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Author: Deluded Date: 07-24-03 23:44
READ CAREFULLY: The procedure to add IABs is different depending on how they are wired. One IAB wire will always run to the ECU, the other will run to either +12v or gnd. Choose the procedure to match how your car is wired! This is very important!
USDM ODB1 B18C: ( ECU sends ground, IAB wired to +12v )
IAB conversion... (this is for Manual cars only, but an AUTO USDM ECU converted to manual will have all the parts you need present)
Remove:
R135...11F0/1720 autos only
R150...1980/LS only
Add:
- Q17(A143)...already present on USDM auto 11F0/1720 (A5x, L5x, etc). Not present on EDM auto 11F0/1720 (G5x, etc).
- Q34(D1780 or C3225?)... already present on USDM auto 11F0/1720 (A5x, L5x, etc). Not present on EDM auto 11F0/1720 (G5x, etc). may use PCS trans: Q31(D1780)
- jumper from right hole of R135(trans side) to D13(arrow side)
- Jumper wire for OBD1 IAB control:
ODB2 & JDM B18C conversions: ( ECU sends +12v, IAB wired to GND )
- above procedure not needed...
Remove:
Q34
- cut control leg of IC15 short and solder signal carrying wire to it (thread wire through hole)and solder other 515 X High Side Switch pins in place
- solder other end of wire to control hole of q34.
- add C61 (1uF 35V tantalum cap) for 515 X High Side Switch.
- add Q17(A143)...already present on USDM auto 11F0/1720 (A5x, L5x, etc). Not present on EDM auto 11F0/1720 (G5x, etc).
Use P72 code with knock disabled .
Similar install on LS ecus.
Pin A19 will be your IAB output on the OBD1 harness.
- High side switch for OBD2 IAB control:
- High side switch for OBD2 IAB control:
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