Code 19, 58X Signal Fault: Notes

Permanent magnet, 3-wire crankshaft position sensor is located in side of engine block, .030-.070" from a 58-tooth reluctor wheel cast onto crankshaft. A 2-tooth gap in reluctor wheel allows ECM to determine a more absolute crankshaft position reference. As crankshaft rotates, an AC voltage signal is generated in windings of crankshaft position sensor. This signal is used by ECM to activate appropriate ignition coil driver and fuel injectors.

1. Code 19 will set if no 58X signal is received by ECM and engine has been cranking for at least 10 seconds, battery voltage has dropped by at least one volt and MAP signal has dropped. Code 19 will also set if engine is running and ECM senses more or less than 58 pulses from crankshaft reluctor ring during a single crankshaft revolution.
2. This test checks harness and resistance of crankshaft position sensor. Resistance may vary slightly with higher temperatures.
3. Crankshaft position sensor output should measure about 2.5 volts at 340 RPM.