Isuzu N-Series. Service manual - part 294

HSA (HILL START AID) 5A5-55

HSA Valve

Removal

1. Remove the undercover.

Legend

1. Undercover
2. HSA valve

2. Disconnect the HSA valve connector.

Legend

1. Hose
2. Bumper
3. Brake pipe

3. Remove the radiator grille.
4. Disconnect the connection of the brake pipe and

the hose.

Legend

1. HSA valve
2. Pipe

5. Disconnect the pipe.
6. Disconnect the HSA valve.

Installation

1. Install the two installing bolts of HSA valve.

Tighten:

Bolts to 21 N

⋅m (2.1 kg⋅m/15.5 lb⋅ft)

2. Install the brake pipe.

Tighten:

Brake pipe to 16 N

⋅m (1.6 kg⋅m/11.8 lb⋅ft)

3. Connect the connector.

Caution:

• Make sure there is no dust or foreign materials in

and around the pipe connection.

• Be careful to correctly connect the pipe.

• After installation, bleed air from the brake system

completely.

• Be sure to use fresh specified brake fluid.

N5A3038E

N5A3039E

N5A3040E

5A5-56 HSA (HILL START AID)

Clutch Sensor

Removal

1. Disconnect the connection of the connector.
2. Remove the two installing bolts of the clutch sen-

sor.

Legend

1. Clutch pedal
2. Clutch sensor
3. Connector

Inspection

Disconnect the connector of the clutch sensor, and mea-
sure the resistance between terminals.

1. Terminal 1 — Terminal 3 — 2k

Ω±400Ω

2. Clutch pedal operated

• Terminal 2 — Terminal 1 — Approx. 400

Ω —

2.8k

Ω

Adjustment

1. Loosen the installing bolts of the clutch sensor.
2. Turn the starter switch to “ON”.
3. Adjust the sensor installing position so that the volt-

age between the clutch sensor connector terminals
2 (SIG) — terminal 1 (GND) is 0.5

±0.2V when the

clutch pedal is fully released (clutch fully engaged).

Caution:

• Adjust with the clutch sensor connector connected

to the body side harness connector.

• For voltage check, connect the tester from the

backside of the body side connector.

Legend

1. Clutch sensor installing nut
2. Body side connector

N5A3041E

N5A3042E

N5A3043E

HSA (HILL START AID) 5A5-57

HSA Off Switch

Removal

1. Remove the meter clutster.
2. Disconnect the connector.
3. Remove the HSA off switch.

• Remove it while pressing the switch claw from

the backside of the instrument panel.

Inspection

Check for continuity between the switch terminals.

Installation

Install in the reverse order of removal.

N5A3067E

N5A3063E

5A5-58 HSA (HILL START AID)

HSA Reset Switch

Removal

1. Remove the HSA reset switch.
2. Disconnect the connector.

Legend

1. HSA reset switch
2. Connector

Inspection

Check for continuity between the switch terminals.

Installation

Install in the reverse order of removal.

N5A3046E

N5A3045E