Isuzu KB P190. Manual - part 453

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-195

DTC P0602 (Flash Code 154)

Circuit Description

The electrically erasable & programmable read only
memory (EEPROM) memorizes fuel injector ID code
information. If the ECM detects fuel injector ID codes
are not programmed into the ECM or an error in the
programmed fuel injector ID codes, this DTC will set.

Condition for Running the DTC

• The ignition switch is ON.

Condition for Setting the DTC

Either of following condition is met:

• The ECM detects that the fuel injector ID code is

not programmed.

• The ECM detects an error in the programmed fuel

injector ID code.

Action Taken When the DTC Sets

• The ECM illuminates the SVS lamp when the

diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (Euro 4 Specification)

• The ECM illuminates the MIL when the diagnostic

runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
(Except Euro 4 Specification)

• The ECM limits fuel injection quantity.

• The ECM inhibits cruise control.

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the SVS Lamp/ DTC - Type C. (Euro 4
Specification)

• Refer to DTC Type Definitions for Condition for

Clearing the MIL/ DTC - Type A. (Except Euro 4
Specification)

Notice:

• Clear the DTC with a scan tool after programming

the fuel injector ID code.

Circuit/ System Testing DTC P0602

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check -
Engine Controls?

—

Go to Step 2

Go to Diagnostic

System Check -
Engine Controls

Ensure that all tool connections are secure.

Ensure that programming equipment is
operating correctly.

Install a scan tool.

Turn OFF the ignition for 30 seconds.

Turn ON the ignition, with the engine OFF.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Step 5

Verify the correct fuel injector ID codes are
entered into the ECM with a scan tool. Refer
to ECM Replacement. If the fuel injector ID
codes are correctly entered, clear the DTC
with a scan tool.

Turn OFF the ignition for 30 seconds.

Turn ON the ignition, with the engine OFF.

Does the DTC fail this ignition?

—

Go to Step 4

Go to Step 5

Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.

Did you complete the replacement?

—

Go to Step 5

—

6E-196 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Clear the DTCs with a scan tool.

Turn OFF the ignition for 30 seconds.

Start the engine.

Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.

Did the DTC fail this ignition?

—

Go to Step 3

Go to Step 6

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-197

DTC P0604 or P0606 (Flash Code 153 or 51)

Circuit Description

This diagnostic applies to internal microprocessor
integrity conditions within the ECM.

Condition for Setting the DTC

• The ECM detects a malfunction in its internal

random access memory (RAM). (DTC P0604)

• The ECM detects a malfunction in its internal main

central processing unit (CPU) or sub integrated
circuit (IC). (DTC P0606)

Action Taken When the DTC Sets

• The ECM illuminates the SVS lamp when the

diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (Euro 4 Specification)

• The ECM illuminates the MIL when the diagnostic

runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
(Except Euro 4 Specification)

• The ECM limits fuel injection quantity. (DTC

P0604)

• The ECM inhibits pilot injection. (DTC P0604)

• The ECM inhibits cruise control. (DTC P0604)

• The ECM stops engine running when the vehicle

speed is lower than 5 km/h (3 MPH) for 5 seconds.
The engine will run after the key is cycled when the
ignition has been tuned OFF for longer than 10
seconds. (DTC P0604)

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the SVS Lamp/ DTC - Type C. (Euro 4
Specification)

• Refer to DTC Type Definitions for Condition for

Clearing the MIL/ DTC - Type A. (Except Euro 4
Specification)

Circuit/ System Testing DTC P0604 or P0606

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check -
Engine Controls?

—

Go to Step 2

Go to Diagnostic

System Check -
Engine Controls

Install a scan tool.

Turn OFF the ignition for 30 seconds.

Turn ON the ignition, with the engine OFF.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Step 4

Important: Replacement ECM must be
programmed and learned.
Replace the ECM. Refer to ECM Replacement.

Did you complete the replacement?

—

Go to Step 4

—

Clear the DTCs with a scan tool.

Turn OFF the ignition for 30 seconds.

Start the engine.

Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.

Did the DTC fail this ignition?

—

Go to Step 3

Go to Step 5

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

6E-198 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

DTC P0615 (Flash Code 19)

Circuit Description

The ECM controls the starter cut relay, which de-
energizes the starter relay based on engine speed
inputs or immobilizer command signal. The starter cut
relay uses normally close type relay. During engine
stopping, the starter cut relay is closed to allow
grounding the starter relay. Once engine run, the ECM
energizes the starter cut relay to open the starter relay
circuit and starter motor is disengaged even the ignition
is positioned at START. If the ECM detects an improper
voltage on the starter cut relay control circuit, this DTC
will set.

Condition for Running the DTC

• The ignition switch is ON.

Condition for Setting the DTC

Either of following condition is met:

• The ECM detects a short to ground circuit

condition on the starter cut relay control circuit for
longer than 3 seconds when the relay is
commanded OFF.

• The ECM detects a short to voltage circuit

condition on the starter cut relay control circuit for
longer than 3 seconds when the relay is
commanded ON.

Action Taken When the DTC Sets

• The ECM illuminates the SVS lamp when the

diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C.

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the SVS Lamp/ DTC - Type C.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• If the starter cut relay control circuit is short to

ground, engine does not crank.

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views

Circuit/ System Testing DTC P0615

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check -
Engine Controls?

—

Go to Step 2

Go to Diagnostic

System Check -
Engine Controls

Install a scan tool.

Turn OFF the ignition for 30 seconds.

Turn ON the ignition, with the engine OFF. DO
NOT start the engine.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 4

Go to Step 3

Start the engine.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 6

Go to Diagnostic

Aids

Turn OFF the ignition.

Replace the starter cut relay with the head
light dimmer relay or replace with a known
good relay.

Turn ON the ignition, with the engine OFF. DO
NOT start the engine.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 5

Go to Step 7

Content .. 451 452 453 454 ..