Dtc P1238 Injector Malfunction. Corolla Auris

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P1238)

CHECK HARNESS AND CONNECTOR (ENGINE WIRE HARNESS)

READ VALUE OF INJECTION VOLUME (COMPENSATION OF INJECTION VOLUME BETWEEN CYLINDERS)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (INJECTION CUT FOR IDENTIFYING MALFUNCTIONING CYLINDER)

CHECK CYLINDER COMPRESSION PRESSURE OF MALFUNCTIONING CYLINDER

CHECK IF DTC OUTPUT RECURS (DTC P1238)

REPLACE INJECTOR ASSEMBLY

DESCRIPTION

УКАЗАНИЕ:

For more information on the injector and the common rail system, refer to the system description (See page Нажмите здесь).

УКАЗАНИЕ:

1. A cylinder which has an injection volume compensation value that varies from other cylinders may be malfunctioning.
   
2. If DTC P0093 (Fuel leaks in high-pressure area) is present simultaneously, a leakage malfunction of the injector for the affected cylinder probably has occurred.
   
3. If DTC P0200 (Open or short in EDU or injector circuit) is present simultaneously, there probably is a fault in the circuit between the ECM and the injector. This fault may also be as a result of the EDU.
   
4. If only DTC P1238 (Injector malfunction) is present, the probable cause is an injector mechanical malfunction or insufficient compression (valve, etc.), not an open or short malfunction of the ECM, EDU and injector circuit.
   
5. The solenoid valve of the injector is the same type as that of the pressure discharge valve.
   

УКАЗАНИЕ:

After confirming DTC P1238, check the internal fuel pressure by selecting the following menus on the intelligent tester: "Powertrain / Engine and ECT / Data List / Fuel Press".

MONITOR DESCRIPTION

1. P1238 (Injection malfunction, except open or short in injector circuit):
   This DTC will be set if the engine speed fluctuation between each cylinder is large. The ECM monitors changes in the crankshaft rotation speed using the crankshaft position sensor in order to detect improper combustion. The camshaft position sensor also plays a role in determining which cylinder has the problem. The fluctuation counter increments when irregular crankshaft rotation speed variation exceeds the threshold with the engine idling. Therefore, if any one of the cylinders is operating poorly (rough idle), the ECM sets this DTC.
   

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

УКАЗАНИЕ:

The number of irregular changes in the crankshaft rotation speed indicates the insufficient combustion.

INSPECTION PROCEDURE

ПРИМЕЧАНИЕ:

After replacing an injector, the ECM needs registration (See page Нажмите здесь).

УКАЗАНИЕ:

1. If DTCs other than P1238 are present simultaneously, first perform troubleshoot for those DTCs.
   
2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
   

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the tester on.
   

3. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

4. Read the DTCs.
   
   

   Result:

   
   

   Result	Proceed to
   DTC P1238 is output	A
   DTC P1238 and other DTCs are output	B

   УКАЗАНИЕ:

   If any other codes besides P1238 are output, perform troubleshooting for those DTCs first.

УКАЗАНИЕ:

Check the wire harness and connector connections.

OK:

The wire harness and connectors are connected securely.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the tester on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Data List / Injection Feedback Val #1, #2, #3, and #4.
   

4. Read the value.
   

   Standard value:

   Item	Standard Value
   Compensatory Injection Volume	4.9 mm3 or less

   УКАЗАНИЕ:

   A typical injection compensation value is 3.5 mm³ or less.

5. Cylinders that have a compensation value which is more than the value specified above are considered to be faulty. Use the following steps to inspect and repair the cylinder.
   
   

   Result:

   
   

   Result	Proceed to
   Faulty cylinder is not identified	A
   Faulty cylinder is identified	B

1. Connect the intelligent tester to the DLC3.
   

2. Start the engine.
   

3. Turn the tester on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Cylinder #1 (to #4) Fuel Cut.
   

5. Check the four cylinders in sequence to identify a faulty cylinder by performing the power balance inspection.
   

   УКАЗАНИЕ:

   If the engine idle does not change when an injector is disabled, the cylinder being tested is malfunctioning.

1. Check the cylinder compression pressure (See page Нажмите здесь).
   

   Standard pressure:

   2500 kPa (25.5 kgf/cm², 362 psi)
   

   Minimum pressure:

   2200 kPa (22.5 kgf/cm², 320 psi)
   

   Difference between each cylinder:

   500 kPa (5.0 kgf/cm², 71 psi)
   

УКАЗАНИЕ:

After clearing the DTCs, let the engine idle for 10 minutes after warm-up, and then confirm that P1238 does not recur.

1. Replace the injector assembly (See page Нажмите здесь).