Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 159

6E–240

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 14

Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

—

Verify repair

—

Step

Action

Value(s)

Yes

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–241

Diagnostic Trouble Code (DTC) P1120 (Symptom Code E) (Flash Code 21)

Pedal/Throttle Position Sensor Idle Position Switch Error

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to On Board

Diagnostic

(OBD) System

Check

1. Connect the Tech 2.

2. Review and record the failure information.

3. Select “F0: Read DTC Infor As Stored By ECU” in

“F0: Diagnostic Trouble Codes”.

Is the DTC P1120 (Symptom Code E) stored as
“Present Failure”?

—

Go to Step 3

Refer to

Diagnostic Aids

and Go to Step

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Select “F1: Clear DTC Information” in “F0:

Diagnostic Trouble Codes” with the Tech 2 and
clear the DTC information.

3. Operate the vehicle and monitor the “F0: Read

DTC Infor As Stored By ECU” in the “F0:
Diagnostic Trouble Codes”.

Was the DTC P1120 (Symptom Code E) stored in this
ignition cycle?

—

Go to Step 4

Refer to

Diagnostic Aids

and Go to Step

Visually check the TPS.
Was the problem found?

—

Go to Step 8

Go to Step 5

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Monitor the “Throttle Position” in the data display.

Does the Tech 2 indicate correct “Throttle Position”
from 0% to 100% depending on accelerator pedal
operation?

—

Go to Step 7

Go to Step 6Go

to Step 6

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Monitor the “Throttle Position” in the data display.

3. Adjust the TPS within 0% to 100%.

Was the problem solved?

—

Verify repair

Go to Step 8

1. Using the Tech 2, ignition “On” and engine “Off”.

2. Monitor the “Idle Switch” in the data display.

Does the Tech 2 indicate “Inactive” when the
accelerator pedal was stepped on?

—

Go to Step 10

Go to Step 8

Substitute a known good TPS and recheck.
Was the problem solved?

—

Go to Step 9

Go to Step 10

Replace the TPS.
Is the action complete?

—

Verify repair

—

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

—

Verify repair

Go to Step 11

6E–242

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

—

Verify repair

—

Step

Action

Value(s)

Yes

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–243

DIAGNOSTIC TROUBLE CODE (DTC) P1173 (SYMPTOM CODE 3)

(FLASH CODE 22) FUEL REDUCTION CAUSED BY HIGH COOLANT

TEMPERATURE

DIAGNOSTIC TROUBLE CODE (DTC) P1173 (SYMPTOM CODE 7)

(FLASH CODE 22) FUEL REDUCTION CAUSED BY HIGH FUEL TEMPERATURE

Condition for setting the DTC and action taken when the DTC sets

Circuit Description

The engine coolant temperature (ECT) sensor is
installed on the coolant stream. High coolant
temperature produces a low resistance. The ECM
supplies 5 volts signal to the ECT sensor through
resisters in the ECM and measures the voltage. The
signal voltage will be low when the engine temperature
is hot.
The fuel temperature sensor is assembled inside of the
pump control unit (PSG). The signal of fuel temperature
is sent via the CAN-bus from the PSG to ECM.
If the engine coolant temperature is excessively high
condition, DTC P1173 (Symptom Code 3) will be stored.
If the fuel temperature is excessively high condition,
DTC P1173 (Symptom Code 7) will be stored.

Diagnostic Aids

An intermittent may be caused by the following:

• Poor connections.

• Misrouted harness.

• Rubbed through wire insulation.

• Broken wire inside the insulation.
Check for the following conditions:

• Poor connection at ECM and PSG-Inspect harness

connectors for backed out terminals, improper
mating, broken locks, improperly formed or damaged
terminals, and poor terminal to wire connection.

• Damaged harness-Inspect the wiring harness for

damage. If the harness appears to be OK, observe
the “Coolant Temperature” or “Fuel Temperature”
display on the Tech2 while moving connectors and
wiring harness related to the sensor.

Diagnostic Trouble Code (DTC) P1173 (Symptom Code 3) (Flash Code 22) Fuel

Reduction Caused By High Coolant Temperature

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P1173

OFF

Fuel Reduction Caused By
High Coolant Temperature

Excessive high engine cool-
ant temperature is detected.

No fail-safe function.

OFF

Fuel Reduction Caused By
High Fuel Temperature

Fuel temperature is more than
100Åé.

PSG (pump control unit) con-
trols fuel injection quantity
based on engine speed and
fuel temperature.

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to On Board

Diagnostic

(OBD) System

Check

1. Connect the Tech 2.

2. Review and record the failure information.

3. Select “F0: Read DTC Infor As Stored By ECU” in

“F0: Diagnostic Trouble Codes”.

Is the DTC P1173 (Symptom Code 3) stored as
“Present Failure”?

—

Go to Step 3

Refer to

Diagnostic Aids

and Go to Step

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