Powertrain Controls - ECM/PCM

DTC 82:

Ignition Wiring Schematic:

CIRCUIT DESCRIPTION
A 3X low resolution crankshaft position sensor is mounted in the block near a seven slot reluctor wheel fixed to the crankshaft. A voltage pulse is transmitted to the electronic Ignition Control Module (ICM) each time a slot in the wheel is aligned to the sensor. Six slots account for each cylinder with a seventh slot indicating a synchronizing pulse which allows the Powertrain Control Module (PCM) to determine correct crank position. These pulses directly control spark timing and enable the fuel injectors.

DIAGNOSTIC TROUBLE CODE (DTC) 82 WILL SET WHEN
If no 3X reference pulses are detected by the PCM during cranking, a DTC 82 will be set.

ACTION TAKEN (PCM) WILL DEFAULT TO
The engine will not start, a DTC 82 will be stored and the Malfunction Indicator Lamp (MIL) will remain illuminated.

DTC 82 WILL CLEAR WHEN
A current DTC 82 is cleared immediately after key "OFF," or when the engine is running. A History DTC 82 will clear after 50 consecutive ignition key cycles without a current DTC 82 being stored.

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

1. This test will determine if the 12 volts supply and a good ground is available at the electronic ignition control module.
2. Checks for continuity of the crankshaft position sensor and connections.
3. Voltage will vary in this test depending on cranking speed of engine.

DIAGNOSTIC AIDS
An open or shorted 3X signal will cause a "Cranks But Won't Run" condition. An intermittent connection however may set a DTC 82 and then disappear when a connection is made. A History DTC 82 may indicate poor terminal connections, a marginally faulty sensor or a marginal electronic ICM.