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Test 8: A/T Control Problem

  1. Check label on ABS control unit. If A/T unit is installed in M/T vehicle, replace unit. If unit is correct for vehicle, go to next step.
  2. Turn ignition off. Disconnect Transmission Control Module (TCM) connectors. Disconnect ABS control unit connector. Check continuity between ABS control unit connector terminal No. 12 and ground. See Figure. If continuity does not exist, go to next step. If continuity exists, repair wiring.
  3. Check voltage at ABS control unit connector terminal No. 12. If voltage exists, repair wiring. If voltage does not exist, turn ignition on. Check voltage at ABS control unit connector terminal No. 12. If voltage exists, repair wiring. If voltage does not exist, go to next step.
  4. Turn ignition off. Reconnect TCM connectors. Turn ignition on. Check voltage between TCM 16-pin connector terminal No. 1 (+) and TCM 20-pin connector terminal No. 5 (-). See Fig 1. If battery voltage exists, go to next step. If battery voltage does not exist, check voltage at TCM 16-pin connector terminal No. 6 and TCM 20-pin connector terminal No. 1. If battery voltage exists, replace TCM. If battery voltage does not exist, repair wiring.
    Fig 1: TCM Connector Terminal Identification
    G96H20484Courtesy of SUBARU OF AMERICA, INC.
  5. Check voltage at ABS control module connector terminal No. 12 and No. 39. If battery voltage exists, go to next step. If battery voltage does not exist, repair wiring.
  6. Check TCM and ABS control module connectors. Clean contacts as needed. Go to next step.
  7. Reconnect all connectors. Erase memory. Recheck trouble codes. If same trouble code returns, replace ABS control unit. If other trouble codes exist, go to proper test procedure. If no trouble codes exist, problem was a temporary poor contact. Recheck harness and connectors.
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