Code No. P0203: No. 3 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. 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 Condition

Engine speed 50 - 1,000 r/mim.

Throttle position sensor output 1.15 V or less.

MUT-II/III not in forced drive (actuator test) mode.

Judgment Criterion

No surge voltage of the injector detected for 4 seconds.

PROBABLE CAUSE

Failed No. 3 injector

Open/short circuit in No. 3 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 03: No. 3 injector

OK: Idling state varies.

Q: Is the check result normal?

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

).
NO: Go to Step 2

STEP 2. Connector check: B-04 No. 3 injector connector

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Perform resistance measurement B-04 No. 3 injector connector.

Disconnect connector, and measure at injector side.

Resistance between terminal No. 1 and No. 2.

OK: 13 - 16 Ω

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Replace No. 3 injector.

STEP 4. Perform voltage measurement at B-04 No. 3 injector connector.

Disconnect connector, and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES: Go to Step 6

.
NO: Go to Step 5

STEP 5. Connector check: 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-04 (terminal No. 1) No. 3 injector connector.

Check power supply line for open/short circuit.

NO: Repair.

STEP 6. Connector check: 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 (terminal No. 1) engine control relay connector and B-04 (terminal No. 1) No. 3 injector connector.

Check power supply line for damage.

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Repair.

STEP 8. Connector check: 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 B-04 (terminal No. 2) No. 3 injector connector and C-112 (terminal No. 24) engine-A/T-ECU connector.

Check output line for open/short circuit and damage.

Q: Is the check result normal?

YES: Go to Step 10

.
NO: Repair.

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

Engine: Idling

Selector lever position: P

Voltage between terminal No. 24 and earth.

OK: Wave pattern 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. P0203: No. 3 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. 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 Condition Engine speed 50 - 1,000 r/mim. Throttle position sensor output 1.15 V or less. MUT-II/III not in forced drive (actuator test) mode. Judgment Criterion No surge voltage of the injector detected for 4 seconds.
PROBABLE CAUSE Failed No. 3 injector Open/short circuit in No. 3 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 03: No. 3 injector OK: Idling state varies. Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Go to Step 2 .
	STEP 2. Connector check: B-04 No. 3 injector connector
	Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Perform resistance measurement B-04 No. 3 injector connector.
	Disconnect connector, and measure at injector side. Resistance between terminal No. 1 and No. 2. OK: 13 - 16 Ω Q: Is the check result normal? YES: Go to Step 4 . NO: Replace No. 3 injector.
	STEP 4. Perform voltage measurement at B-04 No. 3 injector connector.
	Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 5 .
	STEP 5. Connector check: 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-04 (terminal No. 1) No. 3 injector connector. Check power supply line for open/short circuit. NO: Repair.
	STEP 6. Connector check: 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 (terminal No. 1) engine control relay connector and B-04 (terminal No. 1) No. 3 injector connector.
	Check power supply line for damage. Q: Is the check result normal? YES: Go to Step 8 . NO: Repair.
	STEP 8. Connector check: 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 B-04 (terminal No. 2) No. 3 injector connector and C-112 (terminal No. 24) engine-A/T-ECU connector.
	Check output line for open/short circuit and damage. Q: Is the check result normal? YES: Go to Step 10 . NO: Repair.
	STEP 10. Perform signal wave pattern measurement at C-112 engine-A/T-ECU connector (Use oscilloscope).
	Engine: Idling Selector lever position: P Voltage between terminal No. 24 and earth. OK: Wave pattern 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.