1988 JEEP CHEROKEE relay

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Page 920 of 1378

JEEP CHEROKEE 1988 Service Repair Manual 1 - 25 Amp
Rear Washer/Wiper
2 - 15 Amp
Radio, Cigarette Lighter
3 - 25 Amp
Blower Motor
4 - 20 Amp
Turn Signal, Back-Up Lights, Rear Window Defogger Rel

Page 1015 of 1378

JEEP CHEROKEE 1988 Service Repair Manual reading of .2 volt or less. If reading exceeds .2 volt, clean or
repair cables and connections in circuit. Connect a voltmeter at
following locations:
* Positive lead to battery positive post a

reading of .2 volt or less. If reading exceeds .2 volt, clean or
repair cables and connections in circuit. Connect a voltmeter at
following locations:
* Positive lead to battery positive post and negative lead
to cable clamp.
* Positive lead to battery negative post and negative lead
to cable clamp.
3) If reading is other than zero on voltmeter, clean or
repair cables and connections in circuit. Connect a voltmeter at
following location:
* Positive lead to battery positive post and negative lead
to starter solenoid lead to the field coils.
4) If reading exceeds .3 volt, clean or repair cables and
connections in circuit.
SOLENOID TEST
1) Connect a heavy jumper wire on starter relay between
battery and solenoid terminals. If engine cranks, solenoid is okay. Go
to RELAY TEST .
2) If engine does not crank, check wiring and connections
from relay to starter. Repair or replace as necessary. If engine still
fails to crank, starter is defective.
RELAY TEST
1) On automatic transmission/transaxle vehicles, put gear
selector in "NEUTRAL" or "PARK". On manual transmission/transaxle
vehicles, put gear selector in "NEUTRAL". Set parking brake and block
wheels. DO NOT remove relay connector. Using a 12-volt test light,
check for battery voltage between starter relay battery terminal and
ground.
2) Use a jumper wire on starter relay between battery and
ignition terminals. If engine cranks starter relay is good. If starter
does not crank go to next step.
3) Connect another jumper wire to starter relay between
ground terminal and ground. Repeat above test. If engine cranks,
starter relay is good. Inspect transmission linkage for improper
adjustment (automatic transmission), defective neutral safety switch
(automatic transmission) or poor ground connection between relay
housing and mounting surface.
TESTING (ON BENCH)
STARTER SOLENOID
1) With starter removed, disconnect field coil wire from
field coil terminal on starter. Using an ohmmeter, check for
continuity between solenoid and field coil terminals.
2) Check for continuity between solenoid terminal solenoid
housing. Continuity should be present in both tests. If continuity is
present, solenoid is good. If no continuity is present, replace
solenoid. Reconnect field coil wire to field coil terminal.
ARMATURE FOR SHORT CIRCUIT
Place armature in a growler and hold a thin steel blade
parallel 3/16" above core while rotating armature slowly. If armature

Page 1020 of 1378

JEEP CHEROKEE 1988 Service Repair Manual 1) Voltage is applied to ignition switch through fuse "B" at
all times. Voltage is also applied at all times to the contact on
starter solenoid, terminal "B".
2) With ignition switch

1) Voltage is applied to ignition switch through fuse "B" at
all times. Voltage is also applied at all times to the contact on
starter solenoid, terminal "B".
2) With ignition switch in "START" position, battery voltage
is applied from fusible link "B", to ignition switch, and to the coil
of the starter relay to ground.
3) The coil of the starter relay engages closing relay
contacts. With start relay contacts closed, battery voltage is applied
to starter solenoid. Both solenoid windings are energized.
4) The pull-in and hold-in windings work together to
magnetically pull starter gear into ring gear. At the same time the
plunger also closes solenoid switch contacts in the starter solenoid.
Full battery voltage is now applied directly to the starter motor and
it cranks the engine.
NOTE: Use the amperage draw reading after the starter motor has
obtained its maximum RPM.
TROUBLE SHOOTING
* Check the battery for a broken or cracked casing.
* Check that all connections to battery and starter are clean
and tight.
* Check electrolyte level of battery. Levels that are too high
or too low may cause poor starter motor performance.
* Check battery by measuring specific gravity of electrolyte in
each cell with a hydrometer.
NOTE: No further testing or troubleshooting procedures available
from manufacturer.
STARTER SPECIFICATIONS
STARTER MOTOR SPECIFICATIONS TABLE\
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Application Specification
Cold Cranking Voltage (Minimum) ................ 9.6 Volts
Cold Cranking Amps
Cherokee & Wagoneer ........................... 350 Amps
Comanche ...................................... 120 Amps
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TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE\
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Application Ft. Lbs. (N.m)
Left Side Engine Mount-to-Block .................. 40 (54)
Left Side Engine Mount-to-Bell Housing Bolt ...... 35 (47)
Left Side Engine Mount-to-Frame Sill Bolt ........ 48 (65)
Starter Mounting Bolts ........................... 37 (50)
INCH Lbs. (N.m)
Starter Relay "B+" Terminal Nut ................... 18 (2)
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Page 1070 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \003 * S TE ER IN G U NIF O RM IN SPEC TIO N G UID ELIN ES * 1 988 J e ep C hero ke e GENERAL INFORMATION Steering, Suspension, Wheel Alignment, Wheels and Tires Mo$

Page 1077 of 1378

JEEP CHEROKEE 1988 Service Repair Manual threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A

threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Dust boot missing ....... 2 ........ (1) Suggest replacement.
Dust boot split ......... 2 ........ ( 1) Suggest replacement.
Dust boot torn .......... 2 ........ ( 1) Suggest replacement.
Housing cracked ......... A ............ Require replacement.
Lead routing incorrect .. B .. Require rerouting according to
vehicle manufacturer's
specifications.
Loose ................... B ... Require adjustment to vehicle
manufacturer's specifications.
Missing ................. C ............ Require replacement.
Output signal incorrect . A .. Require repair or replacement.
Wire lead damaged ....... A .. Require repair or replacement.
( 1) - This condition can lead to damage of the sliding magnet,
which, in turn, causes premature sensor failure.
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AIR RIDE SUSPENSION - MODULES
AIR RIDE SUSPENSION - MODULE INSPECTION\
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Condition Code Procedure
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Housing cracked ......... 2 .. Suggest repair or replacement.
Inoperative ............. A ............ Require replacement.
Missing ................. C ............ Require replacement.
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AIR RIDE SUSPENSION - RELAYS (COMPRESSOR)
AIR RIDE SUSPENSION - RELAY (COMPRESSOR) INSPECTION\
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Condition Code Procedure
Housing cracked ......... 2 ........ ( 1) Suggest replacement.
Intermittent ............ A ............ Require replacement.
Missing ................. C ............ Require replacement.
Output signal incorrect . A ............ Require replacement.
( 1) - If moisture enters the relay, it can reduce life
expectancy or impair function.
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AIR RIDE SUSPENSION - SWITCHES (ON/OFF)

Page 1093 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Bent .................... B

Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Bent .................... B ............ Require replacement.
Corroded, affecting
structural integrity ... A ............ Require replacement.
Holes distorted ......... A ............ Require replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped
(threads missing) ...... A ............ Require replacement.
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RELAY RODS
RELAY ROD INSPECTION\
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Condition Code Procedure
Attaching hardware
incorrect .............. A .......... Require replacement of
incorrect part, if available;
otherwise, replace relay rod.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part, if available;
otherwise, replace relay rod.
Attaching hardware
missing ................ C .. Require replacement of missing
part, if available; otherwise,
replace relay rod.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads,
if available; otherwise,
replace relay rod.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads, if
available; otherwise, replace
relay rod.
Bent .................... B ............ Require replacement.
Binding ................. A .......... ( 1) Further inspection
required.
Grease boot cracked ..... 2 ........ ( 2) Suggest replacement.
Grease boot missing ..... 2 ........ ( 3) Suggest replacement.
Grease boot torn ........ 2 ........ ( 4) Suggest replacement.
Grease fitting broken ... A ...... Require replacement grease
fitting.
Grease fitting missing .. C ... Require replacement of grease
fitting.
Grease fitting
won't seal ............. A ... Require replacement of grease
fitting.
Grease seal missing ..... 2 ........ ( 3) Suggest replacement.
Grease seal torn ........ 2 ........ ( 4) Suggest replacement.
Looseness (perceptible
horizontal movement) ... 1 ........ ( 5) Suggest replacement.
Looseness that is
excessive .............. B ..... ( 5)( 6) Require replacement.
Seized .................. A ............ Require replacement.
Stud bent ............... B ........ ( 7) Require replacement.

Page 1131 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \003 * S U SPEN SIO N U NIF O RM IN SPEC TIO N G UID ELIN ES * 1 988 J e ep C hero ke e GENERAL INFORMATION Steering, Suspension, Wheel Alignment, Wheels and Tires M$

Page 1138 of 1378

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