DTC 1-4-4

FC. Diagnostic trouble code (DTC) 1-4-4 DI EZ 116 K

* 1-4-4 No Load signal from fuel system.



DTC conditions:
The load signal is tested twice per revolution at part loads. The DTC 1-4-4 is logged if this signal is constantly high or low.

Fault causes:
- Open-circuit or short-circuit to ground in the cable between LH 2.4 #25 and EZ 116 K #8.
- LH 2.4 control module defective.
- Open-circuit in power supply to fuel injection system control module.

Fault symptoms:
Engine lacks power, stalls, does not start or runs jerkily.

FC1




Connecting the test box to DI EZ 116 K
Connect the test box to DI and check the GND point in accordance with P3-P4. P. Test Box, Signal Description
^ Continue with Checking the load signal in DI FC2.

FC2




Checking EZ 116 K load signal
- Connect engine control module (ECM) to breakout box.
- Install fuse 1 (or 31).
- Start engine and run up to operating temperature.
- Connect a voltmeter between #8 and #20 (ground).
The voltmeter should read approx. 370 mV when the engine is idling at operating temperature.

If reading is OK:
Intermittent fault.
^ Check the terminals for loose connections according to NA5. NA. Checking the Wiring
^ Try a new fuel injection relay.

If reading is incorrect:
^ Checking resistance of cable to ground FC3.

FC3




Checking the resistance to GND of the wiring
- Ignition off.
- Remove fuse 1 (or 31).
- Disconnect both control modules for MFI and DI.
Connect an ohmmeter between DI #8 and #20 (GND).
The ohmmeter should read infinite resistance.

If this value is OK:
^ Connect the test box to MFI FC4

If the reading deviates:
^ Check the wiring between control modules for grounding in accordance with NA3. NA. Checking the Wiring

FG4




Connecting the test box to MFI LH 2.4
Connect the test box to MFI and check the GND points in accordance with P1-P2. P. Test Box, Signal Description
^ Continue with Checking the load signal in MFI FC5.

FC5




Checking LH 2.4 load signal
- Connect the EZ 116 K control module.
- Connect the LH 2.4 control module to the breakout box.
- Install fuse 1 (or 31).
- Start engine.
Connect a voltmeter between #25 and #5 (ground).
The voltmeter should read approx. 370 mV when the engine is idling.

If reading is OK:
^ Check cable between control modules for an open-circuit according to NA2. NA. Checking the Wiring

If reading is incorrect:
^ Try a new LH 2.4 control module.