1988 Jeep Cherokee Service & Repair Manual PDF

This service and repair manual brings together technical articles for the 1988 Jeep Cherokee XJ, with coverage of Comanche, Wagoneer and Wrangler YJ applications. Engine sections address the 2.5L TBI, 4.0L MPFI and 4.2L carbureted variants; individual procedures identify the models and equipment to which they apply.

Text search, bookmarks and wiring detail: Body text and tables are searchable, with 31 bookmarks linking to the main articles. Many diagram labels are outside the text search. Small wiring labels need magnification, and some diagnostic-connector numbers in the 2.5L diagram remain difficult to read when enlarged.

• Engine repair: Cylinder-head and manifold removal, timing-chain service, piston and bearing inspection, component specifications, torque tables and tightening-sequence diagrams.

• Fuel and ignition: CEC component tests for TBI and MPFI systems, fuel-pressure and delivery checks, sensor reference values and engine-control wiring.

• HVAC service: Evaporator-blower housing and heater-core removal, compressor oil checks, refrigerant-system diagnosis and servicing, plus control-component tests.

• AW4 electronic diagnosis: DRB-II fault-code testing, shift-solenoid and sensor checks, connector identification, circuit diagrams and post-repair verification.

• Brakes: Bleeding, disc and drum service, master-cylinder overhaul, parking-brake adjustment and Comanche height-sensing proportioning-valve procedures.

• Clutch and axles: Hydraulic-clutch service, differential overhaul, limited-slip clutch-pack work, pinion and bearing adjustments, plus driveshaft alignment.

• Electrical equipment: Alternator diagnosis, selected alternator overhaul procedures, Cruise Command testing, rear-window defogger diagnosis and power-door-lock checks.

Suited to mechanics comfortable with electrical measurements and drivetrain repair, including the use of fuel-pressure gauges and dedicated transmission diagnostic equipment.

Engine and Powertrain Documentation

Mechanical teardown coverage includes cylinder heads, valve gear, timing components and crankshaft bearings. Engine-identification codes and factory oversize/undersize markings distinguish component builds; specifications include valve dimensions, cylinder-head inspection limits, clearances, lubrication capacities and torque settings for main bearings, connecting rods and intake manifolds.

Manifold and cylinder-head tightening-sequence drawings accompany the installation sections. Engine removal and general overhaul are referred to separate articles outside this PDF, so the included mechanical sections are component-level repair references.

Cooling-system specifications and accessory-belt routing drawings round out the maintenance references.

CEC Fuel and Ignition Diagnostics

Computerized Engine Control (CEC) coverage separates the 2.5L throttle-body system from 4.0L multipoint injection. It explains ignition advance and idle-speed regulation, with tests for coolant-temperature, manifold-absolute-pressure and oxygen sensors; fuel-pressure and flow checks support diagnosis of delivery faults.

The 4.0L article provides component tests, but not a complete M.S.1700 system-tester diagnostic routine. The 2.5L idle-speed actuator removal warning explains how turning its mounting studs can pull the motor apart and dislodge internal components.

HVAC & Climate Control Servicing

HVAC sections cover evaporator housings, heater cores, expansion valves, receiver-driers and blower motors. Operating and inspection material also addresses temperature-control thermostats, blend-air doors and vacuum actuators.

Removal procedures distinguish the Wrangler housing from integrated heating and A/C assemblies.

Wrangler Evaporator Housing exploded views support component identification. Sanden SD508 five-cylinder oil-level drawings and York two-cylinder compressor dipstick drawings show the different compressor arrangements.

Altitude Pressure Variations and Altitude Vacuum Variations tables complement A/C System Operation charts, helping mechanics account for altitude when interpreting gauge readings. Refrigerant recovery, leak testing and evacuation procedures are included.

Pressurized fuel lines, R-12 refrigerant and heavy mechanical assemblies require the relevant service precautions and workshop equipment.

AW4 Transmission Troubleshooting

AW4 coverage centers on electronic fault isolation using DRB-II tests, transmission-controller connections and S1/S2/S3 solenoid circuits. Diagnostic flowcharts distinguish active faults from stored or intermittent problems and lead into post-repair checks.

Solenoid and control-component removal/installation are covered. AW4 coverage does not extend to a full internal transmission overhaul.

Brake and Clutch Repair

Brake sections include caliper, wheel-cylinder and master-cylinder overhaul, rotor inspection and parking-brake service. The master-cylinder article warns that honing a bearingized bore can cause premature failure of its rubber components.

The Comanche section addresses its height-sensing proportioning valve. Hydraulic-clutch procedures distinguish serviceable cylinders from the Wrangler's combined slave-cylinder/release-bearing assembly, which is replaced as a unit.

Axle and Driveshaft Service

Dana Trac-Lok and Power-Lok sections cover their different differential layouts and clutch-pack service. Drive-axle articles include pinion-depth, backlash and bearing-preload work; the general Dana axle and driveshaft chapters cover multiple applications, so their equipment lists should not be read as fitment for every Cherokee.

Charging and Body Electrical Tests

Delco 12SI/17SI articles include bench tests and overhaul; CS130 coverage is limited to on-vehicle checks. Cruise Command diagnostics, defogger-grid testing and door-lock circuits extend the electrical coverage beyond engine management.

PDF Sections and Included Reference Pages

One printable English PDF contains 434 pages total: 349 service/reference pages, a 10-page abbreviation glossary, 40 pages of A/C inspection guidelines, 33 pages of brake inspection guidelines, and two blank or nearly blank pages. The Motorist Assurance Program guidelines cover all makes and models; these reference sections are already included in the total.