Ok here goes,
I get code 26 Quad Driver Module 1 Fault, whats this?

With the engine running in open loop i'm getting
1250 rpm
right and left 02 mv 300 - 700 going back and forth
122 r. BLM
134 l. BLM
ft cell 16
tps .62
L. BPW ms 4.9
R. BPW ms 4.5
iac position 45
map kpa 34
map v 1.28
baro kpa 103
spark advance 21-24
QDM Fault 1
Baro v 5.02

Can anyone make any sense of this?

 

The code 26 is from removing the Air pump. You need to have that code programmed out of the chip to turn of the check engine light...

-Rob

 

I never got a SES light before, Code 26 is "Evaporative Emission (EVAP) canister purge solenoid valve circuit" I thought that was on the passenger side on the manifold?

 

The 93 has the "oddball" Quad Driver codes:

DTC 26 = Quad Driver #1
DTC 27 = Quad Driver #2
DTC 28 = Quad Driver #3

The "quad driver" was a module used in the 3rd Gen and 93's to drive heavy current loads like solenoids. In 94, this capability was incorporated in the PCM.

I have always assumed that they correspond to the similar DTC codes on the 94 and later models, but I have never seen anyone actually confirm that this is the case. For the 94's:

DTC 26 = EEC canister purge solenoid
DTC 27 = EGR solenoid
DTC 28 = Transmission Range pressure switch fault
DTC 29 = AIR pump curcuit.

Logically, that would indicate the EEC purge solenoid you noted, but someone needs to confirm it. Yes, the purge solenoid is on the metal bracket about midway on the passenger side of the intake manifold.

 

Well, just so you know, on my 93 when I removed the air pump it set a code 26 so I'm pretty sure that's what it refers to. I disabled code 26 in the ECm and everything's been fine sine.

-Rob

 

ok, but i ditched the air pump last year and never had a problem ses