Isuzu N-Series. Service manual — part 290
HSA (HILL START AID) 5A5-39
N5A3029E
5A5-40 HSA (HILL START AID)
Symptom: HSA Does not Release Though the Vehicle Is Operated to Start (HSA Indicator
Lamp Remains ON)
Step
Action
Value
YES
NO
1
Is the continuity (resistance) of neutral switch
normal?
—
2
Is the clutch sensor properly installed (check
the trouble code “08”)?
—
3
Repair or replace the neutral switch.
Is the repair completed?
—
4
Is the resistance between the clutch sensor
terminals within the specified range?
—
5
After installation, perform the initial adjust-
ment.
Is the repair completed?
—
6
Replace the HSA control unit.
Is the repair completed?
—
7
Replace the clutch sensor.
Is the repair completed?
—
8
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
HSA (HILL START AID) 5A5-41
N5A3030E
5A5-42 HSA (HILL START AID)
Symptom: HSA Does not Release Though the Parking Brake Is Applied
Step
Action
Value
YES
NO
1
Is the continuity (resistance) of the parking
brake switch normal?
—
2
Measure the battery voltage between the
parking brake switch connector terminal 1 “N-
6” and the body ground (with the connector
disconnected). Is the measurement com-
pleted?
20V or more
3
Repair or replace the parking brake switch.
Is the repair completed?
—
4
Measure the battery voltage between the HSA
control unit connector terminal 2 “B-285” and
the body ground (with connector discon-
nected). Is the measurement completed?
20V or more
5
Repair the improper connection or open circuit
between 5 “B-51” (meter) and 1 “N-6”.
Is the repair completed?
—
6
Replace the HSA control unit.
Is the repair completed?
—
7
Repair the open circuit between 5 “B-51”
(meter) and 2 “B-285”.
Is the repair completed?
—
8
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
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