DTC 19

DTC 19 Camshaft Position Reference Error:

Crankshaft Position Sensor:

***This article was updated by TSB No. 51-65-67***

CIRCUIT DESCRIPTION
The crankshaft position sensor is a hall effect type sensor that monitors crankshaft position and speed. There are four teeth 90° apart on the front of the crankshaft sprocket that induce a pulse in the sensor which is transmitted to the Powertrain Control Module (PCM).

DIAGNOSTIC TROUBLE CODE (DTC) 19 WILL SET WHEN
8 crankshaft position pulses missed for every cam reference pulse.

ACTION TAKEN (PCM will default to)
Backup fuel.

DTC 19 WILL CLEAR WHEN
The fault condition(s) no longer exists, and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step will determine if DTC 19 is the result of a hard failure or an intermittent condition.
2. This step checks the 5 volt reference.
3. This step checks the ground circuit.
4. This step checks the sensor and harness wiring.

DIAGNOSTIC AIDS
When PCM is in backup fuel, fast idle and poor performance exist.
Check for good connection at crankshaft position sensor and at PCM.