Isuzu N-Series. Manual — part 288
HSA (HILL START AID) 5A5-31
DTC 91 Solenoid Valve Drive Signal and Solenoid Valve Monitor Conditions Are Erratic
Step
Action
Value
YES
NO
1
Is the connector of the HSA valve normal?
—
2
Disconnect the connector of HSA valve. Mea-
sure the resistance in HSA valve. Is the mea-
surement completed?
55.8
Ω±10%
3
Repair the connector.
Is the repair completed?
—
4
Measure the resistances between the HSA
valve connector terminals and the HSA con-
trol unit connector terminals 3 “J-155” and 28
“B-285” (front side), and 1 “J-155” and 8 “B-
285” (rear side) (with the connector discon-
nected). Is the measurement completed?
Less than 5
Ω
5
Replace the HSA valve.
Is the repair completed?
—
6
Is the battery voltage applied between the
HSA valve connector terminals 2 “J-155”, 4 “J-
155” and the body ground (with connector dis-
connected)?
20 V or more
7
Repair the open circuit of the circuit that has
resistance of 5
Ω or more.
Is the repair completed?
—
8
Replace the HSA control unit.
Is the repair completed?
—
9
Repair the open circuit of the circuit that has
resistance of less than 20V.
Is the repair completed?
—
10
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
5A5-32 HSA (HILL START AID)
N5A3027E
HSA (HILL START AID) 5A5-33
List of Trouble Phenomenon
For the troubles which are not appeared as trouble
code, interview the customer and the test run the vehicle
to check for trouble symptom, and perform the diagnosis
according the symptom.
Possible cause
Trouble
symptom
Door
switch
Park-
ing
brake
switch
Clutch
fluid
pres-
sure
switch
HSA
reset
switch
HSA
valve,
pipe
ACG
HSA
lamp
(includ
ing
meter)
HSA
off
switch
HSA
adjust
switch
Speed
sensor
Neu-
tral
switch
Stop
lamp
switch
Clutch
sensor
Back-
up
lamp
switch
Diode
box
Action to
be taken
HSA does not
operate.
❍
❍
❍
❍
❍
Refer to
the trouble
symptom.
HSA does not
release though
the HSA off
switch is
depressed.
❍
❍
Refer to
the trouble
symptom.
HSA does not
release though
the vehicle is
operated to
start. (HSA indi-
cator lamp
remains ON.)
❍
❍
Refer to
the trouble
symptom.
HSA does not
release though
the parking
brake is
applied.
❍
Refer to
the trouble
symptom.
HSA indicator
lamp does not
come on. (HSA
does not oper-
ate.)
❍
❍
❍
❍
❍
Refer to
the trouble
symptom.
HSA indicator
lamp does not
come on. (HSA
does operate.)
❍
Refer to
the trouble
symptom.
HSA indicator
lamp does not
go off. (HSA
released.)
❍
Refer to
the trouble
symptom.
Buzzer does
not sound
though the door
is opened while
HSA operating.
❍
❍
Refer to
the trouble
symptom.
HSA indicator
lamp blinks
abnormally and
does not out-
put the trouble
cord during
self-diagnosis.
❍
❍
Refer to
the trouble
symptom.
Buzzer beeps
continuously
during self-
diagnosis (trou-
ble code out-
put impossible)
❍
❍
Refer to
the trouble
symptom.
5A5-34 HSA (HILL START AID)
Symptom: HSA Does not Operate
Step
Action
Value
YES
NO
1
Does the HSA indicator lamp not illuminate?
—
2
Is the fuse “F-17” normal?
—
3
Check the HSA valve and the pipe, and repair
or replace.
Is the repair completed?
—
4
Measure the battery voltage between the HSA
control unit connector terminal 14 “B-285” and
the body ground (with connector discon-
nected). Is the measurement completed?
20 V or more
5
Repair the short circuit in the circuit and the
parts (clutch fluid pressure switch, HSA valve,
etc.) connected to the fuse “F-17”, and then
replace the fuse.
Is the repair completed?
—
6
Measure the resistance between the HSA
control unit connector terminal 30 “B-285” and
the body ground (with connector discon-
nected). Is the measurement completed?
Less than 5
Ω
7
Repair the open circuit between the fuse “F-
17” and 14 “B-285”.
Is the repair completed?
—
8
Measure the battery voltage between the HSA
control unit connector terminal 2 “B-285” and
the body ground (with connector discon-
nected) with the parking brake not applied. Is
the measurement completed?
20 V or more
9
Repair the open circuit or improper grounding
between 30 “B-285” and the ground terminal
“B-7” (in front of the frame LH) (with the con-
nector disconnected).
Is the repair completed?
—
10
Is the fuse “F-5” normal?
—
11
Is the continuity (resistance) of the parking
brake switch normal?
—
12
Measure the continuity (resistance) in the
switch side terminal of the stop lamp switch.
Does the resistance exist when the brake
pedal depressed, and no resistance when the
brake pedal released (with the connector dis-
connected)?
—
13
Check and repair the short circuit in the stop
lamp circuit, and then replace the fuse.
Is the repair completed?
—
14
Measure the battery voltage between the stop
lamp switch connector terminal 1 “B-66” and
the body ground (with connector discon-
nected). Is the measurement completed?
20V or more
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