944/968 Engine Swap Wiring
Changes
Years represent actual years used but should carry across all years for model range
|
Pin # |
968 (Ô93) |
944 (Õ86) |
944 S (Õ87) |
|
1 |
Ignition coil term 1 |
Ignition coil term 1 |
Ignitor term 5* |
|
2 |
DME relay term 87 |
DME relay term 87 |
DME relay term 87 |
|
3 |
DME relay term 87 |
DME relay term 87 |
DME relay term 87 |
|
4 |
Fuel pump |
Fuel pump |
Fuel pump |
|
5 |
DME relay term 85b |
DME relay term 85b |
DME relay term 85b |
|
6 |
Oil press. Gauge |
Oil press. Gauge |
Oil press. Gauge |
|
7 |
DME relay term 85 |
12V during starting (term 50 ign switch) |
Unused?? |
|
8 |
Water temp gauge |
Water temp gauge |
Water temp gauge |
|
9 |
Oil press idiot light |
Oil press idiot light |
Oil press idiot light |
|
10 |
Water temp idiot light |
Water temp idiot light |
Water temp idiot light |
|
11 |
Not used |
Not used |
Not used |
|
12 |
12 V fuse #7 |
Unused ? |
12 V from fuse #7 |
|
13 |
Not Used |
AC Compressor |
AC compressor |
|
14 |
Not Used |
Not used |
Ground for ignition coil wire (sheath of pin 1 wire) |
* This wire runs to the ignitor module on the 944S, this is not used with 968 motor, disconnect the ignitor plug (located behind left headlight on inner fender) pull back the rubber boot and splice the green wires together to send the DME signal straight to the coil.
As you can see for the ÔSÕ no wiring changes need to be made at the 14 pin connector located behind the brake booster. On the 944, obviously pin 7 must not have 12V since this is a ground signal sent from the 968 DME to 85 term of DME relay the 944 models have term 85 grounded directly, you donÕt want the wire on the 944 side of the connector hooked up or you will fry the DME, the S. It appears that you need to supply a 12V source on pin 12 on the normal 944.
(14 pin for 968 (smaller is tiptronic connector), 4 pin for 944 and 8 pin for 944 S
|
Pin # |
968 (Õ93) |
944 (Õ86) |
944S (Õ87) |
|
1 |
Not used |
Consumption Gauge |
Consumption Gauge |
|
2 |
Tach signal |
Tach Signal |
Tach signal |
|
3 |
AC signal to DME |
Not used (boost gauge) |
Not used (boost gauge) |
|
4 |
AC relay |
Not used (boost gauge) |
Not used (boost gauge) |
|
5 |
AC relay |
NA |
Not used |
|
6 |
Speedometer ?? |
NA |
Not used |
|
7 |
Switched 12V (from alarm) |
NA |
Diagnostic plug (12V) |
|
8 |
Oil level idiot light |
NA |
Oil level idiot light |
|
9 |
|
NA |
NA |
|
10 |
Diagnostic K lead |
NA |
NA |
|
11 |
Check engine light |
NA |
NA |
|
12 |
Diagnostic L lead |
NA |
NA |
|
13 |
Engine Knock |
NA |
NA |
|
14 |
Not used |
NA |
NA |
As you can see the change that needs to be made is to have a switched 12V supply to pin 7 on the 968 14 pin connector (the connectors arenÕt compatible so you will need to splice) on the 944S you can get this from pin 7 the 12V source for the diagnostic plug, in the 968 the signal comes from the factory alarm, if the alarm is tripped then no 12V and car doesnÕt run.
Disclaimer
Use this info at your own risk. The standard 944 info is done by extrapolation, the 944S info is based upon my notes from personal experience swapping a Ô93 968 engine into a Õ87 944S.
944 S2 Engine
Years represent actual years used but should carry across all years for model range
|
Pin # |
944S2(Ô90) |
944 (Õ86) |
944 S (Õ87) |
|
1 |
Ignitor term 5 |
Ignition coil term 1 |
Ignitor term 5 |
|
2 |
DME relay term 87 |
DME relay term 87 |
DME relay term 87 |
|
3 |
DME relay term 87 |
DME relay term 87 |
DME relay term 87 |
|
4 |
Fuel pump |
Fuel pump |
Fuel pump |
|
5 |
DME relay term 85b |
DME relay term 85b |
DME relay term 85b |
|
6 |
Oil press. Gauge |
Oil press. Gauge |
Oil press. Gauge |
|
7 |
unused |
12V during starting (term 50 ign switch) |
Unused?? |
|
8 |
Water temp gauge |
Water temp gauge |
Water temp gauge |
|
9 |
Oil press idiot light |
Oil press idiot light |
Oil press idiot light |
|
10 |
Water temp idiot light |
Water temp idiot light |
Water temp idiot light |
|
11 |
Not used |
Not used |
Not used |
|
12 |
12 V fuse #7 |
Unused ? |
12 V from fuse #7 |
|
13 |
AC Compressor |
AC Compressor |
AC compressor |
|
14 |
Ground for ignitor wire (sheath of pin 1 wire) |
Not used |
Ground for ignitor wire (sheath of pin 1 wire) |
(14 pin for 944 S2, 4 pin for 944 and 8 pin for 944 S
|
Pin # |
944S2 (Õ90) |
944 (Õ86) |
944S (Õ87) |
|
1 |
Not used |
Consumption Gauge |
Consumption Gauge |
|
2 |
Tach signal |
Tach Signal |
Tach signal |
|
3 |
Not used (boost gauge) |
Not used (boost gauge) |
Not used (boost gauge) |
|
4 |
Not used (boost gauge) |
Not used (boost gauge) |
Not used (boost gauge) |
|
5 |
12 V fuse 17 |
NA |
Not used |
|
6 |
unused |
NA |
Not used |
|
7 |
Unused |
NA |
Diagnostic plug (12V) |
|
8 |
Oil level idiot light |
NA |
Oil level idiot light |
|
9 |
Unused |
NA |
NA |
|
10 |
Diagnostic K lead |
NA |
NA |
|
11 |
Diagnosis Plug |
NA |
NA |
|
12 |
Diagnostic L lead |
NA |
NA |
|
13 |
Diagnostic plug |
NA |
NA |
|
14 |
Not used |
NA |
NA |
Installing an S2 engine into a non-S chassis is actually more difficult than the 968 engine. This is due to the fact the S2 still uses the ignitor circuit that must be integrated into the non-S chassis in order to get the motor to work. This wire is shielded running from the 14 pin connector to the ignitor and on the other side from the connector to the DME. This reason alone makes the 968 swap easier into a non-S chassis than the S2 motor.
In an S chassis it is a non-issue since you use the existing ignitor and itsÕ wiring. It appears that a 12V switched source is needed to pin 5 to power the DME similar to the 968 motor
Again this info is supplied only for reference, I have not personally performed the S2 motor swap.
Todd Holyoak 2003