Isuzu 4ja1, Workshop Manual

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TROUBLESHOOTING 6 – 1
SECTION 6
TROUBLESHOOTING
TABLE OF CONTENTS
PAGE PAGE
BASIC INSPECTION PROCEDURE....6– 2
1. HARD STARTING............................6– 3
1-1.Starter Motor Inoperative ..........6– 3
1-2. Starter Motor Operates But
Engine Does Not Turn Over ...........6– 3
1-3. Engine Turns Over But Does
Not Start Engine..............................6– 4
2. UNSTABLE IDLING.........................6– 5
3. INSUFFICIENT POWER ..................6– 6
4. EXCESSIVE FUEL
CONSUMPTION..................................6– 7
5. EXCESSIVE OIL CONSUMPTION ..6– 8
6. OVERHEATING ...............................6– 9
7. WHITE EXHAUST SMOKE..............6– 9
8. DARK EXHAUST SMOKE ...............6– 10
9. OIL PRESSURE DOES NOT RISE..6– 11
10. ABNORMAL ENGINE NOISE........6– 12
10-1. Engine Knocking ....................6– 12
10-2. Gas Leakage Noise.................6– 12
10-3. Continuous Noise ...................6– 13
10-4. Slapping Noise........................6– 13
10-5. Excessive Turbocharger
Noise ................................................6– 14
11. ROTATING PART WEAR OF
TURBOCHARGER..............................6– 14
12. OIL LEAKAGE FROM
TURBOCHRGER ................................6– 15
13. INSUFFICIENT ACCELERATION
AND/OR LACK OF POWER DUE
TO TURBOCHARGER........................6– 15
14. BATTERY CHARGING AND
NOISE PROBLEM ..............................6– 16
14-1. Battery No Charging...............6– 16
14-2. Battery Overcharging .............6– 16
14-3. Battery Under Charging .........6– 17
14-4. Battery Unstable Charging
Current .............................................6– 17
14-5. Charging System Noise .........6– 18
15. STARTER MOTOR PROBLEM .....6– 19
15-1. Starter Motor Pinion Engages
to Ring Gear But Engine Does
Not Turn Over..................................6– 19
15-2. Incorrect Pinion And Ring
Gear Engagement ...........................6– 19
15-3. Starter Motor Continues To
Run After The Starter Switch Is
Turned Off........................................6– 20
15-4. Excessive Commutator
Sparking ..........................................6– 20