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I have a 97 k1500 5.7. it idles fine, but when the accelrator is pushed it dies, troubleshooting leads me to the TPS, I have determined that I should be getting a 5vdc reference voltage at the TPS from the PCM. I am getting 1.0vdc. the next step in troubleshooting leads me to testing the wiring, and the correct voltage comming from the PCM. which plug and which pin on that plug should I be looking at?

Submitted: 212 days ago.

Category: Chevy

Value: $15

Status: AWAITING CUSTOMER ACTION

Here is the schematic for the IAC and engine computer wiring. The PCM plugs are labeled on the right side of the schematic.

Idle Air Control, Upshift Indicator, and Transfer Case Signals

View Full Image

Accepts:
Expert:	Dan
Pos. Feedback:	99.0 %
Answered:	4/26/2009

Auto Technician

GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified

212 days ago.

Reply

this diagram dosen't help me at all....I need to know where the TPS voltage comes from on the PCM... plus the link to the GM website says that I am not authorised to view.....

Posted by Dan 212 days ago.

Answer

Pins 13 and 14 appear to be the powers to the IAC. Connector 2 or the red connector contains these pins.

212 days ago.

Reply

i'm asking for the TPS pins your telling me the IAC...are we talking about the same thing?

Posted by Dan 211 days and 23 hours ago.

Answer

Sorry about that...I was totally confused. Ok, here are the TPS wires, locations and pins/connectors at the PCM.

MAP, IAT, TP, and ECT Sensors - 5.0, 5.7, 7.4L

View Full Image

211 days and 23 hours ago.

Reply

ok...so if i'm reading this right....i need conector 3 pin 12 for the 5vdc and connector 3 pin 4 for the ground..... which color is conector 3?

Posted by Dan 211 days and 23 hours ago.

Answer

Connector 3 is the clear connector. Here are the terminal positions.

View Full Image

View Full Image

Connector Part Information
• 12129025
• White C3 32 Pin Connector
Pin
Wire Color
Circuit No.
Function
Component Connector Cavity
DTC(s) Affected
Possible Symptoms From a Faulty Circuit
1
--
--
Not Used
--
--
--
2
--
--
Not Used
--
--
--
3
--
--
Not Used
--
--
--
4
BLK
452
ECT/TP Sensor Ground
--
--
High Idle
5
--
--
Not Used
--
--
--
6
RED/BLK
1228
PCS High
--
--
Poor Shift Quality
7
DK BLU/WHT
1231
Input Speed Sensor Low (8)
--
--
--
8
RED/BLK
1230
Input Speed Sensor High
--
--
--
9
WHT
423
IC Control
--
--
No Start
10
--
--
Not Used
--
--
--
11
RED
1226
Range Signal C (5)
--
--
Erratic Manual Downshifts
12
GRY
416
TP Sensor 5V Reference
--
--
Lack Of Power, Harsh Shifts
13
BRN/WHT
379
Clutch Signal (6)
--
--
AIR Pump Inop.
14
--
--
Not Used
--
--
--
15
BRN
1982
EVAP Canister Purge Diagnostic Vacuum Switch Signal
--
--
Purge Inop.
16
LT BLU/WHT
1229
PCS Low (5)
--
--
Poor Shift Quality
17
BLK/WHT
451
System Ground
--
--
--
18
BLK/WHT
BLK/WHT
Ground
--
--
--
19
BLK
470
IAT/MAP/EGR Sensor Ground
--
--
Idle Surge, Exhaust Odor
20
--
--
Not Used
--
--
--
21
ORN
440
Battery Feed
--
--
--
22
DK/BLU
1225
Range Signal B
--
--
Erratic Manual Downshifts
23
PNK
1224
Range Signal A
--
--
Erratic Manual Downshifts
24
--
--
Not Used
--
--
--
25
DK GRN/WHT
762
A/C Request Signal
--
--
--
26
--
--
Not Used
--
--
--
27
GRY
474
EGR/MAP 5V Reference
--
--
--
28
--
--
--
--
--
--
29
--
--
--
--
--
--
30
--
--
--
--
--
--
31
--
--
--
--
--
--
32
--
--
--

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Accepted Answer

Here is the schematic for the IAC and engine computer wiring. The PCM plugs are labeled on the right side of the schematic. Idle Air Control, Upshift Indicator, and Transfer Case Signals View Full Image

Idle Air Control, Upshift Indicator, and Transfer Case Signals

Reply

this diagram dosen't help me at all....I need to know where the TPS voltage comes from on the PCM... plus the link to the GM website says that I am not authorised to view.....

Answer

Pins 13 and 14 appear to be the powers to the IAC. Connector 2 or the red connector contains these pins.

Reply

i'm asking for the TPS pins your telling me the IAC...are we talking about the same thing?

Answer

Sorry about that...I was totally confused. Ok, here are the TPS wires, locations and pins/connectors at the PCM. MAP, IAT, TP, and ECT Sensors - 5.0, 5.7, 7.4L View Full Image

MAP, IAT, TP, and ECT Sensors - 5.0, 5.7, 7.4L

Reply

ok...so if i'm reading this right....i need conector 3 pin 12 for the 5vdc and connector 3 pin 4 for the ground..... which color is conector 3?

Answer

Related Chevy Questions

Here is the schematic for the IAC and engine computer wiring. The PCM plugs are labeled on the right side of the schematic.

Idle Air Control, Upshift Indicator, and Transfer Case Signals

View Full Image

Sorry about that...I was totally confused. Ok, here are the TPS wires, locations and pins/connectors at the PCM.

MAP, IAT, TP, and ECT Sensors - 5.0, 5.7, 7.4L

View Full Image