bigalpha
Moderator
- Location
- Tucson, AZ
88 4.0L, 6cyl.
Where does the IAC and TPS ground at?
Where does the IAC and TPS ground at?
-
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Where does the IACV ground
- Thread starter bigalpha
- Start date
lawsoncl
NAXJA Forum User
- Location
- North Idaho
IAC doesn't have a ground, its a 4-wire stepper motor. FSM shows the TPS ground comes from the engine computer "sensor ground" on pin D3. Some folks have spliced in a ground at the TPS to the intake manifold. There is a ground at the dipstick tube that I recall connected to the ground on a whole bunch of stuff as well.
bigalpha
Moderator
- Location
- Tucson, AZ
Thanks, that's exactly what I needed to know.
The engine computer "sensor ground"; is that the ground on the engine block (by the dipstick and oil filter?)
The engine computer "sensor ground"; is that the ground on the engine block (by the dipstick and oil filter?)
bcmaxx
NAXJA Forum User
- Location
- The West Kootenays,B.C. Canada
yeah, like 4 wires come into one, i had constant idle probs after a motor swap and found a broken wire there. after supplying a new tps ground, it was a battle
bigalpha
Moderator
- Location
- Tucson, AZ
Well I just put in 5-90s neg batt cable and cleaned the ground and tested it (less than 4 ohms).
No wires were broken, but is it possible to still have a bad ground there?
No wires were broken, but is it possible to still have a bad ground there?
bcmaxx
NAXJA Forum User
- Location
- The West Kootenays,B.C. Canada
what are your symptoms sir?
lawsoncl
NAXJA Forum User
- Location
- North Idaho
The FSM doesn't show it, but I think they may get grounded there as well. I do recall a handful of black ground wires that are crimped and wrapped in duct tape in the wiring harness near there.
bcmaxx
NAXJA Forum User
- Location
- The West Kootenays,B.C. Canada
my broken wire was between the harness and the dipstick.
bigalpha
Moderator
- Location
- Tucson, AZ
bcmaxx - for your viewing pleasure, I present: Erratic idling
lawsoncl - there are a handful of grounding wires along with the Batt Neg cable that ground to a stud there. I'll double check the integrity of the grounding at the D3 pin. I've been through that shake and dance once already on the XJ.
lawsoncl - there are a handful of grounding wires along with the Batt Neg cable that ground to a stud there. I'll double check the integrity of the grounding at the D3 pin. I've been through that shake and dance once already on the XJ.
bcmaxx
NAXJA Forum User
- Location
- The West Kootenays,B.C. Canada
will it idle down when u unplug the iac and plug it back in? or leave it unplugged?
bigalpha
Moderator
- Location
- Tucson, AZ
Nope.