Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 60

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

6E–235

8

Using the DVM and check the clutch switch circuit. 
Breaker box is available: 

1. Ignition “Off”, engine “Off”. 

2. Install the breaker box as type B. (ECM

connected) Ref. Page 6E-81 

3. Ignition “On”, engine “Off”. 

4. Check the circuit for open or short to voltage

circuit. 

Was the DVM indicated specified value?

Breaker box is not available: 

1. Ignition “On”, engine “Off”. 

2. Back probe the DVM to the clutch switch and

check the circuit for open or short to voltage
circuit. 

Was the problem found?

Pedal is not 

stepped on: 

Battery 
voltage

Pedal stepped 

on: Less than 

1V Go 

to 

Step 11

Fixed at battery 

voltage: Go to 

Step 9

Fixed at less 

than 1V: Go to 

Step 10

9

Repair the short to voltage circuit between the clutch
switch connector and ECM. 
Is the action complete?

—

Verify repair

—

10

Repair the open circuit between the clutch switch
connector and ECM. 
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

No

31

V

V

2

C-53

31

2

C-56

C-53

31

2

C-56

C-53

6E–236

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

11

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 12

12

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

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

6E–237

DIAGNOSTIC TROUBLE CODE (DTC) P1105 (SYMPTOM CODE 1) 

(FLASH CODE 86) BAROMETRIC PRESSURE SENSOR CIRCUIT HIGH INPUT

DIAGNOSTIC TROUBLE CODE (DTC) P1105 (SYMPTOM CODE 2) 

(FLASH CODE 86) BAROMETRIC PRESSURE SENSOR CIRCUIT LOW INPUT

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

Circuit Description

The ECM monitors the barometric pressure signal at
inside of the ECM. If the sensor with malfunction, DTC
P1105 (Symptom Code 1) or P1105 (Symptom Code 2)
will be stored.

Diagnostic Aids

If the DTC P1105 is stored, sensor or circuit of ECM
inside is failed.

Diagnostic Trouble Code (DTC) P1105 (Symptom Code 1) (Flash Code 86) 

Barometric Pressure Sensor Circuit High Input

Diagnostic Trouble Code (DTC) P1105 (Symptom Code 2) (Flash Code 86) 

Barometric Pressure Sensor Circuit Low Input

Flash 

Code

Code

Symptom 

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

86

P1105

1

ON

Barometric Pressure Sensor 
Circuit High Input

Barometric pressure sensor 
output voltage is more than 
4.4V.

ECM uses 1013hpa condition 
as substitute.

2

ON

Barometric Pressure Sensor 
Circuit Low Input

Barometric pressure sensor 
output voltage is below 1.5V.

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 P1105 (Symptom Code 1) or P1105
(Symptom Code 2) 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 P1105 (Symptom Code 1) or P1105
(Symptom Code 2) stored in this ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids

4

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

6E–238

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

5

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