ECD SYSTEM, Diagnostic DTC:P0263, P0266, P0269, P0272

DTC Code	DTC Name
P0263	Cylinder Balancing Controller Output of Cylinder 1 not within Normal Value Range
P0266	Cylinder Balancing Controller Output of Cylinder 2 not within Normal Value Range
P0269	Cylinder Balancing Controller Output of Cylinder 3 not within Normal Value Range
P0272	Cylinder Balancing Controller Output of Cylinder 4 not within Normal Value Range

DESCRIPTION

The injector injects the amount of the fuel calculated by the ECM into each cylinder.

A piezo-electric actuator, which is built into the injector, has characteristics that allow a fast response when voltage (70 V) is applied. Therefore, fuel injection can be performed quickly and accurately. (Refer to Fig. 1)

When no voltage is applied to the injector, the control piston is pressed to the top due to the force of the return spring. As a result, the fuel pressure values in the control chamber and the needle high pressure chamber become the same, and the needle control piston and injector needle are pressed downward due to the force of the return spring. Therefore, the injection needle is closed to stop fuel injection. (Refer to Fig. 2)

When voltage is applied to the injector, the piezo-electric actuator presses down the control piston. The pressure in the control chamber decreases because the high-pressure fuel in the control chamber is discharged. The fuel pressure in the needle high pressure chamber exceeds the force of the injection needle return spring, and the needle control piston and the injector needle are pressed upward to start fuel injection from the injection port. (Refer to Fig.3)

When voltage being applied to the injector is stopped, the needle control piston and the injector needle are pressed down again to close the injection port and stop fuel injection.

DTC No.	DTC Detection Condition	Trouble Area	Possible to Detect
DTC No.	DTC Detection Condition	Trouble Area	Ignition Switch	Engine Run
P0263	The injection correction value for No.1 cylinder is below 60%, or 140% or more.	Injector Injector circuit Cylinder compression pressure Supply pump Fuel filter Fuel pipe and hose (leaked, blocked, damaged, disconnected, bent, etc.) Priming pump ECM	-	-
P0266	The injection correction value for No.2 cylinder is below 60%, or 140% or more.	Injector Injector circuit Cylinder compression pressure Supply pump Fuel filter Fuel pipe and hose (leaked, blocked, damaged, disconnected, bent, etc.) Priming pump ECM	-	-
P0269	The injection correction value for No.3 cylinder is below 60%, or 140% or more.	Injector Injector circuit Cylinder compression pressure Supply pump Fuel filter Fuel pipe and hose (leaked, blocked, damaged, disconnected, bent, etc.) Priming pump ECM	-	-
P0272	The injection correction value for No.4 cylinder is below 60%, or 140% or more.	Injector Injector circuit Cylinder compression pressure Supply pump Fuel filter Fuel pipe and hose (leaked, blocked, damaged, disconnected, bent, etc.) Priming pump ECM	-	-

Reference:

The waveform between terminals #10 to #40 and PINJ1 to PINJ4 of ECM connectors when idling.

CAUTION:

Do not reuse the injection pipe. Be sure to replace it with a new one.
Do not reuse the injection nozzle seat. If the injector has been removed, be sure to replace the injector nozzle seat with a new one.
The injector is controlled by a voltage of +/- 70 V.
Be sure to connect the injector connectors correctly to prevent malfunctions in the injector.
Do not use any power source other than the ECM for the injector.
Do not apply voltage to the injector while it is not grounded to body.
Do not disassemble the injector.
Do not use the ultrasonic cleaning tool to clean the injector.

FAIL-SAFE

DTC No.	Fail-safe Operation	Fail-safe Deactivation Condition
P0263	The last learning value is used as the injector correction value.	Over 1,500 rpm stop the correction.
P0266	The last learning value is used as the injector correction value.	Over 1,500 rpm stop the correction.
P0269	The last learning value is used as the injector correction value.	Over 1,500 rpm stop the correction.
P0272	The last learning value is used as the injector correction value.	Over 1,500 rpm stop the correction.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

When DTC P0263, P0266, P0269 or P0272 is detected, check the corrected injection volume by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Corr Inj Vol # 1 to 4.
If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.
Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE

CHECK DTC OUTPUT (OTHER THAN P0263, P0266, P0269 AND/OR P0272)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the intelligent tester on.
Select the following menu items: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result

Display (DTC Output)	Proceed to
P0263, P0266, P0269 and/or P0272	A
"P0263, P0266, P0269 and/or P0272" and other DTCs	B

Tech Tips

If any other codes besides P0263, P0266, P0269 and P0272 are output, perform the troubleshooting for those DTCs first.

GO TO DTC CHART

CHECK IF ENGINE STARTS

Check if the engine starts.
If the engine cannot be started, disconnect the injector connector of the cylinder indicated by the DTC (First condition).

Recheck if the engine starts (Second condition).

Result

First Condition	Second Condition	Proceed to
Engine starts.	-	A
Engine does not start.	Engine starts.	B
Engine does not start.	Engine does not start.	C

REPLACE INJECTOR (FOR CORRESPONDING CYLINDER)

CHECK INJECTOR Click here

READ VALUE OF INTELLIGENT TESTER (CORRECTED INJECTION VOLUME)

Warm up the engine.
Connect the intelligent tester to the DLC3.
Start the engine and turn the A/C switch off.
Turn the intelligent tester on.
Wait at least one minute.
Select the following menu items: Powertrain / Engine and ECT / Corr Inj Vol #1.

Read the No.1 cylinder value with engine idling.

Result

Display (DTC Output)	Proceed to
60 to 140%	A
Other than above	B

Tech Tips

Inspect the other cylinders by following the same procedure.

Only the cylinders for which the inspection results are not within 60 to 140% need further inspection. Proceed to step 4.

CHECK INJECTOR Click here

CHECK FOR INTERMITTENT PROBLEMS

CHECK INJECTOR

Disconnect the N1, N2, N3 and N4 injector connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Specified Condition
1 - 2	150 to 250 kΩ

Tech Tips

Mainly inspect the cylinders for which the check results in step 3 are not as specified.

REPLACE INJECTOR (S)

CHECK HARNESS AND CONNECTOR (INJECTOR - ECM)

Disconnect the B54 ECM connector.
Disconnect the N1, N2, N3 and N4 injector connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Check for open

Tester Connection	Specified Condition
#10 (B54-28) - Injector (No.1) (N1-1)	Below 1 Ω
PINJ1 (B54-29) - Injector (No.1) (N1-2)	Below 1 Ω
#20 (B54-25) - Injector (No.2) (N2-1)	Below 1 Ω
PINJ2 (B54-30) - Injector (No.2) (N2-2)	Below 1 Ω
#30 (B54-26) - Injector (No.3) (N3-1)	Below 1 Ω
PINJ3 (B54-32) - Injector (No.3) (N3-2)	Below 1 Ω
#40 (B54-27) - Injector (No.4) (N4-1)	Below 1 Ω
PINJ4 (B54-31) - Injector (No.4) (N4-2)	Below 1 Ω

Check for short

Tester Connection	Specified Condition
#10 (B54-28) or Injector (No.1) (N1-1) - Body ground	10 kΩ or higher
PINJ1 (B54-29) or Injector (No.1) (N1-2) - Body ground	10 kΩ or higher
#20 (B54-25) or Injector (No.2) (N2-1) - Body ground	10 kΩ or higher
PINJ2 (B54-30) or Injector (No.2) (N2-2) - Body ground	10 kΩ or higher
#30 (B54-26) or Injector (No.3) (N3-1) - Body ground	10 kΩ or higher
PINJ3 (B54-32) or Injector (No.3) (N3-2) - Body ground	10 kΩ or higher
#40 (B54-27) or Injector (No.4) (N4-1) - Body ground	10 kΩ or higher
PINJ4 (B54-31) or Injector (No.4) (N4-2) - Body ground	10 kΩ or higher

Tech Tips

Mainly inspect the cylinders for which the check results in step 3 are not as specified.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK CYLINDER COMPRESSION PRESSURE
1. Check the cylinder compression pressure.
  
  Tech Tips
  
  Mainly inspect the cylinders for which the check results in step 3 are not as specified.
NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK
CHECK SUPPLY PUMP
1. Check the supply pump Click here.
NG
REPAIR OR REPLACE SUPPLY PUMP

OK
CHECK FUEL FILTER (BLOCKAGE)
1. Check the fuel filter for blockage.
NG
REPLACE FUEL FILTER

OK
CHECK FUEL PIPE AND HOSE
1. Check that there are no leaks from the fuel pipes and hoses and that they are not damaged, disconnected or bent.
NG
REPLACE FUEL PIPE AND HOSE

OK
CHECK PRIMING PUMP
1. Check the priming pump.
NG
REPLACE PRIMING PUMP

OK
REPLACE INJECTOR

NEXT

READ VALUE OF INTELLIGENT TESTER (CORRECTED INJECTION VOLUME)

Warm up the engine.
Connect the intelligent tester to the DLC3.
Start the engine and turn the A/C switch off.
Turn the intelligent tester on.
Wait at least one minute.
Select the following menu items: Powertrain / Engine and ECT / Corr Inj Vol #1 to 4.

Read the cylinder value with the engine idling.

Result

Display	Proceed To
60 to 140%	A
Other than above	B

REPLACE ECM

END