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Home >> Suzuki >> 1998 >> Sidekick JS, 4D Utility, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - Aw03-72LE & Aw03-73LE >> Diagnostic Testing >> DTC P1875: 4WD "Lo" Switch Circuit Fault >> Testing
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DTC P1875: 4WD "Lo" Switch Circuit Fault: Testing

  1. Turn ignition switch to LOCK position. Disconnect PCM harness connector. Place transfer case gear selector in "2H" position. Using a DVOM, measure resistance between ground and PCM harness connector E173 terminal No. 3 on 1.6L or PCM harness connector E172 terminal No. 18 on 1.8L (Orange/White wire) while shifting transfer case gear selector from "2H" position to "4H" position, then to "N" position. If resistance is less than 2 ohms in specified positions, go to step  5 . If resistance is not as specified, go to next step.
  2. Place transfer case gear selector in "4L" position. Using a DVOM, measure resistance between ground and PCM harness connector E173 terminal No. 3 on 1.6L or PCM harness connector E172 terminal No. 18 on 1.8L (Orange/White wire). If resistance is less than 2 ohms, go to next step. If resistance is not as specified, go to step  6 .
  3. Inspect all harness connections for poor contact. Repair as necessary and retest system. If harness connections are okay, go to next step.
  4. Reconnect PCM harness connector. Clear DTC. See CLEARING TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Road test vehicle at 19 MPH with gear selector lever in "D" position and transfer case gear selector in 2WD range. Stop vehicle, place gear selector lever in "P" position and transfer case gear selector in "4L" position. Road test vehicle at 19 MPH with gear selector lever in "D" position for about 30 seconds. If DTC P1875 resets, repeat step  1 . If DTC resets for a second time, replace PCM. If DTC does not reset, fault is not present at this time. Check for an intermittent problem. See DIAGNOSTIC AIDS  .
  5. Disconnect 4WD "LO" switch harness connector. Using a DVOM, measure resistance between ground and PCM harness connector terminal No. 14 (Orange/White wire). If resistance is less than 2 ohms, repair Orange/White wire for a short to ground between PCM and 4WD "LO" switch. If resistance is not as specified, replace 4WD "LO" switch.
  6. Disconnect 4WD "LO" switch harness connector. Using a DVOM, measure resistance between 4WD "LO" switch harness connector terminal No. 1 (Orange/White wire) and PCM harness connector E173 terminal No. 3 on 1.6L or PCM harness connector E172 terminal No. 18 on 1.8L (Orange/White wire). If resistance is less than 2 ohms, replace 4WD "LO" switch. If resistance is not as specified, repair open in Orange/White wire between PCM and 4WD "LO" switch.
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