Fuel Injection

EQ. DIAGNOSTIC TROUBLE CODE (DTC) 3-1-2 MFI LH 2.4 AND LH 3.1

3-1-2 No knock enrichment signal from distributor ignition (DI) system

DTC Conditions:

When attempting to start the engine the DI system control module sends an ignition signal to terminals 1 and 28. This is to check that the wiring to terminal 28 is unbroken. A DTC is logged if the signal is missing.





Causes Of Fault:

Break or short circuit in the wiring between DI#4 and MFI#28.

Fault symptoms:

Normally no fault symptoms.

EQ1

Connecting The Test Box To DI EZ 116 K.

-Ignition off.

-Remove system fuse (in engine compartment (-90) or no. 6 (91-)).




-Connect the test box to DI.

-Continue with Checking the signal from DI EQ2.

EQ2

Checking The Signal From DI EZ 116 K.




-Connect the control module.

-Re-install system fuse.

-Ignition on.

Connect a voltmeter between #4 and #20.

The voltmeter should read approx. 600-900 mV.

If this value is OK:

-Continue with Checking the wiring between DI and MFI LH 2.4/LH 3.1 EQ3.

If the reading is 0 V:

-Check the wiring between DI#4 and MFI LH 2.4/LH 3.1 #28 for grounding.

EQ3

Checking The Wiring Between DI EZ 116 K And MFI LH 2.4/LH 3.1.




- Operate the starter motor and take readings from the voltmeter.

The voltmeter should read approx. 6 V.

If this value is OK:

-Check the wiring between DI#4 and MFI LH 2.4/LH 3.1 #28 for breaks.

If the reading is incorrect:

-Try using a new control module.