2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0032 LINEAR A/F SENSOR HEATER CIRCUIT HIGH INPUT
Code No. P0032: Linear A/F Sensor Heater Circuit High Input
OPERATION
- Power is supplied to the heater power terminal of the linear A/F sensor connector from the engine control relay.
- The heater of the linear A/F sensor connector is controlled by the power transistor in the engine-ECU connector terminal LHFL.
FUNCTION
- The engine-ECU checks whether the heater current is within a specified range when the heater is on.
TROUBLE JUDGEMENT
Check Conditions
- More than 2 seconds have passed since the engine starting sequence was completed.
- While the linear A/F sensor heater is on.
- Battery positive voltage is more than 11 V and is less than 16.5 V.
Judgement Criterion
- The linear A/F sensor heater current is more than 10.5 A for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
PROBABLE CAUSES
- Failed linear A/F sensor heater
- Short circuit in linear A/F sensor heater circuit or loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check linear A/F sensor itself.
STEP 2. Check of short to power supply in power supply line between engine control relay connector and linear A/F sensor connector.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Check of short to power supply in LHFL line between linear A/F sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 4. Repair the connector(s) or wiring harness.
STEP 4. M.U.T.-IIISE diagnosis code
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