Isuzu KB P190. Manual - part 463

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-235

Turn OFF the ignition.

Disconnect the FRP regulator harness
connector.

Inspect for an intermittent, for poor
connections and corrosion at the harness
connector of the FRP regulator (pins 1 and 2
of E-50).

Disconnect the ECM harness connector.

Inspect for an intermittent, for poor
connections and corrosion at the harness
connector of the ECM (pins 34, 50, 54 and 70
of E-90).

Test for high resistance on each FRP regulator
circuit.

Repair the connection(s) or circuit(s) as
necessary.

Did you find and correct the condition?

—

Go to Step 19

Go to Step 17

Turn OFF the ignition.

Disconnect the FRP sensor harness
connector.

Inspect for an intermittent, for poor
connections and corrosion at the harness
connector of the FRP sensor (pins 1, 2 and 3
of E-48).

Disconnect the ECM harness connector.

Inspect for an intermittent, for poor
connections and corrosion at the harness
connector of the ECM (pins 47, 48, 68 and 69
of E-90).

Test for high resistance on each circuit.

Repair the connection(s) or circuit(s) as
necessary.

Did you find and correct the condition?

—

Go to Step 19

Go to Step 14

Replace the FRP sensor. Refer to FRP sensor
Replacement.

Did you complete the replacement?

—

Go to Step 19

—

Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that was
leaking fuel found at Step 3 and inspect the engine
mechanical for any damage or poor engine
compression. Refer to Fuel Injector Replacement/
Fuel Injector ID Code Data Programming and
engine mechanical section.

Did you complete the replacement?

—

Go to Step 19

—

Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that does not
change engine speed when commanded OFF.
Refer to Fuel Injector Replacement/ Fuel Injector
ID Code Data Programming.

Did you complete the replacement?

—

Go to Step 19

—

Step

Action

Value(s)

Yes

6E-236 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Important: The fuel supply pump must be timed to
the engine and adjustment value must be learned
to the ECM.
Notice: Always replace the fuel filter cartridge
when a fuel supply pump is replaced.
Replace the fuel supply pump and fuel filter
cartridge. Refer to Fuel Supply Pump Replacement
and Fuel Filter Cartridge Replacement.

Did you complete the replacement?

—

Go to Step 19

—

Notice: There is a possibility that the pressure
limiter valve stuck open or opening pressure has
fallen.
Replace the pressure limiter valve. Refer to Fuel
Rail Replacement.

Did you complete the replacement?

—

Go to Step 19

—

Reconnect all previously disconnected
harness connector(s).

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 2

Go to Step 20

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-237

DTC P1196, P1197 or P1198 (Flash Code 461)

Circuit Description

The ECM controls the intake throttle valve opening
based on the engine running condition and by
controlling the intake throttle solenoid. The intake
throttle valve position is detected by the position
sensor, and relayed to the ECM. If the ECM detects an
excessively high temperature condition in its internal
intake throttle solenoid drive circuit for certain length of
time, DTC P1196, P1197 or P1198 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 an excessively high temperature

in its internal intake throttle solenoid drive circuit
for longer than 30 seconds. (DTC P1196)

• The ECM detects an excessively high temperature

in its internal intake throttle solenoid drive circuit
for longer than 60 seconds in accumulation time
during same ignition cycle. (DTC P1197)

• The ECM detects an excessively high temperature

in its internal intake throttle solenoid drive circuit
for longer than 120 seconds in accumulation time
exceeding ignition cycle. (DTC P1198)

Action Taken When the DTC Sets

• 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.

• The ECM limits fuel injection quantity.

• The ECM inhibits pilot injection.

• The ECM inhibits cruise control.

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the MIL/ DTC - Type A.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

• A sticking or intermittently sticking intake throttle

valve may set this DTC.

Circuit/ System Testing DTC P1196, P1197 or P1198

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.

Start the engine.

Monitor the DTC Information with a scan tool.

Is DTC P0638 also set?

—

Go to DTC P0638

Go to Step 3

Perform the Intake Throttle Solenoid Control
with a scan tool several times.

Command the Desired Intake Throttle Position
Increase and Decrease while observing the
Intake Throttle Position.

Does the Intake Throttle Position parameter follow
within the specified value quick enough (compare
with a similar unit if available)?

± 5%

Go to Diagnostic

Aids

Go to Step 4

6E-238 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Remove the intake duct that is connected to
the intake throttle valve.

Inspect the intake throttle valve for the
following conditions:

• Restricted intake throttle valve by foreign

materials

• Excessive deposits at throttle bore

• Bent butterfly valve

Notice: Replace the intake throttle valve if there is
any sticking.

Repair or replace as necessary.

Did you find and correct the condition?

—

Go to Step 6

Go to Step 5

Replace the intake throttle valve. Refer to Intake
Throttle Valve Replacement.

Did you complete the replacement?

—

Go to Step 6

—

Reconnect all previously disconnected
harness connector(s).

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 7

Go to Step 9

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

Did you complete the replacement?

—

Go to Step 8

—

Reconnect all previously disconnected
harness connector(s).

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 2

Go to Step 9

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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