DTC Advanced Diagnostics: P034B (3.0L Engine)

DTC P034B:  Crankshaft Position (CKP) Sensor Direction Incorrect

General Description 

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

The crankshaft position (CKP) sensor consists of a rotor and a semiconductor that detects rotor position. When the engine starts, the rotor turns and the magnetic flux in the semiconductor device changes. The changes of magnetic flux are converted into pulsing signals to the powertrain control module (PCM). The CKP sensor detects injection/ignition timing for each cylinder and engine speed. At the timing of starter on, the PCM determines a backward of the crankshaft. If the PCM detects a backward rotation of the crankshaft during the ON of the starter, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	100 milliseconds or more
DTC Type	Two drive cycles, MIL on

Enable Conditions 

Condition
Starter	On

Malfunction Threshold 

The PCM detects a backward rotation of the crankshaft during the ON of the starter.

Possible Cause 

• CKP sensor failure

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.

Conditions for clearing the DTC 

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.