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 MANUALSGEO1993PRIZM L4-1600CC 1.6L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTRANSMISSION POSITION SENSOR/SWITCHADJUSTMENTS
1993 Geo Prizm L4-1600cc 1.6L DOHC
Transmission Position Sensor/Switch: Adjustments
1993 Geo Prizm L4-1600cc 1.6L DOHCSECTION Adjustments
1. Disconnect battery ground cable, then place shifter in Neutral position.
2. Raise and support vehicle.
3. Remove six splash shield bolts and splash shield.
4. Remove one nut, one lock washer and shift select cable from manual lever.
5. Disconnect PNP electrical connector.
6. Remove one nut, one lock washer and manual lever from manual shaft. Unstake lock plate behind manual shaft nut
7. Remove manual shaft nut and lock plate from PNP switch then PNP switch bolts and switch.
8. Reverse procedure to install noting the following:
a. Tighten manual shaft nut to 61 lb in
b. Adjust PNP switch by aligning neutral basic line scribed in PNP switch with groove in PNP switch sleeve.
c. Tighten PNP switch to 48 lb in.
d. Tighten manual lever nut to 106 lb in.
e. Adjust shift select cable by rotating manual lever counterclockwise until it reaches Park position. Rotate manual lever clockwise two detent positions until manual lever is in neutral position. Install shift select cable into manual lever and secure with cable nut Pull cable taut making sure no deflection exists.
f. Tighten shift select cable to 115 lb in.
g. Tighten left splash shield bolts to 44 lb in.
h. Tighten battery ground cable to 11 lb ft
9. Ensure proper operation of PNP switch by performing the following steps:
a. Apply parking brake and block wheels.
b. With shifter in PARK, verify starter operation, then stop engine and turn key to the RUN position.
c. Move shifter to Neutral, turn start engine and verify starter operation.
d. Verify that starter does not operate in Drive, 2nd, Low or Reverse.
2. Raise and support vehicle.
3. Remove six splash shield bolts and splash shield.
4. Remove one nut, one lock washer and shift select cable from manual lever.
Park/Neutral Position Switch:
5. Disconnect PNP electrical connector.
Manual Shaft Nut And Lock Plate:
6. Remove one nut, one lock washer and manual lever from manual shaft. Unstake lock plate behind manual shaft nut
7. Remove manual shaft nut and lock plate from PNP switch then PNP switch bolts and switch.
8. Reverse procedure to install noting the following:
a. Tighten manual shaft nut to 61 lb in
Park/Neutral Position (PNP) Switch Adjustment:
b. Adjust PNP switch by aligning neutral basic line scribed in PNP switch with groove in PNP switch sleeve.
c. Tighten PNP switch to 48 lb in.
d. Tighten manual lever nut to 106 lb in.
e. Adjust shift select cable by rotating manual lever counterclockwise until it reaches Park position. Rotate manual lever clockwise two detent positions until manual lever is in neutral position. Install shift select cable into manual lever and secure with cable nut Pull cable taut making sure no deflection exists.
f. Tighten shift select cable to 115 lb in.
g. Tighten left splash shield bolts to 44 lb in.
h. Tighten battery ground cable to 11 lb ft
9. Ensure proper operation of PNP switch by performing the following steps:
a. Apply parking brake and block wheels.
b. With shifter in PARK, verify starter operation, then stop engine and turn key to the RUN position.
c. Move shifter to Neutral, turn start engine and verify starter operation.
d. Verify that starter does not operate in Drive, 2nd, Low or Reverse.
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.