Code No. P0201: No. 1 Injector System, Code No. P0202: No. 2 Injector System, Code No. P0203: No. 3 Injector System, Code No. P0204: No. 4 Injector System

OPERATION

Power is supplied to the injector (terminal No. 1) from the engine control relay (terminal No. 1).
The engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 1, No. 5, No. 14 and No. 21) 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-ECU <M/T> or engine-A/T-ECU <A/T> 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

Injector operation (by carrying out actuator test) is not in progress.
Engine speed is 50 - 1, 000 r/min.
Throttle position sensor (main) output is 1.15 V or less.

Judgment Criterion

Injector coil surge voltage (battery positive voltage +2 V) has not been detected for 4 seconds.

PROBABLE CAUSE

Failed injector
Open/short circuit in injector circuit or loose connector contact
Failed engine-ECU <M/T>
Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-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?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).

	Go to Step 2 .

STEP 2. Check connector: Injector connector

B-101 (No. 1 injector connector)
B-102 (No. 2 injector connector)
B-104 (No. 3 injector connector)
B-105 (No. 4 injector connector)

Q. Are the check results normal?

Go to Step 3 .

Repair or replace.

STEP 3. Perform resistance measurement at injector connector.

B-101 (No. 1 injector connector)
B-102 (No. 2 injector connector)
B-104 (No. 3 injector connector)
B-105 (No. 4 injector connector)

Disconnect connector, and measure at injector side.
Resistance between terminal No. 1 and No. 2.

OK: 10.5 - 13.5 Ω

Q. Are the check results normal?

Go to Step 4 .

Replace injector.

STEP 4. Perform voltage measurement at injector connector.

B-101 (No. 1 injector connector)
B-102 (No. 2 injector connector)
B-104 (No. 3 injector connector)
B-105 (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?

Go to Step 6 .

Go to Step 5 .

STEP 5. Check connector: B-15X engine control relay connector

Q. Is the check result normal?

Check intermediate connector C-116, and repair if necessary. If intermediate connector is normal, check and repair harness between B-15X (terminal No. 1) engine control relay connector and B-101 (terminal No. 1) No. 1 injector connector.
Check intermediate connector C-116, and repair if necessary. If intermediate connector is normal, check and repair harness between B-15X (terminal No. 1) engine control relay connector and B-102 (terminal No. 1) No. 2 injector connector.
Check intermediate connector C-116, and repair if necessary. If intermediate connector is normal, check and repair harness between B-15X (terminal No. 1) engine control relay connector and B-104 (terminal No. 1) No. 3 injector connector.
Check intermediate connector C-116, and repair if necessary. If intermediate connector is normal, check and repair harness between B-15X (terminal No. 1) engine control relay connector and B-105 (terminal No. 1) No. 4 injector connector.

Check power supply line for open/short circuit.

Repair or replace.

STEP 6. Check connector: B-15X engine control relay connector

Q. Is the check result normal?

Go to Step 7 .

Repair or replace.

STEP 7. Check harness between B-15X engine control relay connector and injector connector.

note

Before checking harness, check intermediate connector C-116, and repair if necessary.

Check harness between B-15X (terminal No. 1) engine control relay connector and B-101 (terminal No. 1) No. 1 injector connector.
Check harness between B-15X (terminal No. 1) engine control relay connector and B-102 (terminal No. 1) No. 2 injector connector.
Check harness between B-15X (terminal No. 1) engine control relay connector and B-104 (terminal No. 1) No. 3 injector connector.
Check harness between B-15X (terminal No. 1) engine control relay connector and B-105 (terminal No. 1) No. 4 injector connector.

Check power supply line for damage.

Q. Are the check results normal?

Go to Step 8 .

Repair.

STEP 8. Check connector: C-110 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

Go to Step 9 .

Repair or replace.

STEP 9. Check harness between injector connector and C-110 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector.

Check harness between B-101 (terminal No. 2) No. 1 injector connector and C-110 (terminal No. 1) engine-ECU <M/T> or engine-A/T-ECU <A/T> connector.
Check harness between B-102 (terminal No. 2) No. 2 injector connector and C-110 (terminal No. 5) engine-ECU <M/T> or engine-A/T-ECU <A/T> connector.
Check harness between B-104 (terminal No. 2) No. 3 injector connector and C-110 (terminal No. 14) engine-ECU <M/T> or engine-A/T-ECU <A/T> connector.
Check harness between B-105 (terminal No. 2) No. 4 injector connector and C-110 (terminal No. 21) engine-ECU <M/T> or engine-A/T-ECU <A/T> connector.

Check output line for open/short circuit and damage.

Q. Are the check results normal?

Go to Step 10 .

Repair.

STEP 10. Perform signal wave pattern measurement at C-110 engine-ECU <M/T> or engine-A/T-ECU <A/T> connector (Using an oscilloscope).

Engine: Idling
Transmission: Neutral <M/T> or P range <A/T>

Voltage between terminal No. 1 and earth (No. 1 Injector)
Voltage between terminal No. 5 and earth (No. 2 Injector)
Voltage between terminal No. 14 and earth (No. 3 Injector)
Voltage between terminal No. 21 and earth (No. 4 Injector)

OK: Waveforms should be display 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

Replace engine-ECU <M/T> or engine-AT-ECU <A/T>.