Code No. P0264: No. 2 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 INJ2 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. 2 injector
- Open/short circuit or harness damage in No. 2 injector circuit or loose connector contact
- Failed engine-ECU
|
|
STEP 1. M.U.T.-III actuator test
|
|
|
Q.
Is the check result normal?
|
|
|
 Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions  ).
|
|
|
|
|
|
 Go to Step 2.
|
|
|
|
|
|
STEP 2. Check No. 2 injector itself.
|
|
|
- Injector check (Refer to ).
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 3.
|
|
|
|
|
|
Replace the No. 2 injector.
|
|
|
|
|
|
STEP 3. Voltage measurement at No. 2 injector connector (power supply line).
|
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
|
(3)Check the voltage between the No. 2 injector connector (power supply line) and body earth.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
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. 2 injector connector.
|
|
|
|
|
|
STEP 4. Check of harness damage in power supply line between engine control relay connector and No. 2 injector connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 5. Check of short to earth, open circuit and damage in INJ2 line between No. 2 injector connector and engine-ECU connector.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 6.
|
|
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
|
|
STEP 6. Perform signal wave pattern measurement at engine-ECU connector (Using an oscilloscope).
|
|
|
(3)Check the voltage between the engine-ECU connector (INJ2 terminal) and body earth.
OK: Waveforms should be displayed on inspection procedure using an oscilloscope (Refer to ).
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
|
|
|
|
|
|
Replace the engine-ECU.
|
|
|
|