Crankshaft Position Sensor: Testing and Inspection

FE. DIAGNOSTIC TROUBLE CODE (DTC) 2-1-4 DI EZ 116 K

2-1-4 RPM sensor signal absent intermittently

DTC Conditions:

RPM sensor signal absent intermittently

Causes of fault:




Damaged or scratched flywheel/drive plate. Loose contact in connections. Incorrectly installed RPM sensor. (Too large a gap between RPM sensor and flywheel/drive plate).

Fault symptoms:

Engine will not start, engine overheating, engine running roughly.

FE1

Checking The RPM Sensor




-Ignition off.

Connect an ohmmeter between 1 and 2 on the RPM sensor.

RPM sensor 1 389 567-7 (early models):

The ohmmeter should read approx. 240 OHMS and a maximum of 400 OHMS when the engine is warm.

RPM sensor 3 547 847-8 (later models):

The ohmmeter should read approx. 170 OHMS and a maximum of 350 OHMS when the engine is warm.

If the reading is OK.

-Clean the RPM sensor connector and treat it for corrosion.

-Continue with Connecting the test box FE2.

If the reading deviates

-Try using a new RPM sensor.

-Clean the RPM sensor connector and treat it for corrosion.

FE2

Connecting The Test Box




-Connect the test box to DI and check the GND points in accordance with P3-P4.

FE3

Checking The RPM Sensor Signal

-Connect the control module to the test box.

-Re-install system fuse.





Connect a voltmeter between #10 and #23.

-Operate the starter motor.

The voltmeter reading should be at least 5OOmV AC.

If the reading is OK

-Check the engine speed signal FE4.

If the reading is incorrect

-Check the wiring between the RPM sensor and control module for loose contacts.

FE4

Checking The Engine Speed Signal From ICM To MFI Module




With the test box connected to the DI module connect a voltmeter between DI#1 7 and #20 (GND).

The voltmeter should read 7-8 V.

If the reading is OK

Intermittent fault.

-Check the connections for contact resistance and clean the RPM sensor connector.

If the reading is Incorrect

-Check that the drive plate/flywheel is true and not damaged in such a way that the RPM sensor sends a faulty signal. The drive plate is very susceptible to mechanical damage. Never use the drive plate to turn the engine or as a counterhold.

-Clean the RPM sensor connector.

-Try using a new RPM sensor if no fault can be detected.