Code No. P0276: No. 6 Injector Circuit Low Input
OPERATION
- Power is supplied to the injector connector terminal from the engine control relay connector terminal.
- The engine-ECU connector terminal INJ6 makes the power transistor in the unit be in ON position, and that makes currents go on the injector connector terminal.
FUNCTION
- The engine-ECU controls the power supply interval of the injector.
- The fuel injection amount of the injector depends on the power supply interval.
TROUBLE JUDGEMENT
Check Condition
Judgement Criterion
- The supply voltage is less than 3 V without the injector driving.
FAIL-SAFE AND BACKUP FUNCTION
PROBABLE CAUSES
- Failed No. 6 injector
- Open/short circuit or harness damage in No. 6 injector circuit or loose connector contact
- Failed engine-ECU
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STEP 1. M.U.T.-III actuator test
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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Go to Step 2.
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STEP 2. Check No. 6 injector itself.
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- Injector check (Refer to
).
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the No. 6 injector.
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STEP 3. Voltage measurement at No. 6 injector connector (power supply line).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(3)Check the voltage between the No. 6 injector connector (power supply line) and body earth. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Repair or replace the connector(s), or check and repair the harness of short to earth, and open circuit in power supply line between engine control relay connector and No. 6 injector connector.
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STEP 4. Check of harness damage in power supply line between engine control relay connector and No. 6 injector connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring harness.
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STEP 5. Check of short to earth, open circuit and damage in INJ6 line between No. 6 injector connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness.
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STEP 6. Perform signal wave pattern measurement at engine-ECU connector (Using an oscilloscope).
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(3)Check the voltage between the engine-ECU connector (INJ6 terminal) and body earth. OK: Waveforms should be displayed on inspection procedure using an oscilloscope (Refer to ).
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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Replace the engine-ECU.
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