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DTC P1738/25: 2ND Clutch Pressure Switch

WARNING: This page is about a different car, the 1998 Honda Odyssey, 1998 Honda Accord, and 1998 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using scan tool, retrieve A/T freeze data. Clear fault codes and road test vehicle under same conditions freeze data was recorded. If fault code returns, go to next step. If fault code does not return, problem is intermittent, check transaxle and PCM connections.
  2. Turn ignition on. Measure voltage between 25-pin PCM harness connector "B", terminal No. 14 (Blue/Black wire) and terminals No. 20 or 22 (Brown/Black wires). See Figure . If battery voltage is present, go to next step. If battery voltage is not present, go to step 4)  .
  3. Turn ignition off. Disconnect 25-pin PCM harness connector "B". Check for continuity between ground and 25-pin PCM harness connector "B", terminal No. 14 (Blue/Black wire). If continuity is not present, replace PCM with a known-good unit and recheck. If continuity is present, repair short to ground in Blue/Black wire.
  4. Raise and support front of vehicle. Set parking brake and block rear wheels. Start engine and shift to "2" position. Run in "2" position for more than 5 minutes. Measure voltage between 25-pin PCM harness connector "B", terminal No. 14 (Blue/Black wire) and terminals No. 20 or 22 (Brown/Black wires). If voltage is about zero volts, check connections and replace PCM with a known-good unit as necessary. Recheck system. If voltage is not about zero volts, go to next step.
  5. Turn ignition off. Disconnect 2nd clutch pressure switch connector. See Figure . Turn ignition on. Measure voltage between ground and 2nd clutch pressure switch connector. If battery voltage is present, go to next step. If battery voltage is not present, repair open or short in Blue/Black wire between 25-pin PCM harness connector "B" and 2nd clutch pressure switch connector.
  6. Measure resistance between ground and 2nd clutch pressure switch connector. If resistance is 10 megohms or more, check for loose PCM or 2nd clutch pressure switch harness connectors. Replace PCM or 2nd clutch pressure switch with a known-good unit if necessary. If resistance is less than 10 megohms, replace 2nd clutch pressure switch.
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