Isuzu KB P190. Manual - part 459

ENGINE CONTROL SYSTEM (4JK1/4JJ1)   6E-219

Circuit/ System Testing DTC P0699

13

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 14

14

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

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 7 of C-58) and APP sensor 3

(pin 1 of C-40)

• ECM (pin 20 of E-90) and boost pressure

sensor (pin 3 of E-107)

• ECM (pin 36 of E-90) and intake throttle

position sensor (pin 6 of E-38)

• ECM (pin 37 of E-90) and CKP sensor

(pin 3 of E-52)

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

—

6E-220   ENGINE CONTROL SYSTEM (4JK1/4JJ1)

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-221

DTC P0700 (Flash Code 185)

Circuit Description

The transmission control module (TCM) requests to
illuminate the malfunction indicator lamp (MIL) via a
controller area network (CAN) communication bus to
the ECM when the TCM sets a MIL request DTC(s). If
the ECM detects the MIL illumination request signal,
this DTC will set.

Condition for Running the DTC

• DTCs U0001 and U0101 are not set.

• The ignition switch is ON.

Condition for Setting the DTC

• The ECM detects that the MIL illumination is

requested by the TCM.

Action Taken When the DTC Sets

• The ECM illuminates MIL when the diagnostic runs

and fails. Refer to DTC Type Definitions for Action
Taken When the DTC Sets - Type A.

• 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

• Under normal conditions if the TCM sets a DTC

that requests the MIL to be illuminated, P0700 will
set.

Test Description

The number below refers to the step number on the
Circuit/ System Testing.
2. If the TCM has DTCs set that are requesting MIL
illumination, diagnose that DTC first.
3. If the TCM has DTCs set, clear the DTCs in the TCM
first.

Circuit/ System Testing DTC P0700

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 transmission DTC Information with
a scan tool.

Are there any transmission DTCs set?

—

Go to Applicable 

DTC in Automatic 

Transmission 

Section

Go to Step 3

3

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 2

Go to Step 4

4

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

6E-222   ENGINE CONTROL SYSTEM (4JK1/4JJ1)

DTC P1064 or P1065 (Flash Code 247)

Circuit Description

The fuel rail pressure (FRP) regulator is installed to the
fuel supply pump and controls the suction fuel quantity
into the fuel rail. The FRP regulator is fully opened in
the normal state and larger drive current results in
smaller opening. The ECM calculates desired fuel rail
pressure and fuel flow rate and it compares the
calculated desired fuel rail pressure to the actual value
to determine the FRP regulator position. When the
actual fuel rail pressure is higher than the desired
value, the FRP regulator is closed to decease the flow
rate.
If the ECM detects an over current condition on the
FRP regulator feedback circuit, DTC P1064 will set.
If the ECM detects an improper voltage level on the
FRP regulator control high side circuit, DTC P1065 will
set.

Condition for Running the DTC

• DTC P1064 is not set. (DTC P1065)

• The battery voltage is more than 9 volts.

• The ignition switch is ON.

Condition for Setting the DTC

• The ECM detects an over current condition on the

FRP regulator feedback circuit. (DTC P1064)

• The ECM detects a low or high voltage condition

on the FRP regulator high side circuit. (DTC
P1065)

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.

Schematic Reference: Engine Controls Schematics

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

Circuit/ System Testing DTC P1064

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

Important: The ECM may be damaged if the FRP
regulator low side circuit is shorted to a voltage
source.

1.

Test the low side circuits between the ECM
(pins 50 and 70 of E-90) and the FRP
regulator (pin 2 of E-50) for a short to battery
or ignition voltage.

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

—