Part 2
PROCEDURE1. READ DTC OUTPUT
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Select the following menu items: Powertrain / Engine / Trouble Codes.
(e) Read DTCs.
Result:
D -- READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
C -- READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
B -- CHECK FOR EXHAUST GAS LEAK
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Select the following menu items: Select: Powertrain / Engine / Data List / A/F Control System / O2S B1S2 or O2S B2S2.
(e) Allow the engine to idle.
(f) Read the heated oxygen sensor output voltage while idling.
Result:
B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)
A -- Continue to next step.
3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)
(a) Disconnect the J68*1 or J40*2, Q4*3 HO2 sensor connector.
HINT
- *1: Bank 1 Sensor 2
- *2: Bank 2 Sensor 2 (2WD)
- *3: Bank 2 Sensor 2 (4WD)
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Bank 1 sensor 2):
Standard resistance (Bank 2 sensor 2):
NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
(a) Turn the engine switch off and wait for 5 minutes.
(b) Disconnect the A6 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(d) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal
5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Start the engine and warm it up.
(e) Select the following menu items: Powertrain / Engine / Active Test / Control the Injection Volume.
(f) Change the fuel injection volume using the tester, and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the tester.
HINT
- Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range.
- The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as O2S B1S2 or O2S B2S2 on the Techstream.
Result:
HINT
A normal heated oxygen sensor voltage (O2S B1S2 or O2S B1S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- Continue to next step.
6. INSPECT AIR FUEL RATIO SENSOR
HINT
This air fuel ratio sensor test is to check the air fuel ratio sensor current during the fuel-cut. When the sensor is normal, the sensor current will indicate below 3.0 mA in this test.
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Drive the vehicle according to the drive pattern listed below:
(1) Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more.
(2) Drive the vehicle at 37 mph (60 km/h) or more and decelerate the vehicle for 5 seconds or more.
(3) Repeat the deceleration above at least 3 times.
(e) Select the following menu items: Select: Powertrain / Engine / Monitor / O2 Sensor / Details.
(f) Confirm that RANGE B1S1 and RANGE B2S1 are either Pass or Fail. If the tester shows Incomplete, re-check RANGE B1S1 and RANGE B2S1 after performing the drive pattern.
(g) Select the RANGE B1S1 and RANGE B2S1.
(h) Read the Test Value.
Standard current:
Less than 3.0 mA
HINT
If the tester shows Incomplete again, add the vehicle speed and use the second gear to decelerate the vehicle. Refer to the CONFIRMATION DRIVING PATTERN.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- REPLACE HEATED OXYGEN SENSOR
7. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Start the engine.
(e) Select the following menu items: Powertrain / Engine / Data List / A/F Control System / O2S B1S2 or O2S B2S2.
(f) After warming up the engine, run the engine at an engine speed of 2500 rpm for 3 minutes.
(g) Read the output voltage of the heated oxygen sensor when the engine rpm is suddenly increased.
HINT
Quickly accelerate the engine to 4000 rpm 3 times using the accelerator pedal.
Standard:
Fluctuates between 0.4 V or less and 0.55 V or more.
NG -- CHECK FOR EXHAUST GAS LEAK
OK -- Continue to next step.
8. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Start the engine and warm it up.
(e) Select the following menu items: Powertrain / Engine / Active Test / Control the Injection Volume.
(f) Change the fuel injection volume using the tester, and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the tester.
HINT
- Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range.
- The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as O2S B1S2 or O2S B2S2 on the Techstream.
Result:
HINT
A normal heated oxygen sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO
9. CHECK FOR EXHAUST GAS LEAK
OK:
No gas leak.
NG -- REPAIR OR REPLACE EXHAUST GAS LEAK POINT
OK -- Continue to next step.
10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
(a) Disconnect the J68*1 or J40*2, Q4*3 HO2 sensor connector.
HINT
- *1: Bank 1 Sensor 2
- *2: Bank 2 Sensor 2 (2WD)
- *3: Bank 2 Sensor 2 (4WD)
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Bank 1 sensor 2):
Standard resistance (Bank 2 sensor 2):
NG -- REPLACE HEATED OXYGEN SENSOR
OK -- Continue to next step.
11. INSPECT INTEGRATION RELAY (EFI MAIN RELAY)
(a) Remove the integration relay from the engine room R/B No. 2.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Reinstall the integration relay.
NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)
(a) Disconnect the J68*1 and J40*2, Q4*3 HO2 sensor connector.
HINT
- *1: Bank 1 Sensor 2
- *2: Bank 2 Sensor 2 (2WD)
- *3: Bank 2 Sensor 2 (4WD)
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Turn the engine switch off.
(e) Disconnect the A6 ECM connector.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
(g) Reconnect the HO2 sensor connector.
(h) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
13. REPLACE HEATED OXYGEN SENSOR
(a) Replace the heated oxygen sensor Removal.
NEXT -- Continue to next step.
14. PERFORM CONFIRMATION DRIVING PATTERN
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Drive the vehicle accordance with the driving pattern described in the Confirmation Driving Pattern for P0136, P0137, P0138, P0156, P0157 and P0158.
(e) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(f) Input the DTC: P0136, P0137, P0138, P0156, P0157 or P0158.
(g) Check that DTC Monitor is NORMAL. If DTC Monitor is INCOMPLETE, perform the driving pattern adding the vehicle speed.
Result:
B -- REPLACE AIR FUEL RATIO SENSOR Removal
A -- END
15. REPLACE AIR FUEL RATIO SENSOR
(a) Replace the air fuel ratio sensor Removal.
NEXT -- Continue to next step.
16. PERFORM CONFIRMATION DRIVING PATTERN
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Drive the vehicle accordance with the driving pattern described in the Confirmation Driving Pattern for P0136, P0137, P0138, P0156, P0157 and P0158.
(e) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(f) Input the DTC: P0136, P0138, P0156 or P0158.
(g) Check that DTC Monitor is NORMAL. If DTC Monitor is INCOMPLETE, perform the driving pattern adding the vehicle speed.
Result:
B -- REPLACE HEATED OXYGEN SENSOR Removal
A -- END
17. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the tester on.
(d) Select the following menu items: Select: Powertrain / Engine / Data List / A/F Control System / O2S B1S2 or O2S B2S2.
(e) Allow the engine to idle.
(f) Read the heated oxygen sensor output voltage while idling.
Result:
B -- READ VALUE USING DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN)
A -- Continue to next step.
18. INSPECT HEATED OXYGEN SENSOR
(a) Disconnect the J68*1 or J40*2, Q4*3 HO2 sensor connector.
HINT
- *1: Bank 1 Sensor 2
- *2: Bank 2 Sensor 2 (2WD)
- *3: Bank 2 Sensor 2 (4WD)
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Bank 1 sensor 2):
Standard resistance (Bank 2 sensor 2):
NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.
19. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
(a) Turn the engine switch off and wait for 5 minutes.
(b) Disconnect the A6 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(d) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal
20. READ VALUE USING DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN)
(a) Connect the Techstream to the DLC3.
(b) Clear the DTCs.
(c) Start the engine. [A]
(d) Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more [B].
(e) Drive the vehicle 37 mph (60 km/h) and decelerate the vehicle for 7 seconds or more. [C]
(f) Turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. [D]
(h) Input the DTC: P0139 or P0159.
(i) Check the DTC monitor is NORMAL. If DTC monitor is INCOMPLETE, perform the drive pattern adding the vehicle speed and using the second gear to decelerate the vehicle.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HEATED OXYGEN SENSOR Removal