DTC 19

Code Chart 19 Crankshaft Position Sensor Circuit:

Crankshaft Position Sensor Wiring Circuit:

Circuit Description:
The Crankshaft Position (CKP) 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 (CKP) sensor leads are protected from outside "noise" by a shield which is grounded through the ECM.

DTC 19 Will Set When:
^ No 58X signal to ECM.
- Engine cranking for at least 10 seconds.
- At least 4.0 kPa drop in MAP.
- 1.0 drop in battery voltage.
^ Incorrect 58X signal to ECM.
- Engine running.
- ECM reads less than or greater than 58 teeth on crankshaft per revolution of engine.

Action Taken (ECM will default to): Malfunction Indicator Lamp (MIL) illuminates.

DTC 19 Will Clear When: The next ignition cycle is performed.

DTC Chart Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.
1. This determines if the ECM recognizes a problem. If it doesn't set DTC 19 at this point, the problem is intermittent.
2. This test checks harness and resistance of Crankshaft Position (CKP) sensor. Resistance may vary slightly with higher temperatures.
3. The Crankshaft Position (CKP) sensor output should measure about 2.5 volts at 340 cranking RPM.

Diagnostic Aids:
^ Faulty connections at either the CKP sensor connector or ECM connector can cause an intermittent DTC 19 to set.
^ Damage to CKP sensor harness shield may cause an intermittent DTC 19 to set.
^ Check for missing teeth, loose or damaged crankshaft reluctor wheel.