Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Aids
1995 GMC Suburban K2500, 6.5 FSECTION Diagnostic Aids
WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
If engine is allowed to cool overnight, coolant and MAT sensors should read close to each other, when measured with a scan tester. A Code 23 will also result if signal and ground circuits become open.
CODE 23 TERMINAL & CIRCUIT WIRING IDENTIFICATION
| Application | PCM Terminal | Wire Color |
|---|---|---|
| IAT Sensor Signal | B9 | Tan |
| IAT Sensor Ground | B4 | Black |
| °F (°C) | Ohms | ||||
|---|---|---|---|---|---|
| 210 (100) | 185 | ||||
| 160 (70) | 450 | ||||
| 100 (38) | 1800 | ||||
| 70 (20) | 3400 | ||||
| 40 (4) | 7500 | ||||
| 20 (-7) | 13,500 | ||||
| 0 (-18) | 25,000 | ||||
| -40 (-40) | 100,700 | ||||
|
|||||
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.