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1988 Chevy Silverado

Tiny
RSAULS
  • MEMBER
  • 1988 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
Truck will not start and run with map sensor vacum hose pluged in. Replaced map and ecm. No change
Saturday, November 1st, 2008 AT 1:12 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What make you replaced the MAP -did you came up with DTC 33/34

Disconnect the MAP connector and the ECM-check wiring for short and open.


https://www.2carpros.com/forum/automotive_pictures/12900_map_7.jpg

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Thursday, September 3rd, 2020 AT 10:04 AM
Tiny
RSAULS
  • MEMBER
  • 2 POSTS
Yes im getting a 33 code. Im also getting 5 volt from wire connector at the map sensor on wires A and c witch is correct by the book. Then im getting 5 volts from A and B with key on and engine off, the book states that it should only have.5 volts on wires A and B. Why do I have 5 volts here? Is the book wrong or where can this voltage come from?
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Thursday, September 3rd, 2020 AT 10:04 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
DTC 33


https://www.2carpros.com/forum/automotive_pictures/12900_map_8.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_map1_3.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_map2_2.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_map3_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_33a_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_33b_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_33c_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_33d_1.jpg

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Thursday, September 3rd, 2020 AT 10:04 AM

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