Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 214

 

  Index      Ford     Isuzu D-Max / Isuzu Rodeo TFR/TFS series - service repair manual 1997-2003 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  212  213  214  215   ..

 

 

Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 214

 

 

ENGINE DRIVEABILITY AND EMISSIONS

6E–97

6

Using the DVM and check the fuel pump relay power
supply circuit. 

1. Ignition “On”, engine “Off”. 

2. Remove the fuel pump relay from the relay box. 

3. Check the circuit for open or short to ground

circuit. 

Was the DVM indicated specified value?

Battery 
voltage

Go to Step 8

Go to Step 7

7

Repair the open or short to ground circuit between the
“ECM” fuse (15A) and fuel pump relay. 
Is the action complete?

—

Verify repair

—

8

Using the DVM and check the fuel pump relay ground
circuit. 

1. Ignition “Off”, engine “Off”. 

2. Disconnect the ECM connector. 

3. Remove the fuel pump relay from the relay box. 

4. Check the circuit for open or short to ground

circuit. 

Was the problem found?

—

Repair faulty 
harness and 

verify repair

Go to Step 9

9

Using the DVM and check the fuel pump relay power
supply circuit. 

1. Ignition “Off”, engine “Off”. 

2. Remove the fuel pump relay from the relay box. 

3. Check the circuit for open circuit. 

Was the DVM indicated specified value?

Battery 
voltage

Go to Step 11

Go to Step 10

Step

Action

Value(s)

Yes

No

V

3

X2

4

11

C56(J2)

X2

V

1

X2

6E–98

ENGINE DRIVEABILITY AND EMISSIONS

10

Repair the open circuit between the fuel pump relay
and battery. 
Is the action complete?

—

Verify repair

—

11

Using the DVM and check the fuel pump power supply
circuit. 

1. Ignition “On”, engine “Off”. 

2. Disconnect the fuel pump connector. 

3. Check the circuit for open or short to ground

circuit. 

Was the DVM indicated specified value?

Battery 
voltage

Go to Step 13

Go to Step 12

12

Repair the open or short to ground circuit between the
fuel pump relay and fuel pump. 
Is the action complete?

—

Verify repair

—

13

Using the DVM and check the fuel pump ground
circuit. 

1. Ignition “Off”, engine “Off”. 

2. Disconnect the fuel pump connector. 

3. Check the circuit for open circuit. 

Was the DVM indicated specified value?

Continuity

Go to Step 15

Go to Step 14

14

Repair the open circuit between the fuel pump and
body ground. 
Is the action complete?

—

Verify repair

—

15

Replace the fuel pump. 
Was the problem solved?

—

Verify repair

Go to Step 16

16

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 17

Step

Action

Value(s)

Yes

No

V

1

F2

V

4

F2

ENGINE DRIVEABILITY AND EMISSIONS

6E–99

17

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

No

6E–100

ENGINE DRIVEABILITY AND EMISSIONS

FUEL SYSTEM DIAGNOSIS

Circuit Description

When the ignition switch is turned ON, the engine
control module (ECM) will turn ON the in-tank fuel
pump. The in-tank fuel pump will remain ON as long as
the engine is cranking or running and the ECM is
receiving 58X crankshaft position pulses. If there are no
58X crankshaft position pulses, the ECM will turn the in-
tank fuel pump OFF 2 seconds after the ignition switch
is turned ON or 2 seconds after the engine stops
running.
The in-tank fuel pump is an electric pump within an
integral reservoir. The in-tank fuel pump supplies fuel
through an in-line fuel filter to the fuel rail assembly. The
fuel pump is designed to provide fuel at a pressure
above the pressure needed by the fuel injectors. A fuel
pressure regulator, attached to the fuel rail, keeps the
fuel available to the fuel injectors at a regulated
pressure. Unused fuel is returned to the fuel tank by a
separate fuel return line.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2.  Connect the fuel pressure gauge to the fuel feed line

as shown in the fuel system illustration. Wrap a shop
towel around the fuel pressure connection in order to
absorb any duel leakage that may occur when
installing the fuel pressure gauge. With the ignition
switch ON and the fuel pump running, the fuel
pressure indicated by the fuel pressure gauge
should be 283-376 kPa (41-55 psi). This pressure is
controlled by the amount of pressure the spring
inside the fuel pressure regulator can provide.

3.  A fuel system that cannot maintain a constant fuel

pressure has a leak in one or more of the following
areas:

• The fuel pump check valve.

• The fuel pump flex line.

• The valve or valve seat within the fuel pressure

regulator.

µP

V

Ign

-

+

Crankshaft
Position
Sensor

J1-1 J1-2 J1-17

Battery
Voltage

Battery
Voltage

2.0
WHT

ECM
10A

450
mV

A/D Converter

Vcc
+5V

-

+

TIMING
COVER

J2-6

J2-21

Fuel
Pump

FUEL
PUMP
20A

2.0
BLK

2.0
BLK/
BLU

Fuel
Pump
Relay

O

2

SENSOR
10A

Heated
O

2

Sensor

0.85
RED/
WHT

0.5
GRN/
WHT

0.5
RED/
WHT

0.5
BLU/
WHT

0.5
BLU

0.5 PNK

J2-31

J2-11

J2-2

J2-18

M

Engine
Control
Module
(ECM)

 

 

 

 

 

 

 

Content   ..  212  213  214  215   ..