Powertrain Controls - ECM/PCM

Trouble Code 36 Chart:

Camshaft & Crankshaft Sensors Wiring Schematic:

CIRCUIT DESCRIPTION
The 24X Crankshaft Position (CKP) sensor is used to improve idle spark control at low engine speeds. The 24X CKP sensor is located behind the harmonic balancer on the front of the engine where it picks up pulses from a reluctor wheel on the crankshaft. Its signal is conditioned by the Powertrain Control Module (PCM) and used to more accurately control spark at lower engine speeds (under 1200 RPM) where spark control is critical for idle quality.

DIAGNOSTIC TROUBLE CODE (DTC) 36 WILL SET WHEN
The PCM determines that 6 or more consecutive 24X crankshaft position sensor reference pulses have not occurred. This test is executed once per ignition key cycle immediately after start-up.

ACTION TAKEN (PCM) WILL DEFAULT TO
The PCM will disregard the 24X sensor input and base timing from the 3X lo resolution CKP sensor. The Malfunction Indicator Lamp (MIL) will not become illuminated.

DTC 36 WILL CLEAR WHEN
A current DTC 36 will clear after each ignition key cycle. A History DTC 36 will clear after 50 consecutive ignition key cycles without a current DTC 36 being stored.

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

1. The 24X signal RPM should be the same as engine speed up to approximately 1200 RPM at which time it stops. This test determines if the PCM is putting out a 24X signal.
2. This test determines if signal voltage is present up to the PCM.
3. This will determine if 12 volts is present at the sensor input.
4. By applying 12 volts to the 24X crankshaft sensor pigtail circuit, pigtail and sensor integrity can be determined.
5. Ground path continuity is determined with this test.

DIAGNOSTIC AIDS
An intermittent 24X signal error can be caused by poor connections. Ignition feed, reference low and the signal circuits should all be checked for poor connections.