ICP problems
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4th Gear
Joined: Dec 2022
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ICP problems
I’ve had to replace multiple ICP sensors and pigtails. And still getting the same code p2285,rough idle abrupt turning off and chattering.
i’ve ran the wire and made sure there was no damage in any of the harnesses. But I have read that if I unplug the map sensor it will go off of default data ?
I unplugged the map sensor and the truck ran fine, then plugged it back in and it did the same thing p2285 and also p0237 for the map sensor. I cleared the codes and unplugged the map sensor again and truck ran fine.
Has my map sensor gone bad and that’s why I keep getting p2285 and can’t drive the truck or idle it ?
i’ve ran the wire and made sure there was no damage in any of the harnesses. But I have read that if I unplug the map sensor it will go off of default data ?
I unplugged the map sensor and the truck ran fine, then plugged it back in and it did the same thing p2285 and also p0237 for the map sensor. I cleared the codes and unplugged the map sensor again and truck ran fine.
Has my map sensor gone bad and that’s why I keep getting p2285 and can’t drive the truck or idle it ?
Fleet Owner
Joined: Nov 2003
Posts: 27,872
Likes: 3,592
I asked because your first post was in the 7.3L forum and an 03 can be either.
Can you explain what you mean by "you ran the wire?
Do you have a way to read your v-reference voltage (I assume you do since you are reading the codes)?
Can you explain what you mean by "you ran the wire?
Do you have a way to read your v-reference voltage (I assume you do since you are reading the codes)?
Fleet Owner
Joined: Nov 2003
Posts: 27,872
Likes: 3,592
That is going to make troubleshooting very hard.
That said, you can check the v-reference voltage (key on) with a DVOM
The MAP and ICP v-reference are from the same PCM supply.
The MAP and ICP signal return are on the same PCM ground.
You may have a bad MAP sensor and it could be corrupting the v-reference circuit or affecting the signal return (PCM ground). I suppose it could also be the MAP connector. Inspect that connector and post up what you see.
Do you have "backprobe pins"?
For the MAP sensor:
The brown wire with white stripe is the v-reference supply voltage (circuit 351) - connects to PCM plug C1381a, pin 45
The gray wire with red stripe is the common signal return (ground) (circuit 359) - connects to PCM plug C1381a, pin 33
The light green wire with the black stripe (middle wire) is the signal wire
C1381a is the left plug.
That said, you can check the v-reference voltage (key on) with a DVOM
The MAP and ICP v-reference are from the same PCM supply.
The MAP and ICP signal return are on the same PCM ground.
You may have a bad MAP sensor and it could be corrupting the v-reference circuit or affecting the signal return (PCM ground). I suppose it could also be the MAP connector. Inspect that connector and post up what you see.
Do you have "backprobe pins"?
For the MAP sensor:
The brown wire with white stripe is the v-reference supply voltage (circuit 351) - connects to PCM plug C1381a, pin 45
The gray wire with red stripe is the common signal return (ground) (circuit 359) - connects to PCM plug C1381a, pin 33
The light green wire with the black stripe (middle wire) is the signal wire
C1381a is the left plug.
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