DIAGNOSIS AND TESTING
STARTING SYSTEM
DIAGNOSIS
The battery, starting system and charging system
in the vehicle operate with one another, and must be
tested as a complete system. In order for the engine
to start and the battery to charge properly, all of the
components that are used in these systems must per-
form within specifications. The service information
for these systems has been separated within this ser-
vice manual to make it easier to locate the specific
information
you
are
seeking.
However,
when
attempting to diagnose any of these systems, it is
important that you keep their interdependency in
mind.
The diagnostic procedures used for the battery,
starting system and charging system include the
most basic conventional diagnostic methods, to the
more sophisticated On-Board Diagnostics (OBD) built
into the Powertrain Control Module (PCM). Use of an
induction-type milliampere ammeter, a volt/ohmme-
ter, a battery charger, a carbon pile rheostat (load
tester) and a 12-volt test lamp may be required. All
OBD-sensed systems are monitored by the PCM.
Each monitored circuit is assigned a Diagnostic Trou-
ble Code (DTC). The PCM will store a DTC in elec-
tronic memory for any failure it detects. Refer to
Charging System, On-Board Diagnostic Test in
the index of this service manual for the location of
the proper on-board diagnostic test procedures.
Starting System Diagnosis
Condition
Possible Cause
Correction
Starter fails to operate.
1. Battery discharged or
faulty.
2. Starting circuit wiring
faulty.
3. Starter relay faulty.
4. Ignition switch faulty.
5. Clutch pedal position
switch faulty.
6. Park/Neutral position
switch faulty or
misadjusted.
7. Starter solenoid faulty.
8. Starter motor faulty.
1. Refer to Battery in the index of this service manual for
the location of the proper battery diagnosis and testing
procedures. Replace the faulty battery, as required.
2. Refer to Starting System in the index of this service
manual for the location of complete starting system wiring
diagrams. Test and repair the faulty starter feed and/or
control circuits, as required.
3. Refer to Starter Relay in the index of this service
manual for the location ofr the proper starter relay
diagnosis and testing procedures. Replace the faulty
starter relay, as required.
4. Refer to Ignition Switch and Key Lock Cylinder in the
index of this service manual for the location of the proper
ignition switch diagnosis and testing procedures. Replace
the faulty ignition switch, as required.
5. Refer to Clutch Pedal Position Switch in the index of
this service manual for the location of the proper clutch
pedal position switch diagnosis and testing procedures.
Replace the faulty clutch hydraulic linkage unit, as
required.
6. Refer to Park/Neutral Position Switch in the index of
this service manual for the location of the proper
park/neutral position switch diagnosis and testing
procedures. Replace the faulty park/neutral position
switch, as required.
7. Refer to Starter Motor in the index of this service
manual for the location of the proper starter solenoid
diagnosis and testing procedures. Replace the faulty
starter motor, as required.
8. Refer to Starter Motor in the index of this service
manual for the location of the proper starter motor
diagnosis and testing procedures. Replace the faulty
starter motor, as required.
8B - 4
STARTING SYSTEMS
XJ