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DTC P1705: A/T Gear Position Switch

NOTE: DTC P1705 indicates a short in A/T gear position switch circuit. DTC P1705 is caused when PCM receives 2 gear position input signals simultaneously. Possible causes include a short in A/T gear position switch wire or a faulty A/T gear position switch.
  1. Turn ignition on. While observing A/T gear position indicator, shift to each gear position separately. If any indicator stays on when shift lever is not in corresponding position, go to step 3). If indicators only come on when shift lever is in corresponding position, system is okay at this time. Check for poor connections or loose wires at wiring harness.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 3). No test procedures have been omitted.
  2. Shift to all positions except "R" position. Measure voltage between PCM 25-pin connector "B" terminal B16 and connector "A" terminal A9 or A22. See Figure . See the WIRING DIAGRAMS article. If battery voltage exists, go to next step . If battery voltage does not exist, check for short in wire between terminal B16 and A/T gear position switch or A/T gear position indicator. If wire is okay, check for loose terminals in PCM connectors. Repair as necessary. If connections and wire are okay, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
  3. Shift to all positions except "N" or "P" position. Measure voltage between PCM terminal B25 and terminal A9 or A22. See the WIRING DIAGRAMS article. If battery voltage (about 5 volts) exists, go to next step. If battery voltage (about 5 volts) does not exist, check for short in wire between terminal B25 and A/T gear position indicator or a short in wires between A/T gear position switch and A/T gear position indicator. If wire(s) is okay, check for loose terminals in PCM connectors. Repair as necessary. If connections and wire(s) are okay, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
  4. Shift to all positions except "D4" position. Measure voltage between PCM terminal B24 and terminal A9 or A22. See the WIRING DIAGRAMS article. If about 5 volts exists, go to next step. If about 5 volts does not exist check for a short in wire between terminal B24 and A/T gear position switch or A/T gear position indicator. If wire(s) is okay, check for loose terminals in PCM connectors. Repair as necessary. If connections and wires are okay, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
  5. Shift to all positions except "D3" position. Measure voltage between PCM terminal B8 and terminal A9 or A22. See the WIRING DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, check for short in wire between terminal B8 and A/T gear position switch or A/T gear position indicator. If wire is okay, check for loose terminals in PCM connectors. Repair as necessary. If connections and wire are okay, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
  6. Shift to all positions except "2" position. Measure voltage between PCM terminal B17 and terminal A9 or A22. See the WIRING DIAGRAMS article. If battery voltage exists, go to next step. If battery voltage does not exist, check for short in wire between terminal B17 and A/T gear position switch or A/T gear position indicator. If wire is okay, check for loose terminals in PCM connectors. Repair as necessary. If connections and wire are okay, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
  7. Shift to all positions except "1" position. Measure voltage between PCM terminal B18 and terminal A9 or A22. See the WIRING DIAGRAMS article. If battery voltage exists, check for poor connections or loose wires between at PCM connectors. If necessary, substitute a known good PCM, then recheck. If battery voltage does not exist, check for short in wire between terminal B18 and A/T gear position switch or A/T gear position indicator. If wire is okay, check for loose terminals in PCM connectors. Repair as necessary. If connections and wire are okay, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
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