Isuzu N-Series. Service manual — part 289
HSA (HILL START AID) 5A5-35
15
Repair or replace the stop lamp switch.
Is the repair completed?
—
16
Connect the connector of the stop lamp
switch. Measure the battery voltage between
the HSA control unit connector terminal 19 “B-
285” and the body ground (with connector dis-
connected) with the brake pedal depressed. Is
the measurement completed?
20V or more
17
Repair the open circuit between the fuse “F-5”
and 1 “B-66” (stop lamp switch).
Is the repair completed?
—
18
Is the continuity (resistance) of neutral switch
normal?
—
19
Repair the open circuit between 2 “B-66” and
19 “B-285”.
Is the repair completed?
—
20
Measure the battery voltage between the neu-
tral switch connector terminal 2 “J-50” and the
body ground (with the connector discon-
nected). Is the measurement completed?
20V or more
21
Repair or replace the neutral switch.
Is the repair completed?
—
22
Connect the connector “J-50” of the neutral
switch.
Measure the battery voltage between the HSA
control unit connector terminal 18 “B-285” and
the body ground (with connector discon-
nected) with the gear in neutral. Is the mea-
surement completed?
20V or more
with gear in
neutral, 0V
with gear
except in
neutral
23
Repair the open circuit between the fuse “F-
28” and 2 “J-50”.
Is the repair completed?
—
24
Measure the voltage between the HSA control
unit connector terminal 10 “B-285” and the
body ground (connector disconnected) with
engine running. Is the measurement com-
pleted?
Approx. 24 V
25
Repair the open circuit between 1 “J-50” and
18 “B-285”.
Is the repair completed?
—
26
Replace the HSA control unit.
Is the repair completed?
—
27
Repair the open circuit between the AC gen-
erator “L” terminal and 10 “B-285”.
Is the repair completed?
—
28
Replace the HSA control unit.
Is the repair completed?
—
Step
Action
Value
YES
NO
5A5-36 HSA (HILL START AID)
29
Repair or replace the parking brake switch.
Is the repair completed?
—
30
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
Step
Action
Value
YES
NO
HSA (HILL START AID) 5A5-37
0.5BR
0.3BR/W
0.3W/B
0.5B
30
12
PARKING
BRAKE
HSA
HSA CONTROL UNIT
B-51
18
5
B-52
2
B-285
B-51
B-7
B-285
HEADLIGHT BRACKET (LH)
J-9
FRAME
PARKING
BRAKE
SWITCH
12
2
0.3W/V
0.3W/V
3
4
10
3
0.5W/B
0.3W/B
0.5W/B
0.5W/R
0.5B
0.5W/B
WITH
HBB
W/O
HBB
0.3W/R
B-285
8
H-5
H-5
RELAY ;
BUZZER
SHORT CONNECTOR
X-33
9
7
X-33
8
X-33
H-12
J-128
J-128
4
3
2
J-128
1
J-128
N-6
1
HBB
LEVEL
SWITCH
DIODE
BOX
18
B-285
0.3B/L
0.5B/Y
NEUTRAL SWITCH
0.5B/L
37
F-28
ECM
J-50
H-5
J-50
2
1
FUSE
2B
14
B-285
0.5B/O
19
B-285
0.5G
0.5G/Y
STOP LAMP SWITCH
B-66
B-66
1
2
F-5
10A
F-17 10A
3B
METER
N5A3028E
5A5-38 HSA (HILL START AID)
Symptom: HSA Does not Release Though the HSA Off Switch Is Depressed
Step
Action
Value
YES
NO
1
Is the continuity (resistance) of the HSA off
switch normal?
—
2
Replace the HSA valve.
Is the repair completed?
—
3
Replace the HSA off switch.
Is the repair completed?
—
4
After HSA repair, make sure no trouble is
found during self-diagnosis.
Is this step completed?
—
—
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