1988 JEEP CHEROKEE Service Repair Manual

Connector melted ........ A ........ (1) Require replacement.
Connector missing ....... C ............ Require replacement.
Missing ................. C ............ Require replacement.
Out of adjustment ....... B ........... Require adjustment or
replacement.
Output signal incorrect . B ............ Require replacement.
Terminal burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance ... A .. Require repair or replacement.
Terminal corroded, not
affecting performance ... 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance ... 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
( 1) - Determine cause and correct prior to replacement of part.
( 2) - Determine cause and correct prior to repair or replacement
of part.









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BULB SOCKETS
BULB SOCKET INSPECTION








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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Broken .................. A .. Require repair or replacement.
Bulb seized in socket ... A .. Require repair or replacement.
Burned, affecting
performance ............ A .............. ( 1) Require repair
or replacement.
Burned, not affecting
performance ............ 2 .............. ( 1) Suggest repair
or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector missing ....... C ............ Require replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A .............. ( 2) Require repair
or replacement.
Corroded, affecting
performance ............ A .. Require repair or replacement.
Corroded, not affecting
performance ............ 2 .. Suggest repair or replacement.
Leaking ................. A .. Require repair or replacement.
Melted .................. A ........ ( 2) Require replacement.

Shorted ................. A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A .............. (2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
( 1) - Determine cause and correct prior to repair or
replacement of socket.
( 2) - Determine cause and correct prior to repair or
replacement of part.









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BULBS AND LEDS
NOTE: Copied from Electrical UIGs and modified. Does not
include soldered-in components.
BULB AND LED INSPECTION









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Condition Code Procedure
Application incorrect ... B ........ ( 1) Require replacement.
Base burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Base burned, not affecting
performance ............ 2 .............. ( 2) Suggest repair
or replacement.
Base corroded, affecting
performance ............ A .. Require repair or replacement.
Base corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Base loose, affecting
performance ............ B .. Require repair or replacement.
Base loose, not affecting
performance ............ 1 .. Suggest repair or replacement.
Burned out .............. A ............ Require replacement.
Intermittent ............ A ............ Require replacement.
Missing ................. C ............ Require replacement.
Seized in socket ........ A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .............. ( 2) Suggest repair
or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.

Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
(1) - Application incorrect includes wrong bulb coating
or color.
( 2) - Determine cause and correct prior to repair or
replacement of part.









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CALIPER HARDWARE
CALIPER HARDWARE INSPECTION








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Condition Code Procedure
Bent ................... A .. Require repair or replacement.
Broken .................. A .. Require repair or replacement.
Corroded, affecting
performance ............ A .. Require repair or replacement.
Dust boots on slider pin
(bolt) missing ......... C ... Require replacement of boots.
Dust boots on slider pin
(bolt) torn ............ A ... Require replacement of boots.
Missing ................. C ............ Require replacement.
Shim bent ............... A ............. ( 1) Require removal
or replacement.
Shim (OE standard)
missing ................ C ........ ( 2) Require replacement.
Shim out of position .... B ............. ( 1) Require removal
or replacement.
Shim worn ............... A ............. ( 1) Require removal
or replacement.
Slider pin (bolt) bent .. B ... Require replacement of slider
pin or bolt and lubricants.
Slider pin (bolt)
rust-pitted ............ A ... Require replacement of slider
pin or bolt and lubricants.
Slider pin (bolt) worn .. A ... Require replacement of slider
pin or bolt and lubricants.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Worn, affecting
performance ............ A ............ Require replacement.
( 1) - Removal is acceptable if shim is not OE.
( 2) - Aftermarket shims may be suggested to reduce noise.









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CALIPERS
You are not required to replace or rebuild calipers in axle
sets. However, when replacing or rebuilding a caliper due to the
conditions that follow, you may suggest servicing, rebuilding, or
replacement of the other caliper (on the same axle) for improved
performance and preventive maintenance (for example, the part is close
to the end of its useful life, replacing the caliper may extend pad
life, or contribute to more balanced braking).
CAUTION: When installing loaded calipers, it is required that
friction material be matched in axle sets for consistent
braking characteristics.

CALIPER INSPECTION








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Condition Code Procedure
Bleeder port damaged .... A ... Require repair or replacement
of caliper.
Bleeder screw broken off
in caliper ............. A ........... (1) Require repair or
replacement of caliper.
Bleeder screw plugged ... A ........... ( 1) Require repair or
replacement of bleeder screw.
Bleeder screw seized .... A ......... ( 2) Require replacement
of caliper.
Casting corroded,
affecting structural
integrity .............. A ............ Require replacement.
Casting damaged, affecting
structural integrity ... A ............ Require replacement.
Dust boot around caliper
torn ................... A ..... Require replacement of dust
boot.
Leaking ................. A .. Require repair or replacement.
Mounting pin threads
damaged ................ A ... Require repair or replacement
of component with damaged
threads.
Mounting pin threads
stripped in caliper
bracket (threads
missing) ............... A ... Require repair or replacement
of caliper bracket.
Mounting pin threads
stripped in steering
knuckle (threads
missing) ............... A ... Require repair or replacement
of steering knuckle.
Mounting pin threads
stripped (threads
missing) ............... A ... Require repair or replacement
of component with stripped
threads.
Parking brake cable
support, lever, or return
spring bent ............ A ... Require replacement of parts.
Parking brake cable
support, lever, or return
spring broken .......... A ... Require replacement of parts.
Parking brake mechanism in
caliper inoperative .... A .. Require repair or replacement.
Piston corroded (pitted
or peeling chrome
plating) ............... B ... Require replacement of piston
and rebuilding or replacement
of caliper.
Piston damaged, affecting
performance ............ B ... Require replacement of piston
and rebuilding or replacement
of caliper.
Piston damaged, not
affecting performance .. .. ........ No service suggested or
required.
Piston finish worn off .. B ... Require replacement of piston
and rebuilding or replacement

of caliper.
Piston sticking ......... A ........... Require rebuilding or
replacement of caliper.
Slide mechanism
sticking ............... A ... Require repair or replacement
of slide mechanism.
(1) - Only required if the hydraulic system must be opened.
( 2) - Seized is defined as a bleeder screw that cannot be
removed after a practical attempt at removing. Only
required if the hydraulic system must be opened.









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CONTROLLERS
See ELECTRONIC CONTROLLERS .
DIGITAL RATIO AXLE CONTROLLERS AND BUFFERS (DRAC AND DRAB)
DIGITAL RATIO AXLE CONTROLLER AND BUFFER INSPECTION








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Condition Code Procedure
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A ........ ( 1) Require replacement.
Connector missing ....... C ............ Require replacement.
Missing ................. C ............ Require replacement.
Output signal incorrect . B .. Require repair or replacement.
Terminal burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
( 1) - Determine cause and correct prior to replacement of part.
( 2) - Determine cause and correct prior to repair or
replacement of part.









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DISABLE SWITCHES
See SWITCHES.
DRUMS
Determine the need to recondition based upon individual drum
conditions that follow. Friction material replacement does not require
drum reconditioning unless other justifications exist. DO NOT
recondition new drums unless they are being pressed or bolted onto an
existing hub. It is not necessary to replace drums in axle sets.
However, when replacing or reconditioning a drum due to the conditions
that follow, you may suggest reconditioning of the other drum on the

same axle to eliminate uneven braking behavior. Always wash drums
after servicing or before installing.
DRUM INSPECTION









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Condition Code Procedure
Balance weight missing .. .. ........ No service suggested or
required.
Bell-mouthed, affecting
performance ............ A ....... Require reconditioning or
replacement.
Cooling fin broken ...... .. ........ No service suggested or
required.
Cracked ................. B ............ Require replacement.
Drum diameter is greater
than OEM "machine to"
specifications but less
than "discard at"
specifications, and the
drum does not require
reconditioning ......... 1 ........ (1) Suggest replacement.
Drum diameter will exceed
OEM "machine to"
specifications after
required
reconditioning ......... B ........ ( 2) Require replacement.
Hard-spotted ............ 2 ....... Suggest reconditioning or
replacement.
Measured diameter is
greater than OEM discard
specifications ......... B ............ Require replacement.
Out-of-round (runout),
affecting performance .. A ....... Require reconditioning or
replacement.
Out-of-round (runout),
exceeding manufacturer's
specifications ......... B ....... Require reconditioning or
replacement.
Scored .................. B ....... Require reconditioning or
replacement.
Surface threaded due to
improper machining ..... B ....... Require reconditioning or
replacement.
Tapered, affecting
performance ............ A ....... Require reconditioning or
replacement.
( 1) - Only applies to vehicles for which OEM "machine to"
specifications exist. If OEM does not supply "machine to"
specifications, the drum may be worn to discard
specifications.
( 2) - If OEM does not supply "machine to" specifications, you
may machine to discard specifications.









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ELECTRICAL PUMPS AND MOTORS
Copied fuel pump conditions from engine UIGs & deleted
pulsator from leaking conditions.
ELECTRICAL PUMP AND MOTOR INSPECTION









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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A .............. (1) Require repair
or replacement.
Connector missing ....... C ............ Require replacement.
Contaminated ............ A ........ ( 2) Require replacement.
Inoperative ............. A .............. ( 3) Require repair
or replacement.
Leaking externally ...... A .. Require repair or replacement.
Leaking internally ...... A .. Require repair or replacement.
Noisy ................... 2 .. Suggest repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A .............. ( 1) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Wire lead conductors
exposed ................ B .. Require repair or replacement.
Wire lead corroded ...... A .. Require repair or replacement.
Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
( 1) - Determine cause and correct prior to repair or replacement
of part.
( 2) - Determine source of contamination. Require repair or
replacement.
( 3) - Inoperative includes intermittent operation or out of OEM
specifications.









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ELECTRONIC CONTROLLERS
ELECTRONIC CONTROLLER INSPECTION








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Condition Code Procedure
Application incorrect ... B ............ Require replacement.
Attaching hardware
missing ................ C .......... Require replacement of

hardware.
Attaching hardware threads
damaged ................ A ... Require repair or replacement
of hardware.
Attaching hardware threads
stripped (threads
missing) ............... A ... Require repair or replacement
of hardware.
Code set (if
applicable) ............ A .......... (1) Further inspection
required.
Connector broken ........ A .. Require repair or replacement.
Connector melted ........ A ........... ( 2) Require repair or
replacement.
Connector missing ....... A ................. Require repair.
Contaminated ............ A .. Require repair or replacement.
Inoperative ............. B .. Require repair or replacement.
( 3) Further inspection required.
Leaking ................. A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A ........... ( 2) Require repair or
replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Wire lead conductors
exposed ................ B .. Require repair or replacement.
Wire lead corroded ...... A .. Require repair or replacement.
Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
( 1) - Refer to manufacturer's diagnostic trouble code procedure
and require repair or replacement of affected component(s).
( 2) - Determine cause and correct prior to repair or replacement
of part.
( 3) - Inoperative includes intermittent operation or out of OEM
specification. Some components may be serviceable. Check
for accepted cleaning procedure.









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FLUID
See BRAKE FLUID.
FLUID LEVEL SENSOR SWITCHES
See SWITCHES.
FOUR WHEEL DRIVE SWITCHES
See SWITCHES.