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
1992 GMC Magnavan 5.7 KSECTION Diagnostic Aids
If the engine is allowed to cool overnight, the 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 ECM TERMINAL & CIRCUIT WIRING ID (2.5L)
| Application | ECM Terminal | Wire Color |
|---|---|---|
| Signal | C12 | Tan |
| MAT Ground | D2 | Black/Red |
CODE 23 ECM TERMINAL & CIRCUIT WIRING ID (4.3L TURBO)
| Application | ECM Terminal | Wire Color |
|---|---|---|
| Signal | GF16 | Tan |
| MAT Ground | BB5 | 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 | ||||
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RENDER: 1.0x
NO RELATED
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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.