RM36D0EC _51 Engine / Hybrid System _083058 M20D-FKS ENGINE CONTROL _0401834 SFI SYSTEM C

M20D-FKS ENGINE CONTROL  SFI SYSTEM  P003612  HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery  P003613  A/F (O2) Heater Control Circuit Bank 1 Sensor 2 Circuit Open  P102A9E  O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On  


DESCRIPTION

The air fuel ratio sensor (sensor 2) generates current that corresponds to the actual air fuel ratio. This sensor current is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection duration. If the air fuel ratio sensor (sensor 2) malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor (sensor 2) is a cup type sensor and uses a zirconia element for the sensor element. The zirconium element is made of platinum coated zirconium and includes an integrated heating element. The inner surface of the zirconia element is exposed to the outside air and the outer surface of it is exposed to the exhaust gas. The zirconia element generates a voltage according to the oxygen concentration of the exhaust gas and outside air. The air fuel ratio sensor (sensor 2) becomes very efficient when heated. When the exhaust gas temperature is low, the sensor does not generate useful voltage signals without supplementary heating. Therefore, the air fuel ratio sensor (sensor 2) includes a heater to heat the zirconia element.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel ratio.

A392733E04
0.604,2.458 0.917,2.313 false 3.052,0.583 3.156,0.354 false 2.74,0.792 3.521,0.708 true 2.854,0.823 3.531,0.719 true 2.792,0.896 3.188,1.26 true 2.625,1.625 3.219,2.031 true 2.75,2.063 3.156,2.406 true 0.208,2.458 0.667,2.656 0.458,0.198 10 false Cover 0.063,0.052 2.208,0.281 2.146,0.229 10 false Air Fuel Ratio Sensor (Sensor 2) 2.323,0.031 3.135,0.219 0.813,0.188 10 false Atmosphere 1.5,2.073 2.031,2.479 0.531,0.406 10 false Exhaust Gas 3.229,0.26 3.906,0.5 0.677,0.24 10 false Housing 3.594,0.646 4.771,0.969 1.177,0.323 10 false Platinum Electrode 3.292,1.219 4.417,1.625 1.125,0.406 10 false Solid Electrolyte (Zirconia Element) 3.313,2.01 3.875,2.229 0.563,0.219 10 false Heater 3.219,2.354 4.594,2.583 1.375,0.229 10 false Coating (Ceramic) 3.844,0.073 5.24,0.333 1.396,0.26 10 false Output Current (mA) 5.719,2.448 6.75,2.667 1.031,0.219 10 false Air Fuel Ratio 5.292,2.229 5.479,2.448 0.188,0.219 10 false 12 5.563,2.229 5.75,2.448 0.188,0.219 10 false 13 5.813,2.229 6,2.448 0.188,0.219 10 false 14 6.052,2.229 6.24,2.448 0.188,0.219 10 false 15 6.302,2.229 6.49,2.448 0.188,0.219 10 false 16 6.563,2.229 6.76,2.448 0.198,0.219 10 false 17 6.802,2.229 6.99,2.448 0.188,0.219 10 false 18 4.917,1.125 5.104,1.344 0.188,0.219 10 false 0 4.906,0.396 5.271,0.615 0.365,0.219 10 false 4 4.906,0.76 5.25,0.969 0.344,0.208 10 false 2 4.865,1.5 5.271,1.76 0.406,0.26 10 false -2 4.865,1.865 5.281,2.125 0.417,0.26 10 false -4

HINT:
·

When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor (sensor 2) heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.

·

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor (sensor 2).

·

The ECM has a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor (sensor 2) heater circuit uses a relay on the +B side of the circuit.

A545088E03
0.125,0.115 3.573,0.458 3.448,0.344 10 false Reference (System Diagram of Sensor 2): 0.271,0.99 1.208,1.323 0.938,0.333 10 false from Battery 0.104,1.906 1.094,2.604 0.99,0.698 10 false from EFI-MAIN NO. 1 Relay 1.146,1.156 1.792,1.875 0.646,0.719 10 false EFI-MAIN NO. 2 1.656,2.219 2.75,2.875 1.094,0.656 10 false EFI-MAIN NO. 2 2.615,1.156 3.385,1.594 0.771,0.438 10 false EFI NO. 3 3.438,1.906 4.781,2.417 1.344,0.51 10 false Air Fuel Ratio Sensor (Sensor 2) 3.854,0.677 4.625,1.115 0.771,0.438 10 false Heater 3.833,1.188 4.802,1.698 0.969,0.51 10 false Sensor 3.427,0.875 4.198,1.313 0.771,0.438 10 false +B 3.323,1.406 4.094,1.844 0.771,0.438 10 false A1B- 4.5,1.417 5.271,1.854 0.771,0.438 10 false A1B+ 5.052,1.417 5.823,1.854 0.771,0.438 10 false A1B+ 5.063,2.438 5.833,2.875 0.771,0.438 10 false A1B- 4.5,0.885 5.271,1.323 0.771,0.438 10 false HA1B 5.063,0.885 5.833,1.323 0.771,0.438 10 false HA1B 5.823,3.177 6.594,3.615 0.771,0.438 10 false ECM 6.177,1.521 6.979,2.021 0.802,0.5 10 false Duty Control



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 air fuel ratio sensor (sensor 2) heater current is more than the specified value while the heater is operating (1 trip detection logic).
·

Short in air fuel ratio sensor (sensor 2) heater circuit

·

Air fuel ratio sensor (sensor 2)

·

ECM


Comes on DTC stored SAE: P0038
P003613 A/F (O2) Heater Control Circuit Bank 1 Sensor 2 Circuit Open The air fuel ratio sensor (sensor 2) heater current is less than the specified value while the heater is operating (1 trip detection logic).
·

Open or short in air fuel ratio sensor (sensor 2) heater circuit

·

Air fuel ratio sensor (sensor 2)

·

EFI-MAIN NO. 2 relay

·

ECM


Comes on DTC stored SAE: P0037
P102A9E O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On The air fuel ratio sensor (sensor 2) heater voltage is the specified value or less while the heater is not operating (1 trip detection logic).
·

Short in air fuel ratio sensor (sensor 2) heater circuit

·

Air fuel ratio sensor (sensor 2)

·

ECM


Comes on DTC stored SAE: P102D

MONITOR DESCRIPTION

The air fuel ratio sensor (sensor 2) 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 (sensor 2) is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful current 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 (sensor 2) becomes inaccurate. As a result, the ECM is unable to regulate the air fuel ratio properly.

Air Fuel Ratio Sensor (Sensor 2) Heater Range Check (P003612 and P003613):

The ECM monitors the current applied to the air fuel ratio sensor (sensor 2) heater to check the heater for malfunctions.

If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor (sensor 2) becomes inaccurate. When the current in the air fuel ratio sensor (sensor 2) heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.



Air Fuel Ratio Sensor (Sensor 2) Heater Performance (P102A9E):

When the air fuel ratio sensor (sensor 2) heater terminal voltage is the specified value or less while the heater is not operating, the ECM determines that there is a malfunction in the sensor heater and stores DTC.



MONITOR STRATEGY

Frequency of Operation Continuous

TYPICAL ENABLING CONDITIONS

Time after heater on 5 seconds or more

CONFIRMATION DRIVING PATTERN

HINT:
·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



A262623E65
0.792,0.969 1.583,1.26 0.792,0.292 10 false 3000 rpm 1.031,1.74 1.552,1.99 0.521,0.25 10 false Idling 0.229,2.021 1.635,2.396 1.406,0.375 10 false Ignition Switch ON 1.927,2.135 2.24,2.375 0.313,0.24 10 false [A] 2.76,1.625 3.146,1.938 0.385,0.313 10 false [B] 4.021,0.865 4.323,1.146 0.302,0.281 10 false [C] 5.385,1.604 5.594,2.135 0.208,0.531 10 false [D] 2.271,2.594 3.469,2.75 1.198,0.156 10 false 5 minutes or more 4.875,2.604 6.073,2.76 1.198,0.156 10 false 5 minutes or more 3.854,2.615 4.458,2.854 0.604,0.24 10 false 1 minute 5.979,3.031 6.177,3.229 0.198,0.198 10 false [E]

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

5.

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

6.

Turn the ignition switch to ON [A].

7.

Turn the GTS on.

8.

Start the engine and idle it for 5 minutes or more [B].

9.

With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].

10.

Idle the engine for 5 minutes or more [D].

11.

Enter the following menus: Powertrain / Engine / Trouble Codes [E].

12.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



13.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

14.

Input the DTC: P003612, P003613 or P102A9E.

15.

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



HINT:
·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

If the judgment result is INCOMPLETE, perform steps [B] through [E] again.

·

[A] to [E]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




WIRING DIAGRAM

A534793E03
5.74,0.458 6.344,0.646 0.604,0.188 10 false HA1B 5.75,1.229 6.354,1.417 0.604,0.188 10 false A1B+ 5.76,2.188 6.365,2.375 0.604,0.188 10 false A1B- 5.75,3.271 6.354,3.458 0.604,0.188 10 false MREL 6.5,3.375 6.865,3.573 0.365,0.198 10 false IC 6.49,1.802 6.854,2 0.365,0.198 10 false IC 5.365,0.573 5.813,0.729 0.448,0.156 10 false C71 5.375,1.344 5.823,1.5 0.448,0.156 10 false C71 5.385,2.302 5.833,2.458 0.448,0.156 10 false C71 5.344,3.375 5.792,3.531 0.448,0.156 10 false A116 5.458,0.385 5.906,0.542 0.448,0.156 10 false 9 5.375,1.167 5.823,1.323 0.448,0.156 10 false 139 5.385,2.115 5.833,2.271 0.448,0.156 10 false 138 5.073,2.594 5.521,2.75 0.448,0.156 10 false * 5.417,3.198 5.865,3.354 0.448,0.156 10 false 26 3.385,1.531 3.99,1.719 0.604,0.188 10 false C29 3.406,1.708 4.729,2.135 1.323,0.427 10 false Air Fuel Ratio Sensor (Sensor 2) 4.125,0.448 4.729,0.635 0.604,0.188 10 false HA1B 3.729,0.448 4.333,0.635 0.604,0.188 10 false +B 4.135,1.219 4.74,1.406 0.604,0.188 10 false A1B+ 3.729,1.219 4.333,1.406 0.604,0.188 10 false A1B- 4.594,0.458 5.042,0.615 0.448,0.156 10 false 1 4.594,1.24 5.042,1.396 0.448,0.156 10 false 3 3.563,0.448 4.01,0.604 0.448,0.156 10 false 2 3.552,1.24 4,1.396 0.448,0.156 10 false 4 2.698,0.708 3.49,0.896 0.792,0.188 10 false EFI NO. 3 1.49,1.167 2.552,1.365 1.063,0.198 10 false EFI-MAIN NO. 2 2.375,0.458 2.823,0.615 0.448,0.156 10 false 5 1.573,0.458 2.021,0.615 0.448,0.156 10 false 3 1.573,0.75 2.021,0.906 0.448,0.156 10 false 2 2.375,0.74 2.823,0.896 0.448,0.156 10 false 1 0.49,0.708 1.563,0.917 1.073,0.208 10 false EFI-MAIN NO. 2 0.635,3.24 1.25,3.635 0.615,0.396 10 false EFI-MAIN NO. 1 1.531,3.688 2.563,4 1.031,0.313 10 false EFI-MAIN NO. 1 1.583,3.281 2.031,3.438 0.448,0.156 10 false 1 2.385,3.281 2.833,3.438 0.448,0.156 10 false 2 2.385,2.99 2.833,3.146 0.448,0.156 10 false 5 1.583,3 2.031,3.156 0.448,0.156 10 false 3 0.667,5.75 1.281,6.146 0.615,0.396 10 false Battery 4.313,6.438 5.125,6.677 0.813,0.24 10 false *: Shielded 6.156,4.833 6.615,5.125 0.458,0.292 10 false ECM

CAUTION / NOTICE / HINT

NOTICE:

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


HINT:
·

Refer to "Data List / Active Test" [A/F Sensor Heater Duty B1S2].

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DATA LIST / ACTIVE TEST

·

Sensor 1 refers to the sensor closest to the engine assembly.

·

Sensor 2 refers to the sensor farthest away from the engine assembly.

·

Change the fuel injection volume using the Control the Injection Volume for A/F Sensor function provided in the Active Test and monitor the air fuel ratio sensor (sensor 2) output current (Click here Engine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>P013616). If the sensor output current 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

1.INSPECT AIR FUEL RATIO SENSOR (SENSOR 2) (HEATER RESISTANCE)
a.

Inspect the air fuel ratio sensor (sensor 2).

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>AIR FUEL RATIO SENSOR>INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR (SENSOR 2))

NG

REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>AIR FUEL RATIO SENSOR>REMOVAL


2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR (SENSOR 2))
A376499C63
0.396,0.875 0.802,1.167 0.406,0.292 1.917,1.063 2.177,1.698 true 0.156,0.167 0.469,0.323 0.313,0.156 10 false *a 2.104,1.719 2.417,1.875 0.313,0.156 10 false +B 0.479,0.948 0.792,1.104 0.313,0.156 10 false C29
*a Front view of wire harness connector
(to Air Fuel Ratio Sensor (Sensor 2))


a.

Disconnect the air fuel ratio sensor (sensor 2) connector.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
C29-2 (+B) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 2) - ECM)

NG

6.INSPECT EFI-MAIN NO. 2 RELAY
3.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 2) - ECM)
a.

Disconnect the air fuel ratio sensor (sensor 2) 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
C29-1 (HA1B) - C71-9 (HA1B) Always Below 1 Ω
C29-1 (HA1B) or C71-9 (HA1B) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CLEAR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

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


Result:
Proceed to
NEXT



NEXT

5.CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003613 AND/OR P102A9E)
5.CHECK WHETHER DTC OUTPUT RECURS (DTC P003612, P003613 AND/OR P102A9E)
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
50001 372
Result:
Result Proceed to
DTCs are not output A
DTC P003612, P003613 and/or P102A9E is output B




A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE ECM

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


6.INSPECT EFI-MAIN NO. 2 RELAY
a.

Inspect the EFI-MAIN NO. 2 relay.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

7.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

NG

REPLACE EFI-MAIN NO. 2 RELAY

7.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)
A562508C01
0.094,0.052 0.406,0.208 0.313,0.156 10 false *1 2.125,0.406 2.438,0.563 0.313,0.156 10 false *2
*1 No. 1 Engine Room Relay Block and Junction Block Assembly
*2 EFI-MAIN NO. 2 Relay


a.

Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and junction block assembly.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
3 (EFI-MAIN NO. 2 relay) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 2 RELAY)

8.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)
a.

Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and junction block assembly.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1 (EFI-MAIN NO. 2 relay) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - AIR FUEL RATIO SENSOR (SENSOR 2))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - AIR FUEL RATIO SENSOR (SENSOR 2))
a.

Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and junction block assembly.


b.

Disconnect the air fuel ratio sensor (sensor 2) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
5 (EFI-MAIN NO. 2 relay) - C29-2 (+B) Always Below 1 Ω
5 (EFI-MAIN NO. 2 relay) or C29-2 (+B) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR