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Home >> Toyota >> 1994 >> Corolla Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Park/Neutral Switch Circuit
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Park/Neutral Switch Circuit

NOTE: Park/neutral switch may be referred to as Park/Neutral Position (PNP) switch.
  1. Check for diagnostic trouble codes while cranking the engine. See TESTS W/CODES article for accessing diagnostic trouble codes.
  2. With transmission/transaxle in Park, MIL should flash steady indicating normal operation. With transmission/transaxle in Drive, MIL should flash diagnostic trouble Code 51. This indicates park/neutral switch circuit is okay.
  3. If diagnostic trouble Code 51 exists with transmission/transaxle in Park and Drive, check wiring harness between park/neutral switch and Engine Control Module (ECM). See ECM LOCATION  table. If wiring harness is okay, substitute ECM with another ECM and recheck operation.
    ECM LOCATION

    Model Location
    Corolla Bottom Center Of Dash, In Front Of Console
  4. If normal operation is displayed by MIL with transmission/transaxle in Park and Drive, check park/neutral switch. See PARK/NEUTRAL SWITCH  under ENGINE SENSORS & SWITCHES. If park/neutral switch is okay, substitute ECM with another ECM and recheck operation. See ECM LOCATION  table.
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