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Home >> Infiniti >> 1993 >> G20 Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Code (DTC) Testing (G20) >> DTC 54: A/T CNTRL (A/T Serial No. 450021 & Later) >> Check Input Signal Circuit
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Check Input Signal Circuit

Turn ignition off. Disconnect ECM harness connector and A/T control unit harness connector. Verify harness continuity between ECM connector terminal No. 42 and A/T control unit connector terminal No. 10 (White/Red wire). Verify harness continuity between ECM connector terminal No. 44 and A/T control unit connector terminal No. 11 (White/Blue wire). See Fig 1 and Fig 2 . If continuity is present, perform FINAL CHECK  . If continuity is not present, check harness and connectors between ECM and A/T control unit. Repair harness or connectors as necessary and perform FINAL CHECK  .

Fig 1: Locating A/T Control Unit Connector
G93E79685Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC 54, Checking Input Signal Circuit
G93F79686Courtesy of NISSAN MOTOR CO., U.S.A.
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