DTC P0134
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0134: O2 Sensor Circuit No Activity Detected (Sensor 1) Output voltage of HO2S-1 circuit stays between 1.25 and 3.50 V for 25 sec. (3 D/C detection logic) |
•HO2S-1 and/ or its circuit
•HO2S-1 heater •Air intake system •Exhaust system •ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B1: | HO2S-2 heater power supply circuit | 2. | HO2S-2 |
| A1: | HO2S-1 heater power supply circuit | B2: | HO2S-2 signal circuit | 3. | ECM |
| A2: | HO2S-1 signal circuit | B3: | HO2S-2 ground circuit | 4. | Shield wire |
| A3: | HO2S-1 ground circuit | B4: | HO2S-2 heater drive circuit | ||
| A4: | HO2S-1 heater drive circuit | 1. | HO2S-1 |
DTC Confirmation Procedure
WARNING:
If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.
•Select a level road with no traffic to minimize the risk of accident.
•Perform the test extremely carefully.
•Perform the road test using 2 persons, a driver and a tester.
•Perform the test extremely carefully.
•Perform the road test using 2 persons, a driver and a tester.
NOTE:
•Check that the following condition is met in this “DTC Confirmation Procedure”.
—Battery voltage > 11 V
•Check that the following DTCs are not detected in this “DTC Confirmation Procedure”.
—HO2S-1 heater (P0030, P0031 and P0032)
1)Warm up engine to normal operating temperature.
2)Drive vehicle at 50 to 80 km/h (31 to 50 mile/h) constantly for 10 min. or more.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
DTC check
Is there any DTC(s) other than P0134?
|
Go to troubleshooting for applicable DTC.
|
Go to Step 3.
|
| 3 |
Exhaust system and air intake system check
1)Check exhaust system and air intake system for clogging or leakage.
Is check result OK?
|
Go to Step 4.
|
Repair or replace defective part.
|
| 4 |
HO2S-1 signal circuit check
1)Check “A2” and “A3” circuits according to Step 3 under DTC P0131 / P0132:K14C.
Is check result OK?
|
Go to Step 5.
|
Repair or replace defective wire harness.
|
| 5 |
HO2S-1 heater recheck
1)Check HO2S-1 heater.
2)Perform “DTC Confirmation Procedure” and check DTC.
Is check result OK?
|
Go to Step 6.
|
Replace HO2S-1.
|
| 6 |
DTC recheck
1)Replace HO2S-1.
2)Perform “DTC Confirmation Procedure” and check DTC.
Is DTC P0134 still detected?
|
Replace ECM and recheck DTC.
|
End.
|