DTC 2-1-4

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 is absent intermittently.

Causes of fault:
Damaged or scratched flywheel/drive plate. Loose contact in connections. Incorrectly installed RPM sensor. (Too large a gap between flywheel and 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 in accordance with NA7. NA. Checking the Wiring
^ 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 in accordance with NA7. NA. Checking the Wiring

FE2




Connecting the test box
- Connect the test box to DI and check the GND points in accordance with P3-P4. P. Test Box, Signal Description
^ Continue with Checking the RPM sensor signal FE3.

FE3




Checking the RPM sensor signal
- Connect the control module to the test box.
- Install fuse 1 (or 31).
Connect a voltmeter between #10 and #23.
- Operate the starter motor.
The voltmeter reading should be at least 500 mV 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 In accordance with NA5. NA. Checking the Wiring

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#17 and #20 (GND).
The voltmeter should read 7-8 V.

If the reading is OK
Intermittent fault.
^ Check the connections for contact resistance In accordance with NA6 and clean the RPM sensor connector In accordance with NA7. NA. Checking the Wiring

If the reading is incorrect
^ check that the drive plate/flywheel are flat 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 in accordance with NA7. NA. Checking the Wiring
^ Try using a new RPM sensor if no fault can be detected.