Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 40

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

6E–155

Diagnostic Trouble Code (DTC) P0251 (Symptom Code B) (Flash Code 53) 

Injection Pump Malfunction

Step

Action

Value(s)

Yes

No

1

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

—

Go to Step 2

Go to On Board 

Diagnostic 

(OBD) System 

Check

2

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 P0251 (Symptom Code B) stored as
“Present Failure”?

—

Go to Step 3

Refer to 

Diagnostic Aids 

and Go to Step 

3

3

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 P0251 (Symptom Code B) stored in this
ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids

4

Replace the injection pump assembly. 
Is the action complete?

—

Verify repair

—

6E–156

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

Diagnostic Trouble Code (DTC) P0251 (Symptom Code D) (Flash Code 53) 

Injection Pump Malfunction

Step

Action

Value(s)

Yes

No

1

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

—

Go to Step 2

Go to On Board 

Diagnostic 

(OBD) System 

Check

2

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 P0251 (Symptom Code D) stored as
“Present Failure”?

—

Go to Step 3

Refer to 

Diagnostic Aids 

and Go to Step 

3

3

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 P0251 (Symptom Code D) stored in this
ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids

4

Replace the injection pump assembly. 
Is the action complete?

—

Verify repair

—

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

6E–157

Diagnostic Trouble Code (DTC) P0251 (Symptom Code E) (Flash Code 53) 

Injection Pump Malfunction

Step

Action

Value(s)

Yes

No

1

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

—

Go to Step 2

Go to On Board 

Diagnostic 

(OBD) System 

Check

2

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 P0251 (Symptom Code E) stored as
“Present Failure”?

—

Go to Step 3

Refer to 

Diagnostic Aids 

and Go to Step 

3

3

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 P0251 (Symptom Code E) stored in this
ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids

4

Was the DTC P1650 (Symptom Code A) or P1651
(Symptom Code B) stored at the same time?

—

Go to DTC 

Chart P1650 

(Symptom 

Code A) 

Go to Step 5

5

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 6

6

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 7

Go to Step 8

7

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

—

8

Replace the injection pump assembly. 
Is the action complete?

—

Verify repair

—

6E–158

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

DIAGNOSTIC TROUBLE CODE (DTC) P0335 (SYMPTOM CODE B) 

(FLASH CODE 43)CRANKSHAFT POSITION SENSOR CIRCUIT MALFUNCTION

DIAGNOSTIC TROUBLE CODE (DTC) P0335 (SYMPTOM CODE D) 

(FLASH CODE 43) CRANKSHAFT POSITION SENSOR MALFUNCTION

DIAGNOSTIC TROUBLE CODE (DTC) P0335 (SYMPTOM CODE E) 

(FLASH CODE 43) ENGINE SPEED INPUT CIRCUIT RANGE/PERFORMANCE

0.5
BLK

0.5
GRN/
BLK

69

0.5
RED/
GRN

49

0.5
GRN/
ORG

38

0.5
BLK/
GRN

57

2.0
BLK

1

2.0
BLK

2

0.5
BLK/
PNK

93

0.5
GRY

ECT

Sensor

TPS &

Idle SW

89

0.5
WHT

98

101

0.5
GRN/
RED

CKP

Sensor

90

IC

IC

IC

IC

Engine
Control
Module
(ECM)