ISUZU Workshop Manual for 4JA1 AND 4JHI Models ( Isuzu Repair Manual)
Workshop Manual for 4JA1 AND 4JHI Table of Content
BASIC INSPECTION PROCEDURE
- HARD STARTING
- Starter Motor Inoperative
- Starter Motor Operates But Engine Does Not Turn Over
- Engine Turns Over But Does Not Start Engine
- UNSTABLE IDLING
- INSUFFICIENT POWER
- EXCESSIVE FUEL CONSUMPTION
- EXCESSIVE OIL CONSUMPTION
- OVERHEATING
- WHITE EXHAUST SMOKE
- DARK EXHAUST SMOKE
- OIL PRESSURE DOES NOT RISE
- ABNORMAL ENGINE NOISE
- Engine Knocking
- Gas Leakage Noise
- Continuous Noise
- Slapping Noise
- Excessive Turbocharger Noise
- ROTATING PART WEAR OF TURBOCHARGER
- OIL LEAKAGE FROM TURBOCHRGER
- INSUFFICIENT ACCELERATION AND/OR LACK OF POWER DUE TO TURBOCHARGER
- BATTERY CHARGING AND NOISE PROBLEM
- Battery No Charging
- Battery Overcharging
- Battery Under Charging
- Battery Unstable Charging Current
- Charging System Noise
- 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.
- The battery conditions.
- The terminal connection condition.
- The battery charge condition or battery power weakness.
- The fan belt loosen or broken.
- The main fuse condition (open or not).
- 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 | |
Pages | : 564 Pages |
Language | : English |
File Size | : 11 MB |
