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Home >> Acura >> 1994 >> Integra GS-R, 2D Coupe >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Trouble Codes >> Code 30 Or 31: TCM Signal "A" Or "B"

Code 30 Or 31: TCM Signal "A" Or "B"

  1. Turn ignition off. Remove BACK-UP fuse (7.5-amp) from underhood fuse/relay box for 10 seconds to reset ECM. Test drive vehicle for several miles (stop and go type driving). Check ECM for fault codes.
  2. If Code 30 or 31 is not present, problem is intermittent. Check for poor connections at ECM, Transmission Control Module (TCM) and wiring harness connectors.
  3. If Code 30 or 31 is present, turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A ) to ECM connectors, leaving ECM disconnected. See Figure. Disconnect 22-pin TCM connector. Check for continuity between test terminals B3 and body ground, and between terminals B4 and body ground. If continuity is present, repair short in Green/Blue (B3) wire or Gray (B4) wire between ECM B3 or B4 terminal and 22-pin TCM connector.
  4. If continuity is not present, check for continuity between Green/Blue (B3) wire or Gray (B4) wire between ECM B3 or B4 terminal and 22-pin TCM connector. If continuity is not present, repair open in Green/Blue (B3) or Gray (B4) wire between ECM and TCM. If continuity is present, replace ECM and retest.
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