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.
1990 Isuzu Impulse AutomaticFACTORY OEM SERVICE PROCEDURE
Sensor Operating Specifications
COOLANT TEMPERATURE SENSOR RESISTANCE (AMIGO & PICKUP 2.3L)
| Condition | Ohms |
|---|---|
| Cold Engine | 70 |
| Warm Engine | 800 |
COOLANT TEMPERATURE SENSOR RESISTANCE (AMIGO, PICKUP & TROOPER 2.6L)
| Temperature °F (°C) | Ohms |
|---|---|
| 14 (-10) | 7000-12,000 |
| 50 (10) | 3000-5000 |
| 68 (20) | 2000-3000 |
| 122 (50) | 700-1000 |
| 176 (80) | 200-400 |
COOLANT TEMPERATURE SENSOR RESISTANCE (IMPULSE & TROOPER 2.8L)
| Temperature °F (°C) | Ohms |
|---|---|
| 0 (-18) | 25,000 |
| 20 (-7) | 13,500 |
| 40 (4) | 7500 |
| 70 (21) | 3400 |
| 100 (38) | 1800 |
| 160 (71) | 450 |
| 212 (100) | 185 |
EGR TEMPERATURE SENSOR RESISTANCE (AMIGO, PICKUP & TROOPER 2.6L, CALIF.)
| Temperature °F (°C) | Ohms |
|---|---|
| 32 (0) | 27,000 |
| 68 (20) | 12,100 |
| 109 (43) | 5900 |
| 176 (80) | 1700 |
| 212 (100) | 1000 |
MAP SENSOR VOLTAGE (TROOPER 2.8L)
| Altitude Feet | (1) Volts | ||
|---|---|---|---|
| Below 1000 | 3.8-5.5 | ||
| 1000-2000 | 3.6-5.3 | ||
| 2000-3000 | 3.5-5.1 | ||
| 3000-4000 | 3.3-5.0 | ||
| 4000-5000 | 3.2-4.8 | ||
| 5000-6000 | 3.0-4.6 | ||
| 6000-7000 | 2.9-4.5 | ||
| 7000-8000 | 2.8-4.3 | ||
| 8000-9000 | 2.6-4.2 | ||
|
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MAT SENSOR RESISTANCE (IMPULSE)
| Temperature °F (°C) | Ohms |
|---|---|
| 0 (-18) | 25,000 |
| 20 (-7) | 13,500 |
| 40 (4) | 7500 |
| 70 (21) | 3400 |
| 100 (38) | 1800 |
| 160 (71) | 450 |
| 212 (100) | 185 |
OXYGEN SENSOR VOLTAGE TEST
| Condition | Volts |
|---|---|
| Lean | .10 |
| Rich | 1.0 |
THROTTLE POSITION SENSOR VOLTAGE (TROOPER 2.8L)
| Position | Volts |
|---|---|
| Closed Throttle | .48 |
| Open Throttle | 4.5 |
NOTE:
For testing TPS on other models, refer to the appropriate SYSTEM/COMPONENT TESTS
article or the appropriate TESTS W/CODES
article in this section.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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