Isuzu N-Series. Manual - part 632

ENGINE ELECTRICAL 6D-21

Diagnosis

General On-Vehicle Inspection
The operating condition of charging system is indicated by the charge warning lamp. The warning lamp comes on
when the starter switch is turned on “ON” position. The charging system operates normally if the lamp goes off when
the engine starts. If the warning lamp shows abnormality or if undercharged or overcharged battery condition is sus-
pected, perform diagnosis by checking the charging system as follows:
For 4JH1

1. Check visually the belt and wiring connector.
2. With the engine in stop status, turn the starter

switch to “ON” position and observe the warning
lamp.

• If lamp does not come on:

Disconnect wiring connector from generator, and
ground the terminal “L” on connector side.

• If lamp comes on:

Repair or replace the generator.

N6A3523E

6D-22 ENGINE ELECTRICAL

On-Vehicle Service

Component

Generator

Legend

1. A/C compressor drive belt

7. Power steering oil pipe bracket

2. A/C compressor assembly

8. AC generator fixing bolts

3. Harness connector

9. AC generator assembly

4. Vacuum hose

10. Bracket

5. Oil hose

11. Clip

6. AC generator drive belt

12. Lock bolt

N6A3524E

ENGINE ELECTRICAL 6D-23

Removal

Preparation

• Disconnect battery ground cable.

1. A/C Compressor Drive Belt (A/C Model)

• Loosen the idler pulley lock nut
• Loosen the adjust bolt and remove the drive

belt.

2. A/C Compressor Assembly (A/C Model)

• Disconnect the clutch harness connector.
• Remove the A/C compressor fixing bolts and

temporarily tighten the A/C compressor to
chassis frame side use the wire.

3. Harness Connector (A/C Model)

• Disconnect the “L”, “S”, “IG” terminal.
• Disconnect the “B” terminal.

4. Vacuum Hose (Exhaust Brake Model)

• Remove the vacuum hose to vacuum tank and

exhaust actuator.

5. Oil Hose

• Remove the oil hose from oil pan.
• Remove the oil hose of vacuum pump side.

6. AC Generator Drive Belt

• Loosen the adjust plate fixing bolt.
• Remove the adjust bolt.
• Loosen the AC Generator fixing bolt then re-

move the fan belt.

7. Power Steering Oil Pipe Bracket (P/S Model)

• Remove the oil pressure pipe bracket fixing bolt

and pipe clip bolt.

• Remove the oil suction pipe clip bolt.

8. AC Generator Fixing Bolts
9. AC Generator Assembly

Installation

1. AC Generator Assembly

• Set the AC generator.

2. AC Generator Fixing Bolts

• Temporary install the AC generator fixing bolt.

3. Power Steering Oil Pipe Bracket (P/S Model)

• Install the oil pipe bracket and tighten bolts to

the specified torque.

Tighten:
Pipe Bracket Bolt to 19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

• Install the suction pipe clip bolt and tighten bolt

to the specified torque.

Tighten:
Pipe Clip Bolt to 10 N

⋅m (1 kg⋅m/87 lb⋅in)

• Install the pressure pipe and suction pipe clip

bolt, then tighten bolt to the specified torque.

N6A3525E

N6A3526E

N6A3526E

6D-24 ENGINE ELECTRICAL

Tighten:
Pipe Clip Bolt to 10 N

⋅m (1 kg⋅m/87 lb⋅in)

4. AC Generator Drive Belt

• Install the AC Generator drive belt and adjust

belt tension.

• Depress the drive belt mid-portion with a 98 N

(10 kg/22 lb) force.

4JG2

4JB1

• Install the fixing bolt and tighten bolt to the

specified torque.

Tighten:

• Generator Fixing Bolt to 40 N

⋅m (4.1/ kg⋅m/30 lb⋅ft)

• Adjust Plate Fixing Bolt to 19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

5. Oil Hose

• Install the oil hose (1) to vacuum pump.
• Install the oil hose (2) to oil pan.

6. Vacuum Hose (Exhaust Brake Model)

• Install the vacuum hose to vacuum tank and ex-

haust actuator.

7. Harness Connector (A/C Model)

• Connect the “L”, “S”, “IG” terminal and “B” ter-

minal connectors.

8. A/C compressor Assembly (A/C Model)

• Install the compressor assembly and tighten

bolts to the specified torque.

Tighten:
Compressor Bolt to 19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

Drive Belt Deflection

mm (in)

8 (0.31) — 12 (0.47)

Legend

1. A/C compressor drive belt
2. P/S oil pump drive belt
3. AC generator fan pulley drive belt

N6A3297E

N6A3295E

Legend

1. AC compressor drive belt & PS pump drive belt
2. AC generator & fan pulley drive belt

N6A3299E