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by Bob O’Neill and Bob Lincoln
Code 54 is triggered if the logic module doesn’t sense a signal from the fuel injector sync pickup during engine rotation. When code 54 is triggered the power limited light is lit and for the 1985 models the logic module will guess the injector timing. For 1984, 1986 and later models the engine will not start. This signal will usually present during the starting of cranking of the engine.
Poor wiring or connection - Read the page ‘How to troubleshoot drivability issues’. Check the wiring and connections from the logic module to the power module. Clean and re-grease the connectors with dielectric grease. Check the wiring from the O2 sensor to the harness. If the signal wire is grounded it will cause code 54.
Defective Hall Effect Pickup (HEP) – On turbocharged cars there are two flat cables with three conductors. These come out of the distributor where the HEP is located. Ensure that these connectors are connected properly and check the cables as they cross under the distributor cap. Over time these can fail due to repeated cap replacement. This failure can present as broken cables.
When replacing the HEP be sure to tie up the cables to the shroud which covers the distributor so they don’t swing around causing another failure. Also be sure to check the path under the distributor cap to insure they are not pinched.
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