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DTC P1530: Ignition Timing Adjustment Switch Circuit Malfunction

NOTE: Ignition timing is not adjustable on Esteem or Swift.
  1. Ensure test switch terminal of test connector (located in underhood relay/fuse block) is not grounded. See Fig 1 . If test switch terminal is grounded, remove jumper wire and retest system. If test switch terminal is not grounded, go to next step.
    Fig 1: Identifying Test Connector Terminals (Esteem)
    G98B12337Courtesy of SUZUKI OF AMERICA CORP.
  2. Turn ignition on. Measure voltage between test connector terminals No. 4 (ground) and No. 5 (test switch terminal). If reading is 10-14 volts, problem is intermittent or due to a faulty PCM. Go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If reading is not 10-14 volts, check Purple/White wire (Esteem) or Purple/Green wire (Swift) for short to ground. If wire is okay, replace PCM.
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