ISUZU Workshop Manual for 4JA1 AND 4JHI ENGINE

ISUZU Workshop Manual for 4JA1 AND 4JHI Models ( Isuzu Repair Manual)

Workshop Manual for 4JA1 AND 4JHI Table of Content

BASIC INSPECTION PROCEDURE

  1. HARD STARTING
    • Starter Motor Inoperative
    • Starter Motor Operates But Engine Does Not Turn Over
    • Engine Turns Over But Does Not Start Engine
  2. UNSTABLE IDLING
  3. INSUFFICIENT POWER 
  4. EXCESSIVE FUEL CONSUMPTION
  5. EXCESSIVE OIL CONSUMPTION 
  6. OVERHEATING 
  7. WHITE EXHAUST SMOKE
  8. DARK EXHAUST SMOKE
  9. OIL PRESSURE DOES NOT RISE
  10. ABNORMAL ENGINE NOISE
    • Engine Knocking
    • Gas Leakage Noise
    • Continuous Noise
    • Slapping Noise
    • Excessive Turbocharger Noise
  11. ROTATING PART WEAR OF TURBOCHARGER
  12. OIL LEAKAGE FROM TURBOCHRGER
  13. INSUFFICIENT ACCELERATION AND/OR LACK OF POWER DUE TO TURBOCHARGER
  14. BATTERY CHARGING AND NOISE PROBLEM
    • Battery No Charging
    • Battery Overcharging
    • Battery Under Charging
    • Battery Unstable Charging Current
    • Charging System Noise
  15. STARTER MOTOR PROBLEM 
    • Starter Motor Pinion Engages to Ring Gear But Engine Does Not Turn Over
    • Incorrect Pinion And Ring Gear Engagement
    • Starter Motor Continues To Run After The Starter Switch Is Turned Off
    • Excessive Commutator Sparking

Isuzu 4JA1 AND 4JHI Basic Inspection Procedure

Follow the under inspection procedure, when the problem vehicle comes workshop.

Step

Inspection point

Inspection result

YES

NO

1

Check the check engine lamp

Is the check engine lamp turn ON ?

Go to section

6E “On Board Diagnostic

(OBD) System

Check"

Go to Step 2

2

The battery fluid level and the gravity

Was the problem found?

Re-charge the battery or

replace the battery

Go to Step 3

3

The engine coolant capacity

Was the problem found?

Replenish the

engine coolant

Go to Step 4

4

The engine oil level

Was the problem found?

Replenish the engine oil

Go to Step 5

5

The air cleaner element

Was the problem found?

Clean or replace

Go to Step 6

6

The piping fixing condition (oil, vacuum and fuel piping)

Was the problem found?

Return normal condition

Go to Step 7

7

The drive belt tension and break

Was the problem found?

Re-adjust the tension or replace

Go to Step 8

8

Go to section 6E “On Board Diagnostic (OBD) System

Check”

Was the problem found?

Verify repair

Go to Step 9

9

Go to mechanical

troubleshooting chart

Was the problem found?

Verify repair

1. Hard Starting

Inspect the following items before diagnosis.

  1. The battery conditions.
    • The terminal connection condition.
    • The battery charge condition or battery power weakness.
  2. The fan belt loosen or broken.
  3. The main fuse condition (open or not).
  4. Fuel quantity level.

Step

Action

Value(s)

Yes

No

1

Check the starter switch.

Does the starter switch work?

Go to Step 2

Repair or replace the starter switch

2

Check the starter relay.

Does the starter relay work?

Go to Step 3

Repair or replace the starter relay

3

Check the magnetic switch.

Does the magnetic switch work?

Go to Step 4

Repair or replace the

magnetic switch

4

Check the pinion gear condition on the starter motor. Was the condition normal?

Go to Step 5

Replace the

pinion gear

5

Check the brush wear or brush spring weakness. Was the condition normal?

Replace the starter motor assembly

Repair or replace the

brush or brush spring

 

Readmore and ISUZU Workshop Manual for 4JA1 AND 4JHI ENGINE

Title : ISUZU Workshop Manual for 4JA1 AND 4JHI ENGINE
Format : PDF
Pages : 564 Pages
Language : English
File Size : 11 MB

 

ISUZU Workshop Manual for 4JA1 AND 4JHI ENGINE