LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 1992 >> SC Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis >> Code Charts >> Code 31 - Transaxle Temperature Cold (Circuit Open) >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 31 - Transaxle Temperature Cold (Circuit Open): Description

PCM supplies a 5 volt signal to transaxle temperature sensor. As transaxle temperature increases, sensor value should decrease. PCM monitors the voltage change on an internal circuit. If engine is running for at least 3 1/2 minutes, and PCM detects a transaxle temperature less than -35°F (-37°C), PCM will set code 31.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This step checks if code 31 is still present. If "Scan" tool temperature reading is above -35°F (-37°C), problem is intermittent.
  2. This step duplicates conditions for code 32. If PCM does not set a code 32, go to next step. If PCM sets a code 32 and or "Scan" tool reads greater than 284°F (140°C), PCM and wiring are okay. If PCM and wiring are okay, replace sensor.
  3. This step also duplicates conditions for code 32. If PCM does not set code 32, Orange/Black wire is open or PCM is faulty. If Orange/Black wire is okay, replace PCM.
scientia non olet · About LEMON Manuals