DTC 19

Code Chart 19:

Crankshaft Sensor Circuit:

CIRCUIT DESCRIPTION:
The crankshaft position sensor (located in the engine block) is positioned directly in line with a 58 tooth crankshaft wheel. As the 58 tooth wheel (crankshaft) rotates, it generates a 58X signal to the ECM. This signal, once converted, is used by the ECM to activate the appropriate ignition coil driver and fuel injectors. The crankshaft position sensor leads are protected from outside noise by a shield which is grounded through the ECM.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Code 19 will set for the following conditions:

A. No 58X signal to ECM.
^ Engine cranking for at least 10 seconds.
^ At least 4.06 kPa drop in MAP.
^ 1.0 volt drop in battery voltage.
B. Incorrect 58X signal to ECM.
^ Engine running.
^ ECM reads less than or greater than 58 teeth on crankshaft.

2. This test checks harness and resistance of crankshaft position sensor. Resistance may vary slightly with higher temperatures.

3. The crankshaft position sensor output should measure about 2.5 volts at 340 cranking rpm.

DIAGNOSTIC AIDS:

^ Faulty connections at either the crankshaft sensor connector or ECM connector can cause an intermittent Code 19 to set.
^ Damage to crankshaft position sensor harness shield may cause an intermittent Code 19 to set.
^ Check for missing teeth or other damage to crankshaft reluctor wheel.