Isuzu N-Series. Manual - part 285

HSA (HILL START AID) 5A5-19

DTC 03 Back-up Fuse Open

Step

Action

Value

YES

NO

1

Check the fuse “F-19”.

Is the fuse “F-19” normal?

—

Go to Step2

Go to Step3

2

Check for battery voltage between the HSA
control unit connector terminal 29 “B-285” and
the body ground.

Does it have the battery voltage?

20 V or more

Go to Step6

Go to Step7

3

Repair the short circuit in the circuit and the
parts connected to the fuse “F-19”.

Is the repair completed?

—

Go to Step4

Go to Step3

4

Install a new fuse with the HSA control unit
connector “B-285” disconnected.

Is the fuse blown?

—

Go to Step2

Go to Step5

5

Connect the connector of the HSA control
unit.

Is the fuse blown?

—

Go to Step8

Go to Step10

6

Check the connector.

Is the connector of the HSA control unit nor-
mal?

—

Go to Step8

Go to Step9

7

Repair the open circuit between the fuse “F-
19” and 29 “B-285”.

Is the repair completed?

—

Go to Step10

Go to Step7

8

Replace the HSA control unit.

Is the replacement completed?

—

Go to Step10

Go to Step8

9

Repair the connector.

Is the repair completed?

—

Go to Step10

Go to Step9

10

After HSA repair, make sure no trouble is
found during self-diagnosis.

Is this step completed?

—

—

Go to Step10

5A5-20 HSA (HILL START AID)

N5A3021E

HSA (HILL START AID) 5A5-21

DTC 08 Clutch Sensor Output Voltage Fault

Step

Action

Value

YES

NO

1

Check the clutch sensor.

Is the clutch sensor normal?

—

Go to Step2

Go to Step3

2

Measure the resistances between the HSA
control unit and the clutch sensor connector
terminals 24 “B-285” and 3 “B-103”, 25 “B-
285” and 2 “B-103”, 26 “B-285” and 1 “B-103”.
Are all the resistances less than 5

Ω?

Less than 5

Ω

Go to Step4

Go to Step5

3

Replace the clutch sensor.

Is the replacement completed?

2k

Ω±400

Go to Step4

Go to Step3

4

Replace the HSA control unit.

Is the replacement completed?

—

Go to Step6

Go to Step4

5

Repair the open circuit of the circuit that has
resistance of 5

Ω or more.

Is the repair completed?

—

Go to Step6

Go to Step5

6

After HSA repair, make sure no trouble is
found during self-diagnosis.

Is this step completed?

—

—

Go to Step6

5A5-22 HSA (HILL START AID)

N5A3022E