2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0134 LINEAR A/F SENSOR CIRCUIT NO ACTIVITY DETECTED
Code No. P0134: Linear A/F Sensor Circuit No Activity Detected
OPERATION
The linear A/F sensor and the engine-ECU are connected by the following 3 lines to detect the air-fuel ratio.
- The line between the linear A/F sensor and the engine-ECU connector terminal LPFL detects the air-fuel ratio.
- The auxiliary line between the linear A/F sensor and the engine-ECU connector terminal LSFL detects the air-fuel ratio.
- The line between the linear A/F sensor and the engine-ECU connector terminal LEFL is connected to earth.
FUNCTION
- The engine-ECU effects air/fuel ratio feedback control in accordance with the signals from the linear A/F sensor.
- If the linear A/F sensor has deteriorated, corrections will be made by the oxygen sensor (rear).
TROUBLE JUDGEMENT
Check Conditions
- Battery positive voltage is more than 10 V and is less than 16.5 V.
- More than 220 seconds have passed since the engine starting sequence was completed.
Judgement Criterion
- The sensor impedance is be higher than 100 Ω for 10 seconds.
or
- The sensor impedance is be lower than 50 Ω for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
- Does not control air-fuel ratio closed loop.
PROBABLE CAUSES
- Failed linear A/F sensor
- Open circuit or harness damage in linear A/F sensor circuit or loose connector contact
DIAGNOSIS PROCEDURE
STEP 1. Check of open circuit, and damage in LSFL line between linear A/F sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
STEP 2. Check of open circuit, and damage in LEFL line between linear A/F sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 3. Repair the connector(s) or wiring harness.
STEP 3. M.U.T.-IIISE diagnosis code
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