how can i tell TII harness from S4/S5 ?
05-06-14, 07:48 AM
#2
Which specific harness do you need? Engine, front, emission...?
An S4 turbo emission harness has a Brown/Red wire which connects to the boost sensor. As this wire comes from the sensor it splits into two wires. One is for the ECU and the other is for the boost gauge.
On an S4 NA there is no boost gauge thus the Br/R wire goes straight to the ECU and does not have the split in this wire that the turbo version would have.
An S4 emission harness has 4 wires for the boost sensor while an S5 has 3 wires.
An S4 turbo emission harness has a Brown/Red wire which connects to the boost sensor. As this wire comes from the sensor it splits into two wires. One is for the ECU and the other is for the boost gauge.
On an S4 NA there is no boost gauge thus the Br/R wire goes straight to the ECU and does not have the split in this wire that the turbo version would have.
An S4 emission harness has 4 wires for the boost sensor while an S5 has 3 wires.
Last edited by satch; 05-06-14 at 08:05 AM.
05-06-14, 09:28 AM
#4
The wires found in the engine bay are the three harnesses mentioned above. In other words, there is not just one harness but a collection of different harnesses. So, it's not just called an engine harness as that is just one of the harnesses used.
Most of the wires found in the engine bay are part of the emission harness followed by the front harness and then the engine harness.
Most of the wires found in the engine bay are part of the emission harness followed by the front harness and then the engine harness.
Last edited by satch; 05-06-14 at 09:33 AM.
05-06-14, 10:37 AM
#5
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N326/7 is an S4 na, N332/3 is an S4 T2, n350 is an S5 na, and N370 is S5 t2.
if that doesn't work, step 2 is IDing S4 vs S5.
this is easy, the ecu connectors are different. the S5 has a round AFM plug S4 is square. the S5 TPS is 6 wires the S4 is three, S5 injectors are oval S4 is square.
id'ing turbo vs NA is harder
the S5 turbo vs NA are almost identical, the T2 has a knock sensor and blue boost control solenoid connector, while the NA has two extra emissions solenoids (brown and white maybe?)
the S4 is harder. the T2 should have a knock sensor connector on the same branch as the TPS. the injectors are also grouped differently, the NA has both primaries together and then the other branch is both secondaries, the T2 is rotor 1 and rotor 2.
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2nd Generation Specific (1986-1992)
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09-06-15 08:14 AM