Hummer H2. Manual — part 23

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures

Fig. 2: Ignition Primary Trouble Shooting Chart

STARTER TROUBLE SHOOTING

BASIC STARTER TROUBLE SHOOTING CHART

NOTE:

This is GENERAL information. This article is not intended to be specific to any
unique situation or individual vehicle configuration. The purpose of this Trouble
Shooting information is to provide a list of common causes to problem
symptoms. For model-specific Trouble Shooting, refer to SUBJECT,
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing.

CONDITION & POSSIBLE CAUSE

CORRECTION

Starter Fails to Operate

Dead battery or bad connections between
starter and battery

Check battery charge and all wires and

connections to starter

Ignition switch faulty or misadjusted

Adjust or replace ignition switch

Open circuit between starter switch
ignition terminal on starter relay

Check and repair wires and connections as

necessary

Starter relay or starter defective

See Testing in STARTER article

Open solenoid pull-in wire

Testing in STARTER article

Starter Does Not Operate and Headlights Dim

Weak battery or dead cell

Charge or replace battery as necessary

Loose or corroded battery connections

Check that battery connections are clean

and tight

Internal ground in starter windings

See Testing in STARTER article

Grounded starter fields

See Testing in STARTERS

Armature rubbing on pole

See STARTER article shoes

Starter Turns but Engine Does Not Rotate

Starter clutch slipping

See STARTER article

Broken clutch housing

See STARTER article

Pinion shaft rusted or dry

See STARTER article

Engine basic timing incorrect

See Ignition Timing in TUNE-UP article

Broken teeth on engine flywheel

Replace flywheel and check for starter

pinion gear damage

Starter Will Not Crank Engine

Faulty overrunning clutch

See STARTER article

Broken clutch housing

See STARTER article

Broken flywheel teeth

Replace flywheel and check for starter

pinion gear damage

Armature shaft sheared or reduction gear
teeth stripped

See STARTER article

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures

Weak battery

Charge or replace battery as necessary

Faulty solenoid

See On-Vehicle Tests in STARTER

article

Poor grounds

Check all ground connections for tight

and clean connections

Ignition switch faulty or misadjusted

Adjust or replace ignition switch as

necessary

Starter Cranks Engine Slowly

Battery weak or defective

Charge or replace battery as necessary

Engine overheated

See ENGINE COOLING SYSTEM

article

Engine oil too heavy

Check that proper viscosity oil is used

Poor battery-to-starter connections

Check that all between battery and starter

are clean and tight

Current draw too low or too high

See Bench Tests in STARTER article

Bent armature, loose pole shoes screws or
worn bearing

See STARTER article

Burned solenoid contacts

Replace solenoid

Faulty starter

Replace starter

Starter Engages Engine Only Momentarily

Engine timing too far advanced

See Ignition Timing in TUNE-UP article

Overrunning clutch not engaging properly

Replace overrunning clutch. See

STARTER article

Broken starter clutch

See STARTER article

Broken teeth on engine flywheel

Replace flywheel and check starter pinion

gear for damage

Weak drive assembly thrust spring

See STARTER article

Weak hold-in coil

See Bench Tests in STARTER article

Starter Drive Will Not Engage

Defective point assembly

See Testing in STARTER article

Poor point assembly ground

See Testing in STARTER article

Defective pull-in coil

Replace starter solenoid

Starter Relay Does Not Close

Dead battery

Charge or replace battery as necessary

Faulty wiring

Check all wiring and connections leading

to relay

Neutral safety switch faulty

Replace neutral safety switch

Starter relay faulty

Replace starter relay

Starter Drive Will Not Disengage

Starter motor loose on mountings

Tighten starter attach bolts

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures

AIR CONDITIONING & HEAT

AIR CONDITIONING TROUBLE SHOOTING

Worn drive end bushing

See STARTER article

Damaged engine flywheel teeth

Replace flywheel and starter pinion gear

for damage

Drive yolk return spring broken or missing

Replace return spring

Faulty ignition switch

Replace ignition switch

Insufficient clearance between winding
leads to solenoid terminal and main
contact in solenoid

Replace starter solenoid

Starter clutch not disengaging

Replace starter clutch

Ignition starter switch

Replace ignition switch contacts sticking

Starter Relay Operates but Solenoid Does Not

Faulty solenoid switch, switch connections
or relay

Check all wiring between relay and

solenoid or replace relay or solenoid as

necessary

Broken lead or loose soldered connections

Repair wire or wire connections as

necessary

Solenoid Plunger Vibrates When Switch is Engaged

Weak battery

Charge or replace battery as necessary

Solenoid contacts corroded

Clean contacts or replace solenoid

Faulty wiring

Check all wiring leading to solenoid

Broken connections inside switch cover

Repair connections or replace solenoid

Open hold-in wire

solenoid

Low Current Draw

Worn brushes or weak brush springs

Replace brushes or brush springs as

necessary

High Pitched Whine During Cranking Before Engine Fires but Engine Fires and Cranks
Normally

Distance too great between starter pinion
and flywheel

Align starter or check that correct starter

and flywheel are being used

High Pitched Whine After Engine Fires With Key released. Engine Fires and Cranks
Normally

Distance too small between starter pinion
and flywheel

Flywheel runout contributes to the

intermittent nature

WARNING:

This is GENERAL information. This article is not intended to be specific to
any unique situation or individual vehicle configuration. The purpose of
this Trouble Shooting information is to provide a list of common causes
to problem symptoms. For model-specific Trouble Shooting, refer to

1998 Chevrolet Pickup C1500

GENERAL INFORMATION Trouble Shooting - Basic Procedures