Visual Inspection

Diagnosis of shift interlock system should begin with a general visual inspection. Each model is similar in function, but may be equipped with a variety of components depending upon application. Before beginning any diagnosis, refer to appropriate wiring diagram to become familiar with the type of system being diagnosed and for use as a guide to pinpoint areas of concern. See WIRING DIAGRAMS  .

Once familiar with system being diagnosed, check operation of the following:

• With ignition switch in LOCK position, gearshift lever should be locked in Park.
• With gearshift lever in Park, ignition switch should be allowed movement from LOCK position to any desired position and back to LOCK position. Ignition key should be removable while in LOCK position.
• With ignition switch in RUN position, gearshift lever should be allowed movement from Park. Models equipped with shift interlock solenoid require that brake pedal be depressed for this operation.
• With ignition switch in RUN position and gearshift lever in any position other than Park, ignition key is non-removable. Ignition key is removable only when gearshift lever is returned to Park.

If shift interlock system operates as specified, system is functioning properly at this time. If system does not operate as specified, inspect mechanical functions of the following:

• Ignition switch.
• Gearshift lever assembly.
• External shift cable/linkage.
• Internal transaxle/transmission shift linkage.

Adjust or repair as necessary. See ADJUSTMENTS  . If no mechanical problems are found, inspect all electrical components while referring to appropriate wiring diagram as a guide. See WIRING DIAGRAMS  . Ensure all electrical harness connections are tight and free of corrosion. Check for misrouted wires and damaged components. Ensure fuses are good and appropriate circuits are properly grounded.