Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2002G20 L4-2.0L (SR20DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSA/T SHIFT LOCK SYSTEM
2002 Infiniti G20 L4-2.0L (SR20DE)
A/T Shift Lock System
2002 Infiniti G20 L4-2.0L (SR20DE)SECTION A/T Shift Lock System
Description
- The mechanical key interlock mechanism also operates as a shift lock:
With the key switch turned to ON, the selector lever cannot be shifted from "P" (parking) to any other position unless the brake pedal is depressed.
With the key removed, the selector lever cannot be shifted from "P" to any other position.
The key cannot be removed unless the selector lever is placed in "P".
- The shift lock and key interlock mechanisms are controlled by the ON-OFF operation of the shift lock solenoid and by the operation of the rotator and slider located inside the key cylinder.
Shift Lock System Electrical Parts Location
Wiring Diagram - SHIFT -
Diagnostic Procedure
SYMPTOM 1:
- Selector lever cannot be moved from "P" position with key in ON position and brake pedal applied.
- Selector lever can be moved from "P" position with key in ON position and brake pedal released.
- Selector lever can be moved from "P" position when key is removed from key cylinder.
SYMPTOM 2:
Ignition key cannot be removed when selector lever is set to "P" position. It can be removed when selector lever is set to any position except "P".
A/T DEVICE CHECK
1. Shift Lock Solenoid
- Check operation sound.
When ignition switch is turned to "ON" position and selector lever is set in "P" position.
2. Park Position Switch
- Check resistance between A/T device harness terminal 6 and 7.
STOP LAMP SWITCH
- Check continuity between terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal-refer to "BRAKE PEDAL AND BRACKET".
- The mechanical key interlock mechanism also operates as a shift lock:
With the key switch turned to ON, the selector lever cannot be shifted from "P" (parking) to any other position unless the brake pedal is depressed.
With the key removed, the selector lever cannot be shifted from "P" to any other position.
The key cannot be removed unless the selector lever is placed in "P".
- The shift lock and key interlock mechanisms are controlled by the ON-OFF operation of the shift lock solenoid and by the operation of the rotator and slider located inside the key cylinder.
Shift Lock System Electrical Parts Location
Wiring Diagram - SHIFT -
Diagnostic Procedure
SYMPTOM 1:
- Selector lever cannot be moved from "P" position with key in ON position and brake pedal applied.
- Selector lever can be moved from "P" position with key in ON position and brake pedal released.
- Selector lever can be moved from "P" position when key is removed from key cylinder.
SYMPTOM 2:
Ignition key cannot be removed when selector lever is set to "P" position. It can be removed when selector lever is set to any position except "P".
A/T DEVICE CHECK
1. Shift Lock Solenoid
- Check operation sound.
When ignition switch is turned to "ON" position and selector lever is set in "P" position.
2. Park Position Switch
- Check resistance between A/T device harness terminal 6 and 7.
STOP LAMP SWITCH
- Check continuity between terminals 1 and 2.
Check stop lamp switch after adjusting brake pedal-refer to "BRAKE PEDAL AND BRACKET".
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.