The cylinder which has the compensation value for Injection Feedback Val #1, #2, #3, #4, #5, #6, #7 and #8 that varies from the other cylinders may be malfunctioning.

If DTC P0093 (fuel leaks from high-pressure area) is stored simultaneously, a leakage malfunction of the cylinder has probably occurred.

If DTC P062D (open or short in the No. 1 injector driver (EDU) or fuel injector circuit) is stored simultaneously, there is probably a faulty circuit located between the ECM and the fuel injector including the No. 1 EDU.

If DTC P062E (open or short in the No. 2 injector driver (EDU) or fuel injector circuit) is stored simultaneously, there is probably a faulty circuit located between the ECM and the fuel injector including the No. 2 EDU.

If only DTC P1238 (injector malfunction) has been stored, a fuel injector mechanical malfunction or insufficient compression (valve clearance, etc.) has probably occurred. An open or short malfunction of the ECM, EDU or fuel injector circuit is unlikely.

P1238
DTC Detection Drive Pattern	DTC Detection Condition	Main Trouble Area	Related Trouble Area
Warm up the engine and idle it for 60 seconds	A large engine speed fluctuation when idling continues for 60 seconds (2 trip detection logic).	Fuel injector Injector driver (EDU) (P062D and/or P062E set simultaneously) Connector connection (P062D and/or P062E set simultaneously) Compression pressure	Valve timing Fuel with low cetane number used ECM

Related Data List
DTC No.	Data List
P1238	Injection Volume Injection Feedback Val #1 to #8

HINT:

If DTC P1238 is stored, the following symptoms may appear:

Rough idle

Poor driveability

After confirming DTC P1238, check the internal fuel pressure on the intelligent tester by entering the following menus: Powertrain / Engine / Data List / Fuel Press, Target Common Rail Pressure.
Under a stable condition such as idling or running the engine at 2500 rpm without load, Fuel Press is within +/-5 MPa of Target Common Rail Pressure.

MONITOR DESCRIPTION

P1238 (Injection malfunction, except open or short in fuel injector circuit):

This DTC will be stored 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 increases 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 stores this DTC.

WIRING DIAGRAM

Refer to DTC P062D ().

INSPECTION PROCEDURE

NOTICE:

After replacing a fuel injector, the ECM needs registration ().

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1238)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Enter the following menus: Powertrain / Engine / DTC.

Read the DTCs.

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

HINT:

If any DTCs other than P1238 are output, troubleshoot those DTCs first.

If DTCs other than P1238 are not output, check the fuel condition before proceeding to the next step.

GO TO DTC CHART ()

A

2.CHECK HARNESS AND CONNECTOR (ENGINE WIRE HARNESS)

Check the wire harness and connector connections.

OK:
The wire harness and connectors have been connected securely and there are good connections.

Go to step 9

OK

3.READ VALUE USING INTELLIGENT TESTER (COMPENSATORY INJECTION VOLUME FOR EACH CYLINDER)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Start the engine and warm it up (engine coolant temperature is 75°C (167°F) or more), and then idle the engine for 1 minute or more.

Enter the following menus: Powertrain / Engine / Data List / Injection Feedback Val #1 to #8.

Read the value.

Standard value:
The compensatory injection volume is from -3.0 to 3.0 mm³/st.

HINT:

If the fuel injector is malfunctioning, the compensatory injection volume remains at -5.0 or 5.0 mm³/st.

The compensatory injection volume is usually from -3.0 to 3.0 mm³/st.

The numbers of the Data List item Injection Feedback Val #1 to #8 do not match the cylinder numbers (refer to the Diesel Injection section of the Data List) ().

Any cylinders that have a higher compensatory injection volume than shown above are considered to be faulty. Use the following steps to inspect and repair the cylinders.

NEXT

4.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FUEL CUT FOR IDENTIFYING MALFUNCTION CYLINDER)

Connect the intelligent tester to the DLC3.

Start the engine and turn the tester on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Cylinder #1 to #8 Fuel Cut.

Check the 8 cylinders in sequence to identify a faulty cylinder by performing the power-balance inspection.

HINT:

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

If the cylinder being tested is normal, there will be a significant change in idle speed when the fuel injection is stopped for that cylinder.

NEXT

5.CHECK CYLINDER COMPRESSION PRESSURE OF MALFUNCTIONING CYLINDER

Check the cylinder compression pressure ().

Go to step 10

OK

6.REPLACE FUEL INJECTOR

Replace the fuel injector ().

NEXT

7.CHECK WHETHER DTC OUTPUT RECURS (DTC P1238)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Clear the DTCs ().

Turn the ignition switch off.

Start the engine.

Switch the ECM from normal mode to check mode ().

Warm up the engine (engine coolant temperature is 75°C (167°F) or more) and idle it for 60 seconds.

Enter the following menus: Powertrain / Engine / DTC.

Read the DTCs.

Result
Result	Proceed to
P1238 is output	A
No DTC is output	B

END

A

8.REPLACE ECM

Replace the ECM ().

Go to step 11

9.REPAIR OR REPLACE HARNESS OR CONNECTOR

Go to step 11

10.CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

NEXT

11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs ().

Turn the ignition switch off.

Start the engine.

Warm up the engine and idle it for 60 seconds.

Confirm that the DTC is not output again.

HINT:

Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Input DTC P1238.

Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase idling time.

END

Dtc P1238 Injector Malfunction

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

DTC P1238 Injector Malfunction

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE