Isuzu KB P190. Service manual - part 469

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-259

Repair the open circuit or high resistance on the
ignition voltage feed circuit between the Meter
(10A) fuse and the IP cluster (pin 8 of B-24).

Did you complete the repair?

—

Go to Step 17

—

Repair or replace the IP cluster.

Did you complete the repair or replacement?

—

Go to Step 17

—

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

Did you complete the replacement?

—

Go to Step 17

—

Reconnect all previously disconnected fuse or
harness connector(s).

Clear the DTCs with a scan tool.

Turn OFF the ignition for 30 seconds.

Perform the SVS Lamp Control with a scan
tool.

Command the lamp ON and OFF.

Does the SVS lamp turn ON and OFF with each
command?

—

Go to Step 18

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

6E-260 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

DTC P2100, P2101 or P2103 (Flash Code 446)

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
open circuit or short circuit on the solenoid circuits,
DTC P2100, P2101 or P2103 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 open circuit on the intake

throttle solenoid circuits. (DTC P2100)

• The ECM detects a short to ground on the intake

throttle solenoid circuits. (DTC P2101)

• The ECM detects a short to voltage circuit on the

intake throttle solenoid circuits. (DTC P2103)

Action Taken When the DTC Sets

• The ECM illuminates the MIL on the second

consecutive driving cycle when the diagnostic runs
and fails. Refer to DTC Type Definitions for Action
Taken When the DTC Sets - Type B. (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 inhibits EGR control.

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the MIL/ DTC - Type B (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: Engine Controls Schematics

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

Circuit/ System Testing DTC P2100, P2101 or P2103

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.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Diagnostic

Aids

Turn OFF the ignition.

Disconnect the intake throttle valve harness
connector.

Turn ON the ignition, with the engine OFF.

Connect a DMM between the drive voltage
circuit (pin 2 of E-38) and a known good
ground.

Connect a DMM between the low side circuit
(pin 1 of E-38) and a known good ground.

Are both voltage readings within the specified
value?

1.4 to 1.8 volts

Go to Step 5

Go to Step 4

Is the DMM voltage more than the specified value
at Step 3?

—

Go to Step 7

Go to Step 6

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-261

Test the circuits between the ECM (pins 55
and 56 of E-90) and the intake throttle valve
(pins 1 and 2 of E-38) for a short circuit each
other.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 12

Go to Step 8

Test the circuits (which ever voltage reading
did not read within the specified value at Step
3) between the ECM (pins 55 and 56 of E-90)
and the intake throttle valve (pins 1 and 2 of E-
38) for the following conditions:

• An open circuit

• A short to ground

• A short to the position sensor low

reference circuit

• High resistance

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 12

Go to Step 9

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 12

Go to Step 11

Inspect for an intermittent and for poor
connections at the harness connector of the
intake throttle valve (pins 1 and 2 of E-38).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 12

Go to Step 10

Turn OFF the ignition.

Disconnect the ECM harness connector.

Inspect for an intermittent and for poor
connections at the harness connector of the
ECM (pins 55 and 56 of E-90).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 12

Go to Step 11

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

Did you complete the replacement?

—

Go to Step 10

—

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

Did you complete the replacement?

—

Go to Step 12

—

Step

Action

Value(s)

Yes

6E-262 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

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 3

Go to Step 13

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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