DTC 3-1-2

EP. Diagnostic trouble code (DTC) 3-1-2 MFI LH 2.4

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.

EP1




Connecting the test box to DI EZ 116 K
- Ignition off.
- Remove fuse 1 (or 31).
- Connect the test box to DI.
^ Continue with Checking the signal from DI EP2.

EP2




Checking the signal from DI EZ 116 K
- Connect the control module.
- Put in fuse 1 (or 31).
- 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 EP3.

If the reading is 0 V:
^ Check the wiring between DI#4 and MFI#28 for grounding in accordance with NA3. NA. Checking the Wiring

EP3




Checking the wiring between DI EZ 116 K and MFI LH 2.4
- 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#28 for breaks in accordance with NA2. NA. Checking the Wiring

If the reading is incorrect:
^ Try using a new control module.