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Home >> Saturn >> 1996 >> SW2 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1602 - Abs/Pcm Serial Data Communications >> Diagnostic Procedures
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Diagnostic Procedures

  1. Install scan tool. Check if scan tool can communicate with PCM. If scan tool communication is okay, go to next step. If scan tool does not communicate with PCM, perform On-Board Diagnostic (OBD) System Check. See OBD SYSTEM CHECK.
  2. Clear DTC. Unplug scan tool. Start and operate engine for about one minute. If DTC P1602 resets, go to next step. If DTC does not reset, problem is intermittent. See DIAGNOSTIC AIDS.
  3. Turn engine off. Disconnect ABS controller and PCM harness connector J1. Check continuity on circuit between ABS module harness connector terminal and PCM harness connector terminal. If continuity is present, go to next step. If continuity is not present, check for open in circuit.
  4. Check continuity between PCM terminals No. J1D08 and J1D09. If continuity is present, check for terminal tightness or faulty ABS controller. If continuity is not present, replace PCM.
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