Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 28

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

6E–107

8

Using the DVM and check the MAF sensor power
supply circuit.

1. Ignition “Off”, engine “Off”. 

2. Disconnect the MAF & IAT sensor connector and

ECM connector. 

3. Check the circuit for short to MAF sensor heater

circuit. 

Was the DVM indicated specified value?

No continuity

Go to Step 10

Go to Step 9

9

Repair the circuit for short to MAF sensor heater
circuit. 
Is the action complete?

—

Verify repair

—

10

Repair the short to battery voltage circuit between the
ECM and MAF sensor. 
Was the problem solved?

—

Verify repair

Go to Step 13

11

Substitute a known good MAF & IAT sensor assembly
and recheck. 
Was the problem solved?

—

Go to Step 12

Go to Step 13

12

Replace the MAF & IAT sensor assembly. 
Is the action complete?

—

Verify repair

—

13

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

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

No

4

2

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83

4

C-51

C-57(B)

6E–108

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

Diagnostic Trouble Code (DTC) P0100 (Symptom Code 9) (Flash Code 65) 

Mass Air Flow (MAF) Sensor Voltage Supply Circuit Low Input

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 P0100 (Symptom Code 9) 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 P0100 (Symptom Code 9) stored in this
ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids 

and Go to Step 

4

4

Check for poor/faulty connection at the MAF sensor or
ECM connector. If a poor/faulty connection is found,
repair as necessary. 
Was the problem found?

—

Verify repair

Go to Step 5

5

Visually check the MAF sensor. 
Was the problem found? 

—

Go to Step 10

Go to Step 6

6

Using the DVM and check the MAF sensor power
supply circuit.

1. Ignition “On”, engine “Off”. 

2. Disconnect the MAF & IAT sensor connector. 

3. Check the circuit for short to ground circuit. 

Was the DVM indicated specified value?

Approximately 

5.0V

Go to Step 10

Go to Step 7

92

88

83

2 3

4

5

C-51

C-57(B)

V

4

C-51

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

6E–109

7

Using the DVM and check the MAF sensor power
supply circuit.

1. Ignition “Off”, engine “Off”. 

2. Disconnect the MAF & IAT sensor connector and

ECM connector. 

3. Check the circuit for short to MAF sensor ground

circuit. 

Was the DVM indicated specified value?

No continuity

Go to Step 9

Go to Step 8

8

Repair the circuit for short to MAF sensor ground.
Is the action complete?

—

Verify repair

—

9

Repair the short to ground circuit between the ECM
and MAF sensor. 
Was the problem solved?

—

Verify repair

Go to Step 12

10

Substitute a known good MAF & IAT sensor assembly
and recheck. 
Was the problem solved?

—

Go to Step 11

Go to Step 12

11

Replace the MAF & IAT sensor assembly. 
Is the action complete?

—

Verify repair

—

12

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 13

13

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

4

3

C-51

83

4

C-51

C-57(B)

6E–110

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

Diagnostic Trouble Code (DTC) P0100 (Symptom Code B) (Flash Code 65) 

Mass Air Flow (MAF) Sensor Output Circuit Low Input

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 P0100 (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 P0100 (Symptom Code B) stored in this
ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids 

and Go to Step 

4

4

Check for poor/faulty connection at the MAF sensor or
ECM connector. If a poor/faulty connection is found,
repair as necessary. 
Was the problem found?

—

Verify repair

Go to Step 5

5

Visually check the MAF sensor. 
Was the problem found? 

—

Go to Step 11

Go to Step 6

92

88

83

2 3

4

5

C-51

C-57(B)