Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 27

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

6E–103

44

P1650

A

ON

CAN Device Offline

CAN controller detects Bus-off
or canceling.

MAB (fuel cutoff solenoid
valve) is operated.

CAN controller detects correct Bus
signal.

1. CAN high circuit open, short to
ground or short to voltage circuit.
2. CAN low circuit open, short to
ground or short to voltage circuit.
3. Poor connector connection.
4. Electrical interference.
5. ECM malfunction.
6. PSG (pump control unit) mal-
function.

99/100

P1651(B)

B

ON

CAN Device Hang-up

CAN controller does not react
under engine running.

CAN controller reacts correctly
under engine running.

1. ECM malfunction.
2. PSG (pump control unit) mal-
function.

-

-

45

P1651

A

ON

CAN Malfunction (PSG)

The PSG (pump control unit)
does not recognize CAN sig-
nal from the CAN controller.

1. MAB (fuel cutoff solenoid
valve) is operated.
2. Desired injection quantity
becomes 0mg/strk.

The PSG (pump control unit) recog-
nizes CAN signal from the CAN
controller.

1. ECM malfunction.
2. PSG (pump control unit) mal-
function.

-

-

B

ON

CAN Receives Error

The ECM does not read CAN
signal from the PSG (pump
control unit).

The ECM reads CAN signal from
the PSG (pump control unit).

1. CAN high circuit open, short to
ground or short to voltage circuit.
2. CAN low circuit open, short to
ground or short to voltage circuit.
3. Poor connector connection.
4. Electrical interference.
5. ECM malfunction.
6. PSG (pump control unit) mal-
function.

99/100

P1650(A)

77

P1690

4

OFF

Check Engine Lamp (MIL) Circuit
Voltage Low

Check engine lamp circuit
open or short to ground circuit.

No fail-safe function.

Check engine lamp circuit is correct
condition.

1. Check engine lamp circuit
open or short to ground circuit.
2. Check engine lamp malfunc-
tion.
3. ECM malfunction.

42

B****

8

OFF

Check Engine Lamp (MIL) Circuit
Voltage High

Check engine lamp circuit
short to voltage circuit.

ECM malfunction.

-

-

Flash

Code

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

Recovery Condition

Related Failure Parts

Related

ECM Pin

No.

Related

Multiple

DTC

4JA1

-TC

(MT)

4JH1

-TC

(MT)

4JH1

-TC

(AT)

6E–104

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

DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE 7)

(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR VOLTAGE SUPPLY

CIRCUIT HIGH INPUT

DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE 9)

(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR VOLTAGE SUPPLY

CIRCUIT LOW INPUT

DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE B)

(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR OUTPUT CIRCUIT LOW

INPUT

DIAGNOSTIC TROUBLE CODE (DTC) P0100 (SYMPTOM CODE C)

(FLASH CODE 65) MASS AIR FLOW (MAF) SENSOR OUTPUT CIRCUIT HIGH

INPUT

Batt

µP

Batt

µP

Batt

µP

0.5
BLK/
URG

0.5
BRN/
RED

0.5
BLU/
RED

0.5
BLU/
RED

4JA1-TC

0.5
GRY/
YEL

97

46

61

0.5
WHT/
RED

83

0.5
GRN/
RED

88

0.5
BLK/
RED

92

0.5
BLK/
BLU

84

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

2

4

5

3

1

Battery
Voltage

ECM
Main Relay

IC

IC

IC

CPU

Engine
Control
Module
(ECM)

40

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

6E–105

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

Circuit Description

The mass air flow (MAF) sensor is part of the intake air
system. It is fitted between the air cleaner and
turbocharger and measure the mass air flowing into the
engine.
The mass air flow (MAF) sensor element measures the
partial air mass through a measurement duct on the
sensor housing.
The ECM monitors the MAF sensor supply voltage and
MAF sensor output voltage. The supply voltage is out of
range, DTC P0100 (Symptom Code 7) or P0100
(Symptom Code 9) will be stored. The output voltage
excessively high or low, DTC P0100 (Symptom Code B)
or P0100 (Symptom Code C) will be stored.

Diagnostic Aids

An intermittent may be caused by the following:

• Poor connections.

• Misrouted harness.

• Rubbed through wire insulation.

• Broken wire inside the insulation.
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 “Mass Air Flow” display on the Tech2 while
moving connectors and wiring harness related to the
sensor.

Diagnostic Trouble Code (DTC) P0100 (Symptom Code 7) (Flash Code 65)

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

Flash

Code

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

65

P0100

7

ON

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

MAF sensor power supply
voltage is more than 5.2V.

ECM uses mass air flow
1600mg/strk & EGR 10% con-
ditions as substitute.

9

ON

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

MAF sensor power supply
voltage is below 4.6V.

B

ON

Mass Air Flow (MAF) Sensor
Output Circuit Low Input

1. Engine speed is between

600rpm and 5000rpm.

2. MAF sensor output is below

-33.7mg/strk.

C

ON

Mass Air Flow (MAF) Sensor
Output Circuit High Input

1. Engine speed is between

600rpm and 5000rpm.

2. MAF sensor output is more

than 1784mg/strk.

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 7) stored as
“Present Failure”?

—

Go to Step 3

Refer to

Diagnostic Aids

and Go to Step

3

6E–106

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

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 7) 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

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 battery voltage

circuit.

Was the DVM indicated specified value?

Approximately

5.0V

Go to Step 11

Less than 1V:

Go to Step 7

More than

specified value:

Go to Step 8

7

Repair the open circuit between the ECM and MAF
sensor.
Was the problem solved?

—

Verify repair

Go to Step 8

Step

Action

Value(s)

Yes

No

92

88

83

2 3

4

5

C-51

C-57(B)

V

4

C-51

83

4

C-51

C-57(B)