Code No. 41 Injector System

OPERATION

Power is supplied to the injector (terminal No. 1) from the engine control relay (terminal No. 1).

The engine-A/T-ECU (terminal No. 1, No. 2, No. 9 and No. 24) makes the power transistor in the unit be in "ON" position, and that makes currents go on the injector (terminal No. 2).

FUNCTION

The engine-A/T-ECU controls the power supply interval of the injector.

The fuel injection amount of the injector depends on the power supply interval.

TROUBLE JUDGMENT

Check Conditions

Fuel cut and injector not in forced drive (actuator test) mode.

Engine speed 50 - 1,000 r/min.

Throttle position sensor output 1.15 V or less.

Judgment Criterion

No surge voltage of the injector detected for 4 seconds.

PROBABLE CAUSE

Failed injector

Open/short circuit in injector circuit or loose connector contact

Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III actuator test

Refer to Actuator test reference table list .

Item 01: No. 1 injector

Item 02: No. 2 injector

Item 03: No. 3 injector

Item 04: No. 4 injector

OK: Idling state varies.

Q: Are the check results normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Go to Step 2

STEP 2. Check connector: Injector connector

B-01 (No. 1 injector connector)

B-02 (No. 2 injector connector)

B-04 (No. 3 injector connector)

B-05 (No. 4 injector connector)

Q: Are the check results normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Perform resistance measurement at injector connector.

B-01 (No. 1 injector connector)

B-02 (No. 2 injector connector)

B-04 (No. 3 injector connector)

B-05 (No. 4 injector connector)

Disconnect connector, and measure at injector side.

Resistance between terminal No. 1 and No. 2.

OK: 13 - 16 Ω

Q: Are the check results normal?

YES: Go to Step 4

.
NO: Replace injector.

STEP 4. Perform voltage measurement at injector connector.

B-01 (No. 1 injector connector)

B-02 (No. 2 injector connector)

B-04 (No. 3 injector connector)

B-05 (No. 4 injector connector)

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Are the check results normal?

YES: Go to Step 6

.
NO: Go to Step 5

STEP 5. Check connector: B-17X engine control relay connector

Q: Is the check result normal?

YES:

Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-01 (terminal No. 1) No. 1 injector connector.

Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-02 (terminal No. 1) No. 2 injector connector.

Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-04 (terminal No. 1) No. 3 injector connector.

Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-05 (terminal No. 1) No. 4 injector connector.

Check power supply line for open/short circuit.

NO: Repair.

STEP 6. Check connector: B-17X engine control relay connector

Q: Is the check result normal?

YES: Go to Step 7

.
NO: Repair.

STEP 7. Check harness between B-17X engine control relay connector and injector connector.

Check harness between B-17X (terminal No. 1) engine control relay connector and B-01 (terminal No. 1) No. 1 injector connector.

Check harness between B-17X (terminal No. 1) engine control relay connector and B-02 (terminal No. 1) No. 2 injector connector.

Check harness between B-17X (terminal No. 1) engine control relay connector and B-04 (terminal No. 1) No. 3 injector connector.

Check harness between B-17X (terminal No. 1) engine control relay connector and B-05 (terminal No. 1) No. 4 injector connector.

Check power supply line for damage.

Q: Are the check results normal?

YES: Go to Step 8

.
NO: Repair.

STEP 8. Check connector: C-112 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Repair.

STEP 9. Check harness between injector connector and C-127 engine-A/T-ECU connector.

Check harness between B-01 (terminal No. 2) No. 1injector connector and C-112 (terminal No. 1) engine-A/T-ECU connector.

Check harness between B-02 (terminal No. 2) No. 2 injector connector and C-112 (terminal No. 9) engine-A/T-ECU connector.

Check harness between B-04 (terminal No. 2) No. 3 injector connector and C-112 (terminal No. 24) engine-A/T-ECU connector.

Check harness between B-05 (terminal No. 2) No. 4 injector connector and C-112 (terminal No. 2) engine-A/T-ECU connector.

Check output line for open/short circuit and damage.

Q: Are the check results normal?

YES: Go to Step 10

.
NO: Repair.

STEP 10. Signal wave pattern measurement at C-112 engine-A/T-ECU connector (Use oscilloscope).

Engine: Idling

Selector lever position: P

Voltage between terminal No. 1 and earth.

OK: Waveforms should be display on Inspection procedure using an oscilloscope (Refer to

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Replace engine-A/T-ECU.


Code No. 41 Injector System

OPERATION Power is supplied to the injector (terminal No. 1) from the engine control relay (terminal No. 1). The engine-A/T-ECU (terminal No. 1, No. 2, No. 9 and No. 24) makes the power transistor in the unit be in "ON" position, and that makes currents go on the injector (terminal No. 2).
FUNCTION The engine-A/T-ECU controls the power supply interval of the injector. The fuel injection amount of the injector depends on the power supply interval.
TROUBLE JUDGMENT Check Conditions Fuel cut and injector not in forced drive (actuator test) mode. Engine speed 50 - 1,000 r/min. Throttle position sensor output 1.15 V or less. Judgment Criterion No surge voltage of the injector detected for 4 seconds.
PROBABLE CAUSE Failed injector Open/short circuit in injector circuit or loose connector contact Failed engine-A/T-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. MUT-II/III actuator test Refer to Actuator test reference table list . Item 01: No. 1 injector Item 02: No. 2 injector Item 03: No. 3 injector Item 04: No. 4 injector OK: Idling state varies. Q: Are the check results normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Go to Step 2 .
	STEP 2. Check connector: Injector connector
	B-01 (No. 1 injector connector) B-02 (No. 2 injector connector) B-04 (No. 3 injector connector) B-05 (No. 4 injector connector) Q: Are the check results normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Perform resistance measurement at injector connector.
	B-01 (No. 1 injector connector) B-02 (No. 2 injector connector) B-04 (No. 3 injector connector) B-05 (No. 4 injector connector) Disconnect connector, and measure at injector side. Resistance between terminal No. 1 and No. 2. OK: 13 - 16 Ω Q: Are the check results normal? YES: Go to Step 4 . NO: Replace injector.
	STEP 4. Perform voltage measurement at injector connector.
	B-01 (No. 1 injector connector) B-02 (No. 2 injector connector) B-04 (No. 3 injector connector) B-05 (No. 4 injector connector) Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: System voltage Q: Are the check results normal? YES: Go to Step 6 . NO: Go to Step 5 .
	STEP 5. Check connector: B-17X engine control relay connector
	Q: Is the check result normal? YES: Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-01 (terminal No. 1) No. 1 injector connector. Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-02 (terminal No. 1) No. 2 injector connector. Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-04 (terminal No. 1) No. 3 injector connector. Check and repair harness between B-17X (terminal No. 1) engine control relay connector and B-05 (terminal No. 1) No. 4 injector connector. Check power supply line for open/short circuit. NO: Repair.
	STEP 6. Check connector: B-17X engine control relay connector
	Q: Is the check result normal? YES: Go to Step 7 . NO: Repair.
	STEP 7. Check harness between B-17X engine control relay connector and injector connector.
	Check harness between B-17X (terminal No. 1) engine control relay connector and B-01 (terminal No. 1) No. 1 injector connector. Check harness between B-17X (terminal No. 1) engine control relay connector and B-02 (terminal No. 1) No. 2 injector connector. Check harness between B-17X (terminal No. 1) engine control relay connector and B-04 (terminal No. 1) No. 3 injector connector. Check harness between B-17X (terminal No. 1) engine control relay connector and B-05 (terminal No. 1) No. 4 injector connector. Check power supply line for damage. Q: Are the check results normal? YES: Go to Step 8 . NO: Repair.
	STEP 8. Check connector: C-112 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 9 . NO: Repair.
	STEP 9. Check harness between injector connector and C-127 engine-A/T-ECU connector.
	Check harness between B-01 (terminal No. 2) No. 1injector connector and C-112 (terminal No. 1) engine-A/T-ECU connector. Check harness between B-02 (terminal No. 2) No. 2 injector connector and C-112 (terminal No. 9) engine-A/T-ECU connector. Check harness between B-04 (terminal No. 2) No. 3 injector connector and C-112 (terminal No. 24) engine-A/T-ECU connector. Check harness between B-05 (terminal No. 2) No. 4 injector connector and C-112 (terminal No. 2) engine-A/T-ECU connector. Check output line for open/short circuit and damage. Q: Are the check results normal? YES: Go to Step 10 . NO: Repair.
	STEP 10. Signal wave pattern measurement at C-112 engine-A/T-ECU connector (Use oscilloscope).
	Engine: Idling Selector lever position: P Voltage between terminal No. 1 and earth. OK: Waveforms should be display on Inspection procedure using an oscilloscope (Refer to ). Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Replace engine-A/T-ECU.