Isuzu KB P190. Manual - part 450

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-183

DTC P0565 (Flash Code 515)

Circuit Description

The cruise control keeps the vehicle speed at a driver's
set speed. When the cruise main switch is turned ON,
signal is provided to the ECM and the cruise main
indicator lamp on the switch or the instrument panel
cluster will light up. If the ECM detects the cruise main
switch signal repeats ON/ OFF or continuously ON, this
DTC will set.

Condition for Running the DTC

• The ignition switch is ON.

• The engine is running.

Condition for Setting the DTC

Either of following condition is met:

• The ECM detects that the cruise main switch

signal is repeated ON/ OFF continuously within a
very short calibrated time.

• The ECM detects that the cruise main switch

signal is stuck at the ON position (high voltage) for
longer than 15 seconds.

Action Taken When the DTC Sets

• The ECM will not illuminate the MIL or SVS lamp.

Refer to DTC Type Definitions for Action Taken
When the DTC Sets - Type D.

• The ECM inhibits cruise control.

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the DTC - Type D.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• This DTC will set if the cruise main switch

continues being pushed for longer than 15
seconds.

Schematic Reference: Engine Controls Schematics

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

Circuit/ System Testing DTC P0565

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 ON the ignition, with the engine OFF.

Observe the Cruise Main Switch parameter
with a scan tool.

Does the scan tool indicate ON when the switch is
pushed and OFF when the switch is released?

—

Go to Diagnostic

Aids

Go to Step 3

Turn OFF the ignition.

Disconnect the cruise main switch harness
connector. (Remove the switch from the IP
bezel as necessary)

Turn ON the ignition, with the engine OFF.

Does the Cruise Main Switch indicate OFF?

—

Go to Step 5

Go to Step 4

Test the signal circuit between the ECM (pin
14 of C-58) and the cruise main switch (pin 3
of B-67) for a short to battery or ignition
voltage.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 7

Go to Step 6

Repair or replace the cruise main switch.

Did you complete the repair or replacement?

—

Go to Step 7

—

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

Did you complete the replacement?

—

Go to Step 7

—

6E-184 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Reconnect all previously disconnected
harness connector(s).

Clear the DTCs with a scan tool.

Turn ON the ignition, with the engine OFF.

Observe the Cruise Main Switch parameter
with a scan tool.

Dose the scan tool indicate ON when the switch is
pushed and OFF when the switch is released?

—

Go to Step 8

Go to Step 3

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-185

DTC P0566 (Flash Code 516)

Circuit Description

The cruise control keeps the vehicle speed at a driver's
set speed. When the cruise main switch is turned ON,
signal is provided to the ECM and the cruise main
indicator lamp on the switch or the instrument panel
cluster will light up. The cruise cancel switch is a
normally closed type switch. When the cruise cancel
switch is applied, the switch signal to the ECM is
stopped (low voltage) and the cruise control system is
inactive. If the ECM detects the cruise cancel switch
signal repeats ON/ OFF or continuously OFF this DTC
will set.

Condition for Running the DTC

• The ignition switch is ON.

• The engine is running.

Condition for Setting the DTC

Either of following condition is met:

• The ECM detects that the cruise cancel switch

signal is repeated ON/ OFF continuously within a
very short calibrated time.

• The ECM detects that the cruise cancel switch

signal is stuck at the OFF position (low voltage) for
longer than 40 seconds.

Action Taken When the DTC Sets

• The ECM will not illuminate the MIL or SVS lamp.

Refer to DTC Type Definitions for Action Taken
When the DTC Sets - Type D.

• The ECM inhibits cruise control.

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the DTC - Type D.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• This DTC will set if the cruise cancel switch

continues being applied for longer than 40
seconds.

Schematic Reference: Engine Controls Schematics

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

Circuit/ System Testing DTC P0566

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 ON the ignition, with the engine OFF.

Observe the Cruise Cancel Switch parameter
with a scan tool.

Does the scan tool indicate OFF when the switch is
applied and ON when the switch is released?

—

Go to Diagnostic

Aids

Go to Step 3

Turn OFF the ignition.

Disconnect the combination switch harness
connector (B-59). (Remove the IP cluster
lower cover as necessary)

Turn ON the ignition, with the engine OFF.

Connect a test lamp between the ignition
voltage feed circuit of the combination switch
harness (pin 11 of B-59 male side) and a
known good ground.

Does the test lamp illuminate?

—

Go to Step 4

Go to Step 5

6E-186 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Observe the Cruise Cancel Switch parameter with
a scan tool while momentarily jumping 3-amp fused
jumper wire across the combination switch harness
connector (male side) between pins 10 and 11 of B-
59.

Does the scan tool indicate ON when the circuit is
jumpered and OFF when the circuit is not
jumpered?

—

Go to Step 7

Go to Step 6

Repair the open circuit or high resistance between
the Engine (10A) fuse and the combination switch
(pin 11 of B-59). Check Engine (10A) fuse first.

Did you complete the repair?

—

Go to Step 11

—

Test the signal circuit between the ECM (pin
13 of C-58) and the combination switch (pin 11
of B-59) for and open circuit or high
resistance.

Repair the circuit(s) as necessary.

Did your find and correct the condition?

—

Go to Step 11

Go to Step 8

Inspect fro an intermittent and for a poor
connection at the harness connector of the
combination switch (pin 11 of B-59).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 11

Go to Step 9

Turn OFF the ignition.

Disconnect the ECM harness connector.

Inspect for an intermittent and for poor
connections at the harness connector of the
ECM (pin 13 of C-58).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 11

Go to Step 10

Repair or replace the combination switch.

Did you complete the repair or replacement?

—

Go to Step 11

—

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

Did you complete the replacement?

—

Go to Step 11

—

Reconnect all previously disconnected
harness connector(s).

Clear the DTCs with a scan tool.

Turn ON the ignition, with the engine OFF.

Observe the Cruise Cancel Switch parameter
with a scan tool.

Dose the scan tool indicate OFF when the switch is
applied and ON when the switch is released?

—

Go to Step 12

Go to Step 3

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

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