1998 Saturn SW1 AutomaticFACTORY OEM SERVICE PROCEDURE

Speedometer Inoperative

  1. If speedometer is inoperative, check internal power supply. Turn ignition on, engine off. Measure voltage (backprobe) between Black IPC 18-pin connector terminals "J" (Dark Green wire) and "K" (Black wire). If 7 volts or more exists, internal power supply is okay. Go to next step. If voltage is less than 7 volts, see procedures in INSTRUMENT CLUSTER RESISTANCE CHECK  .
  2. Turn ignition on. Using scan tool, observe status of SPEEDO FEEDBACK. If feedback status is high, go to step 4). If feedback status is not high, turn ignition off. Disconnect Light Blue PCM J1 32-pin connector. See COMPONENT LOCATIONS  table. Turn ignition on. Connect voltmeter between PCM harness connector terminal J1D06 (Dark Green wire) and ground.
  3. If battery voltage exists, check for good terminal contact at PCM connector. If battery voltage does not exist, turn ignition off. Reconnect PCM connector. Disconnect Black IPC connector. Connect fused jumper wire between IPC connector terminals "H" (Pink wire) and "J" (Dark Green wire). If SPEEDO FEEDBACK status is HIGH, see INSTRUMENT CLUSTER RESISTANCE CHECK  . If SPEEDO FEEDBACK status is not HIGH, repair open or short circuit to ground in Dark Green wire. If wire is okay, check for good terminal contact at PCM.
  4. Drive vehicle for a short distance and observe status of SPEEDO FEEDBACK. If status toggles between HIGH and LOW, see INSTRUMENT CLUSTER RESISTANCE CHECK  . If speedometer does not toggle between HIGH and LOW, disconnect Black IPC connector. If feedback status stays HIGH, check for short circuit to voltage in Dark Green wire. If circuit is okay, check for poor terminal contact at PCM. If feedback status does not stay HIGH, see INSTRUMENT CLUSTER RESISTANCE CHECK  .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.