Code No. P0262: No. 1 Injector Circuit High Input

OPERATION

Power is supplied to the injector connector terminal from the engine control relay connector terminal.
The engine-ECU connector terminal INJ1 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

Engine is running.

Judgement Criterion

The coil current is more than 4.5 A with the injector driving.

FAIL-SAFE AND BACKUP FUNCTION

None

PROBABLE CAUSES

Failed No. 1 injector
Open/short circuit or harness damage in No. 1 injector circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

Item 1: No. 1 injector

OK: Idling state varies.

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. 1 injector itself.

Injector check (Refer to ).

Q. Is the check result normal?

	Go to Step 3.

	Replace the No. 1 injector.

STEP 3. Check of short circuit to power supply in INJ1 line between No. 1 injector connector and engine-ECU connector.

Q. Is the check result normal?

	Go to Step 4.

	Repair the connector(s) or wiring harness.

STEP 4. Perform signal wave pattern measurement at engine-ECU connector (Using an oscilloscope).

(1)Engine: Idling

(2)Transmission: P range

(3)Check the voltage between the engine-ECU connector (INJ1 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.