Isuzu KB P190. Manual - part 457

ENGINE CONTROL SYSTEM (4JK1/4JJ1)   6E-211

Circuit/ System Testing DTC P0653

11

Replace the FRP sensor. Refer to FRP Sensor
Replacement.

Did you complete the replacement?

—

Go to Step 15

—

12

Replace the CMP sensor. Refer to CMP Sensor
Replacement.

Did you complete the replacement?

—

Go to Step 15

—

13

Replace the APP sensor. Refer to APP Sensor
Replacement.

Did you complete the replacement?

—

Go to Step 15

—

14

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

Did you complete the replacement?

—

Go to Step 15

—

15

1.

Reconnect all previously disconnected
harness connector(s).

2.

Clear the DTCs with a scan tool.

3.

Turn OFF the ignition for 30 seconds.

4.

Start the engine.

5.

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 16

16

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

No

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Engine Controls?

—

Go to Step 2

Go to Diagnostic 

System Check - 
Engine Controls

2

1.

Install a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Start the engine.

4.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Diagnostic 

Aids

6E-212   ENGINE CONTROL SYSTEM (4JK1/4JJ1)

3

1.

Test the 5 volts reference circuit between the
ECM and the following components for a short
to battery or ignition voltage:

• ECM (pin 19 of E-90) and BARO sensor

(pin 3 of E-40)

• ECM (pin 31 of E-90) and EGR position

sensor (pin 1 of E-71)

• ECM (pin 47 of E-90) and FRP sensor

(pin 3 of E-48)

• ECM (pin 46 of E-90) and CMP sensor

(pin 3 of E-39)

• ECM (pin 9 of C-58) and APP sensor 2

(pin 8 of C-40)

2.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 5

Go to Step 4

4

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

Did you complete the replacement?

—

Go to Step 5

—

5

1.

Reconnect all previously disconnected
harness connector(s).

2.

Clear the DTCs with a scan tool.

3.

Turn OFF the ignition for 30 seconds.

4.

Start the engine.

5.

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

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

No

ENGINE CONTROL SYSTEM (4JK1/4JJ1)   6E-213

DTC P0661 or P0662 (Flash Code 58)

Circuit Description

The ECM controls the swirl levels, which energize the
swirl control solenoid valve based on the engine
running condition. The ECM commands the swirl
control solenoid valve to apply vacuum pressure to the
diaphragm actuator to operate swirl control butterflies
that is provided each intake port. If the ECM detects an
open circuit or short circuit on the solenoid valve circuit,
DTC P0661 or P0662 will set.

Condition for Running the DTC

• The battery voltage is more than 9 volts.

• The ignition switch is ON.

Condition for Setting the DTC

• The ECM detects a low voltage condition on the

swirl control solenoid valve circuit when the
solenoid is commanded OFF. (DTC P0661)

• The ECM detects a high voltage condition on the

swirl control solenoid valve circuit when the
solenoid is commanded ON. (DTC P0662)

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

P0661)

• The ECM inhibits cruise control. (DTC P0661)

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)

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Schematic Reference: Vacuum Hose Routing
Diagram and Engine Controls Schematics

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

Circuit/ System Testing DTC P0661

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check -
Engine Controls?

—

Go to Step 2

Go to Diagnostic 

System Check - 
Engine Controls

2

1.

Install a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Turn ON the ignition, with the engine OFF.

4.

Monitor the DTC Information with a scan tool.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Diagnostic 

Aids

3

1.

Turn OFF the ignition.

2.

Disconnect the swirl control solenoid valve
harness connector.

3.

Connect a test lamp between the ignition
voltage feed circuit (pin 2 of E-67) and a
known good ground.

4.

Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

—

Go to Step 4

Go to Step 6

6E-214   ENGINE CONTROL SYSTEM (4JK1/4JJ1)

4

1.

Connect a test lamp between the control
circuit (pin 1 of E-67) and battery voltage.

2.

Perform the Swirl Control Solenoid Test with a
scan tool.

3.

Command the solenoid valve ON and OFF.

Does the test lamp turn ON and OFF with each
command (if test is aborted, go to Step 5)?

—

Go to Step 9

Go to Step 5

5

Does the test lamp remain illuminated with each
command?

—

Go to Step 8

Go to Step 7

6

Repair the open circuit or high resistance between
the Engine (10A) fuse and the solenoid valve (pin 2
of E-67). Check the Engine (10A) fuse first.

Did you complete the repair?

—

Go to Step 13

—

7

1.

Test the control circuit between the ECM (pin
67 of E-90) and the solenoid valve (pin 1 of E-
67) for an open circuit or high resistance.

2.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 13

Go to Step 10

8

1.

Test the control circuit between the ECM (pin
67 of E-90) and the solenoid valve (pin 1 of E-
67) for a short to ground.

2.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 13

Go to Step 12

9

1.

Inspect for an intermittent and for poor
connections at the harness connector of the
solenoid valve (pins 1 and 2 of E-67).

2.

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 13

Go to Step 11

10

1.

Turn OFF the ignition.

2.

Disconnect the ECM harness connector.

3.

Inspect for an intermittent and for a poor
connection at harness connector of the ECM
(pin 67 of E-90).

4.

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 13

Go to Step 12

11

Replace the swirl control solenoid valve.

Did you complete the replacement?

—

Go to Step 13

—

12

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

Did you complete the replacement?

—

Go to Step 13

—

Step

Action

Value(s)

Yes

No