DTC P0136 / P0137 / P0138 / P0140
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detection condition | Trouble area |
|---|---|
|
P0136: O2 Sensor Circuit (Sensor 2) Measured voltages of A/F sensor-2 signal circuits are lower than specified value. (3 D/C detecting logic) |
•A/F sensor-2 and/or its circuit
•ECM |
|
P0137: O2 Sensor Circuit Low Voltage (Sensor 2) Measured voltages of A/F sensor-2 signal circuits are out of specified range. (3 D/C detecting logic) |
|
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P0138: O2 Sensor Circuit High Voltage (Sensor 2) Measured voltages of A/F sensor-2 signal circuits are higher than specified value. (3 D/C detecting logic) |
|
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P0140: O2 Sensor Circuit No Activity Detected (Sensor 2) ECM has internal fault. (SPI chip malfunction) (3 D/C detecting logic) |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A3: | A/F sensor-2 signal circuit (IPN) | B2: | A/F sensor-2 heater drive circuit |
| A1: | A/F sensor-2 signal circuit (RT) | A4: | A/F sensor-2 signal circuit (RE+) | 1. | ECM |
| A2: | A/F sensor-2 signal circuit (APE) | B1: | A/F sensor-2 heater power supply circuit | 2. | A/F sensor-2 |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
DTC check
If there any DTC (s) other than P0136, P0137, P0138 and P0140?
|
Go to troubleshooting for applicable DTC.
|
Go to Step 3.
|
| 3 |
A/F sensor-2 signal circuit check
1)Check “A1”, “A2”, “A3” and “A4” circuits according to Step 3 of A/F Sensor-2 Check:D16AA.
Is check result OK?
|
Go to Step 4.
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Repair or replace defective wire harness.
|
| 4 |
A/F sensor-2 replacement
1)Replace A/F sensor-2.
2)Clear DTC.
3)Set ignition “OFF”.
4)Check DTCs.
Is DTC P0136, P0137, P0138 or P0140 still detected?
|
Replace ECM and recheck DTC.
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End.
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