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Home >> Suzuki >> 2002 >> Esteem GL, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 1.6L >> Diagnostic Tests >> DTC P1510: Engine Control Module Back-Up Power Supply Malfunction >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Backprobing at ECM, measure voltage between ground and ECM 26-pin harness connector C21 terminal No. 14 (White wire). See Figure . With ignition off, and with engine running, both readings should be 10-14 volts. If voltage readings are not as specified, go to next step. If voltage readings are as specified, go to step  3 .
  2. Repair open in White wire between engine compartment fuse/relay block DOME fuse (20-amp) and ECM harness connector C21 terminal No. 14 (White wire). After repair, repeat DTC CONFIRMATION TEST  .
  3. Turn ignition off. Turn ignition off. Disconnect ECM 26-pin harness connector C21. ECM is located under instrument panel, behind glove box. See Figure . Check for poor terminal contact at ECM harness connector. If poor terminal contact is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If terminal contact is okay, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If intermittent problem is not found, go to next step.
  4. Substitute a known good ECM, and repeat DTC CONFIRMATION TEST  . If DTC does not reset, testing is complete.
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