32-17 (HA2A) - Body ground and other terminals | Always | 10 kΩ or higher |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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4. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTC.
Powertrain > Engine > Clear DTCs(e) Turn the engine switch off and wait for at least 30 seconds.
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5. | CHECK WHETHER DTC OUTPUT RECURS (DTC P003012, P003013, P005012, P005013, P101A9E OR P103A9E) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Enter the following menus: Powertrain / Engine / Trouble Codes.
(c) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
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DTCs are not output | A |
DTC P003012, P003013, P005012, P005013, P101A9E or P103A9E is output | B |
A | CHECK FOR INTERMITTENT PROBLEMS |
B | REPLACE ECM |
6. | INSPECT A/F HTR RELAY |
(a) Inspect the A/F HTR relay.
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NG | REPLACE A/F HTR RELAY |
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7. | CHECK TERMINAL VOLTAGE (POWER SOURCE OF A/F HTR RELAY) |
*1 | No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly |
*2 | A/F HTR Relay |
(a) Remove the A/F HTR relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
3 (A/F HTR relay) - Body ground | Always | 11 to 14 V |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - A/F HTR RELAY) |
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8. | CHECK HARNESS AND CONNECTOR (A/F HTR RELAY - BODY GROUND) |
(a) Remove the A/F HTR relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
1 (A/F HTR relay) - Body ground | Always | Below 1 Ω |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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9. | CHECK HARNESS AND CONNECTOR (A/F HTR RELAY - AIR FUEL RATIO SENSOR) |
(a) Remove the A/F HTR relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the air fuel ratio sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
5 (A/F HTR relay) - C26-2 (+B) | Always | Below 1 Ω |
5 (A/F HTR relay) - C27-2 (+B) | Always | Below 1 Ω |
5 (A/F HTR relay) or C26-2 (+B) - Body ground and other terminals | Always | 10 kΩ or higher |
5 (A/F HTR relay) or C27-2 (+B) - Body ground and other terminals | Always | 10 kΩ or higher |
OK | REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - A/F HTR RELAY) |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |