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ECA 64 - No Code (4TH Gear Switch)

  1. Check continuity across 4th gear switch terminals. Continuity should exist in 1st, 2nd and 3rd gear. Continuity should not exist in 4th gear. If continuity readings are not correct, replace 4th gear switch.
  2. Check continuity between 4th gear switch Black wire terminal and ground. If continuity does not exist, repair 4th gear switch ground circuit.
  3. Check for voltage at ECA terminal 1F. Voltage should read 0-2.5 volts when vehicle is in 1st, 2nd or 3rd gear. Voltage should read 12-13 volts when vehicle is in 4th gear. If voltage readings are not within specification, check for opens or shorts in wiring between 4th gear switch Light Green terminal and ECA terminal 1F. Repair as necessary. Go to ECA 67  .
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