Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 45

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–175

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 10

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

6E–176

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0381 (Symptom Code 8) (Flash Code 67)

Glow Plug Indicator Circuit Voltage High

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 P0381 (Symptom Code 8) 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 P0381 (Symptom Code 8) stored in this
ignition cycle?

—

Go to Step 4

Refer to

Diagnostic Aids

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 5

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

—

Go to Step 6

—

Verify repair

—

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–177

DIAGNOSTIC TROUBLE CODE (DTC) P0400 (SYMPTOM CODE 3)

(FLASH CODE 32) EXHAUST GAS RECIRCULATION FLOW EXCESSIVE

DETECTED

DIAGNOSTIC TROUBLE CODE (DTC) P0400 (SYMPTOM CODE 4)

(FLASH CODE 32) EXHAUST GAS RECIRCULATION CIRCUIT SHORT TO

GROUND OR OPEN CIRCUIT

DIAGNOSTIC TROUBLE CODE (DTC) P0400 (SYMPTOM CODE 5)

(FLASH CODE 32) EXHAUST GAS RECIRCULATION FLOW INSUFFICIENT

DETECTED

DIAGNOSTIC TROUBLE CODE (DTC) P0400 (SYMPTOM CODE 8)

(FLASH CODE 32) EXHAUST GAS RECIRCULATION CIRCUIT SHORT TO

BATTERY

Batt

µP

Batt

µP

Batt

µP

0.5
BLK/
URG

0.5
BRN/
RED

0.5
BLU/
RED

4JA1-TC

0.5
GRY/
YEL

0.5
WHT/
RED

0.5
GRN/
RED

0.5
BLK/
RED

0.5
BLK/
BLU

IAT
Sensor

MAF &
IAT
Sensor

Rr Fog
Light
10A

EGR-
EVRV

0.5
WHT/
BLK

0.5
BLU/
RED

0.5
WHT/
BLU

0.5
BLU/
RED

0.5
GRN/
RED

0.5
BLU/
RED

Exhaust
Throttle
VSV2

Exhaust
Throttle
VSV1

Engine
Warming Up
SW

Thermo
SW

Battery
Voltage

ECM
Main Relay

CPU

Engine
Control
Module
(ECM)

6E–178

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

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

Circuit Description

The amount of EGR is controlled by EVRV (electrical
vacuum regulating valve) via the engine control module
(ECM) command signal depends on the engine speed,
operating of the accelerator pedal and engine coolant
temperature.
The EVRV is shaped to control vacuum applied to the
diaphragm chamber of the EGR valve based on duty
signal sent from the ECM.
If the EGR valve is stuck at open position or close
position, DTC P0400 (Symptom Code 3) or DTC P0400
(Symptom Code 5) is stored.
If the EGR EVRV circuit is open or short ground circuit,
DTC P0400 (Symptom Code 4) is stored.
If the EGR EVRV circuit is short to voltage circuit, DTC
P0400 (Symptom Code 8) is stored.

Diagnostic Aids

An intermittent may be caused by the following:

• Poor connections.

• Misrouted harness.

• Rubbed through wire insulation.

• Broken wire inside the insulation.

• EGR valve sticking.

• Faulty intake air duct connection.
Check for the following conditions:

• Poor connection at ECM-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 DTC P0400 display on the Tech2 while moving
connectors and wiring harnesses. A change in the
display will indicate the location of the fault.

Diagnostic Trouble Code (DTC) P0400 (Symptom Code 3) (Flash Code 32)

Exhaust Gas Recirculation Flow Excessive Detected

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P0400

Exhaust Gas Recirculation
Flow Excessive Detected

1. Intake air temperature is

between 15°C and 100°C.

2. Engine coolant temperature

is between 55°C and
100°C.

3. Barometric pressure is

between 850hpa and
1100hpa.

4. Small amount of mass air

flow. (Desired mass air flow
- mass air flow is more than
150mg/strk)

Fuel injection quantity is
reduced.

Exhaust Gas Recirculation
Circuit Short to Ground or
Open Circuit

EGR EVRV circuit open or
short to ground circuit.

Fuel injection quantity is
reduced and EGR EVRV 10%
conditions as substitute.

Exhaust Gas Recirculation
Flow Insufficient Detected

1. Intake air temperature is

between 15°C and 100°C.

2. Engine coolant temperature

is between 55°C and
100°C.

3. Barometric pressure is

between 850hpa and
1100hpa.

4. Large mount of mass air

flow. (Desired mass air
flow - mass air flow is below
150 mg/strk)

Fuel injection quantity is
reduced.

Exhaust Gas Recirculation
Circuit Short to Battery

EGR EVRV circuit short to
voltage circuit.

Fuel injection quantity is
reduced & EGR EVRV 10%
conditions as substitute.

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

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