Ignition Systems

by Michael Decipha Ponthieux
Date Posted: 2013-10-25
Last Updated: 2019-04-06

The following diagrams are the correct orientation and wiring for the TFI ignition.

Distributor Orientation
TFI Wiring
Distributor Differences

The following diagrams are for EDIS-8 Ignition Systems used on 8 cylinder engines.

EEC IV EDIS 8 Wiring
EDIS8 Connector
EDIS8 Diagram
EDIS8 Trigger
EDIS Tooth Pos

The following diagram is for converting TFI to EDIS-8

TFI to EDIS-8

The following diagram is for external TFI "DIS" ignition systems used on the 6 cylinder supercoupes.

DIS Diagram

The following diagrams are for 4 Cylinder engines using either DIS or EDIS ignitions.

4 cylinder ICM
EDIS-4

Special thanks to those whom have contributed photos and diagrams.

DIS Settings

For those whom are swapping to Distributorless DIS/External TFI (not EDIS) from TFI Distributor ignitions the following tune changes will need to be made:
PIDDescriptionNew ValueOld ValueComments
HP_HIDRESEDIS Module Present001=EDIS Module Present
HP_CIDCID Present10Cylinder ID Present
HP_CIDSELCID Sensor Type00Determines if hall effect or variable reluctance cam sensor is present
DPL_DHPDual Plug Ignition00Dermines if a dual plug ignition setup is present
IGN_TYPEIgnition Type000= TFI, 1= TFI w/ CCD (94-95), 2=Low Data Rate Distributorless Dual Plug, 3= LDRD Single Plug, 4=High Data Rate (EDIS)
MHPFDSignature PIP Duty Cycle Offset Constant0.990.20

Note: IGN_TYPE is not available in older ecu's such as the GUFB strategy. For GUFB use the CCDSW instead.
CCDSW; 1=enables CCD for non-push start TFI's and ICM's
Dwell scalars and functions will need to be updated as follows.

Dwell

PIDDescriptionBlack
CCD TFI		Grey
Push-Start		Comments
MINDLADwell Low Speed Max0.5000.500% PIP period
MINDLBDwell High Speed Max0.2000.200% PIP period
DWLTSWDwell Switch Point0.0200.020Sec change for max permitted dwell.
GUFB<<--GUFB Specific-->>
DWLTBPDwell High Coil Temp Threshold76Estimated Coil Temperature
DWLWFDwell Temp Blending Percentage0.8751 = ACT, 0 = ECT
CBAZA<<--CBAZA Specific-->>
DWELLADwell Base Adder5.813subtracted from vbat
DWELLMDwell Base Multiplier27.75multiplied by result of DWELLA
DWLMAXDwell Max0.0180Max msec to charge coil
DWLMINDwell Min0.0025Min msec to charge coil
DWL_XS_MINDwell FE Overcharge Time0.90min overcharge msecs allowed in falling edge dwell mode
VBAT_DWL_HYSDwell Adj Min Volt Thresholdmin vbat to enable the IDM for dwell corrections
VBAT_DWELLDwell Adj Max VoltThe max voltage the IDM is allowed to make dwell corrections



FN160A - Dwell Min Cold
VoltsmSec Non-CCDCCD
40962.872.80
152.872.80
143.073.00
124.104.00
104.614.50
04.614.50


FN160B - Dwell Min Hot
VoltsmSec Non-CCDCCD
40963.073.00
153.073.00
133.433.35
123.793.70
105.125.00
05.125.00

EDIS Settings

For those whom are swapping to EDIS from either DIS or TFI ignitions the following tune changes will need to be made:
PIDDescriptionNew ValueOld ValueComments
HP_HIDRESEDIS Module Present101=EDIS Module Present
HP_CIDCID Present10Cam Sensor Present
HP_CIDSELCID Sensor Type10Determines if hall effect or variable reluctance cam sensor is present
DPL_DHPDual Plug Ignition00Dermines if a dual plug ignition setup is present
IGN_TYPEIgnition Type40= TFI, 1= TFI w/ CCD (94-95), 2=Low Data Rate Distributorless Dual Plug, 3= LDRD Single Plug, 4=High Data Rate (EDIS)
MHPFDSignature PIP Duty Cycle Offset Constant0.990.20
Note: IGN_TYPE is not available in older ecu's such as the GUFB strategy.
At this time, it is only known that CZAJL, GUFB, CCAQA, CCAQE, and the CZAW0 strategy EEC-IV's support EDIS ignitions. This excludes the crown victoria and lincoln towncars that use unsupported strategies. CBAZA (94-95 mustang v8) does not support EDIS.

ECU / # Engine Cylinder - Swaps / Changes

For those whom are using ECU's for engines with fewer cylinders the follow tune changes must be made:
PIDDescriptionOld ValueNew ValueComments
NUMCYLNumber of Cylinders8 6 or 4May cause some pins to be reassigned
NUMOUTInjector Output Ports86 or 4
ENGCYLPips per Rev86 or 4
SARCHGEngine Size302Input your actual engine size or scaling percentage
NUMEGO# HEGOs Present22 or 1usually set to 1 for 4 cylinder engines
DEGPIPDegrees per PIP90120 or 180720 / # Cylinders
INJOUTInjectors per Output Port11This only changes if going to bank fire
FN1329Injector Firing OrderInput your actual firing order, or substituted order if using the FOX TO CBAZA SWAP WRITE UP
FN1327Injector Output Port MappingAll bank2 must be assigned to bank1 when numego is set to 1
MHPFDSignature PIP Duty Cycle Offset Constant0.208 cyl= 0.20, 6 cyl= 0.24, 4cyl= 0.29, No Signature PIP= 0.99
ENG_CONFIG_1Engine Configuration 168(#cylinders * 8 * # valves per cylinder); v6 = 50, v6 sohc = 66, v8 dohc= 68, 4cyl 2v = 34 - eec V only DIS_COP_HWCoil On Plug Ignition System Hardware0 -> COIL PACK, 1 -> COIL ON PLUG
**Verify SPKSWL and SPKSWH are equivalent so the falling edge of the ignition interrupt is always used.

Coil on Plug (CoP) and Coil Pack Swaps

The following applies to those whom are swapping from coil packs to coil on plugs, or coil on plugs to coil packs.
Firing Order1st2nd3rd4th5th6th7th8th
OuputABCDEFGH
ECU Pin#2652781041275379
v8-13726548Cyl #13726548
v8-15426378Cyl #15426378
v6-142536Cyl #123456


PIDDescriptionComments
DIS_COP_HWCoil On Plug Ignition System Hardware0 -> COIL PACK, 1 -> COIL ON PLUG


The Spark Plug Reference Table and an MBT Reference Chart are available in the PRE-TUNE INFORMATION.


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