2009 Suzuki LT-Z400 Service Manual (P/N 99500-43080-03E)

• Coverage and document identity: 2009 Suzuki LT-Z400K9 market codes E-19 (E.U.), E-28 (Canada), and E-33 (U.S.A.), effective frame No. JSAAK4AA92 100001-. Suzuki Motor Corporation Part No. 99500-43080-03E, March 2008; a 492-page PDF.
• Engine work includes removal and installation, top-side and bottom-side disassembly and assembly, cylinder-head and valve service, cam-chain timing, piston/crankshaft/balancer inspection, and dry-sump lubrication-system repair.
• Dealer mode and Suzuki Diagnosis System (SDS) coverage includes DTC retrieval and reset, saved trouble-condition data, fail-safe tables, ECM terminal identification, sensor testing, throttle-position adjustment, and fuel-pressure, injector, and pump diagnosis.
• Transmission and chassis procedures address gearbox and reverse-idler service, clutch removal and inspection, drive-chain cutting and joining, rear-axle bearing and seal work, wishbone and swingarm service, wheel hubs, and steering toe-out adjustment.
• Brake, cooling, starting, ignition, and charging chapters cover hydraulic bleeding, master-cylinder and caliper overhaul, parking-brake adjustment, radiator and water-pump repair, starter-drive service, generator testing, and regulator/rectifier checks.
• Diagram support includes the FI System Wiring Diagram, Terminal Alignment of ECM Coupler, Engine Lubrication System Chart Diagram, Cooling Circuit Diagram, front and rear brake-hose routing diagrams, and the main Wiring Harness Routing Diagram.

This is Suzuki's factory service manual for the fuel-injected 2009 LT-Z400K9 sport ATV, not an owner's handbook or a generic maintenance guide. Suzuki states that it is written for people with enough knowledge, skills, and equipment - including special tools - to service its vehicles, and material considered generally known is left out. It is therefore best suited to working mechanics and experienced owners with a properly equipped shop, rather than first-time mechanics learning internal repair work.

Engine and Fuel-Injection Repair

Mechanical coverage runs from engine removal and installation through complete top-side and bottom-side stripdown and assembly. Cylinder-head material includes valve-clearance service, camshaft and cam-chain-tensioner inspection, head disassembly, valve-guide replacement, and valve-seat repair. The lower-engine chapters address piston and ring inspection, connecting rod, crankshaft and balancer shaft, crankcase bearings and seals, plus the oil pump, sump filter, oil tank, hoses, and pipework.

The FI section goes well beyond a blink-code list. It explains user and dealer modes, current and past DTC handling, SDS reset procedures, and the "Show Data When Trouble" record of operating conditions for detected faults. Individual circuit trees cover crankshaft-position and throttle-position sensors, the injector, fuel-pump relay, and cooling-fan relay, with wiring checks and ECM pin references. Fuel-system repair adds pressure and delivery testing, pump and relay checks, injector cleaning, and fuel-tank, valve, filter, and delivery-pipe service.

Drivetrain, Suspension, and Brakes

Internal transmission coverage includes the countershaft, driveshaft, reverse idle gear, shift forks and cam, oil seals, bearings, gearshift linkage, reverse-lock cable, and gear-position switch. The clutch section documents lever and cable service, release-camshaft work, pack removal and installation, and inspection of the plates, springs, hub, and release components.

Chassis repair reaches the front double-wishbone assembly, rear swingarm and linkage, knuckles, hubs, axle housing, bearings, dust seals, chain, and sprockets. Brake chapters include front and rear master cylinders, calipers, pads, discs, hose replacement and routing, fluid-circuit bleeding, brake-light switches, and the parking-brake mechanism. Symptom tables for the engine, suspension, steering, brakes, transmission, clutch, charging, starting, and fuel systems help connect complaints to the appropriate factory test or repair section.

Specifications, Tools, and Scope

Service data includes maintenance schedules, component-specific torque tables, fluid and lubricant requirements, clearances, wear limits, electrical resistance and peak-voltage checks, and recommended Suzuki sealants and greases. Key tool callouts include SDS set 09904-41010, mode select switch 09930-82720, TPS test wire harness 09900-28630, crankcase separating tool 09920-13120, and drive-chain cutting and joining tool 09922-22711.

Emission-control coverage is limited to the crankcase-breather hose and oil-return tank; it is not a separate exhaust-emissions testing chapter. The manual also treats both front and rear shock absorbers as non-serviceable assemblies: it covers removal, inspection, adjustment, replacement, and disposal rather than internal shock rebuilding. The camshaft/automatic-decompression assembly is likewise identified as non-serviceable.

A specific engine repair caution prohibits driving the crankshaft into the crankcase with a mallet because crankshaft alignment can be compromised. The electrical precautions warn that reversed battery polarity or incorrect testing of a disconnected electronic unit can damage FI-system components, the ECM, or sensors. Fuel, brake, suspension, and electrical work should be performed with the vehicle secured and the manual's stated safety precautions, tools, and service materials.