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.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 461 (ENGINE CONTROLS AND FUEL - 4.4L - DTC P0010 TO DTC P0158)DTC P006DCOMPONENT TEST
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Component Test
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Component Test
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
You must perform the Circuit/System Testing to verify the integrity of the sensor circuits before proceeding with the Component Testing.
Skewed Signal Test
- Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
- Ignition ON, engine OFF, observe the MAP sensor scan tool parameter.
- Use the observed MAP Sensor Scan Tool parameter that is closest to a value that is indicated in the first column.
THEN
- Using the J23738-A: Mityvac or the J 35555: Metal Mityvac to apply 5 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 17 kPa. The acceptable range is indicated in the second column.
- Using the J23738-A: Mityvac or the J 35555: Metal Mityvac to apply 10 in Hg of vacuum to the MAP sensor, the parameter in the first column should decrease by 34 kPa. The acceptable range is indicated in the third column.
| Ignition ON, Engine OFF, MAP Sensor Parameter | MAP Sensor Parameter With 5 Inches of Vacuum Applied | MAP Sensor Parameter With 10 Inches of Vacuum Applied |
|---|---|---|
| 100 kPa | 79-87 kPa | 62-70 kPa |
| 95 kPa | 74-82 kPa | 57-65 kPa |
| 90 kPa | 69-77 kPa | 52-60 kPa |
| 80 kPa | 59-67 kPa | 42-50 kPa |
| 70 kPa | 49-57 kPa | 32-40 kPa |
| 60 kPa | 39-47 kPa | 22-30 kPa |
Erratic Signal Test
- Ignition OFF, remove the sensor.
- Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the sensor.
- Install a jumper wire between the low reference circuit terminal A of the sensor and ground.
- Install a jumper wire at the terminal B of the sensor.
- Connect a DMM between the jumper wire from terminal B of the sensor and ground.
- Ignition ON, with the J23738-A:
Mityvac or the J 35555:
Metal Mityvac slowly apply vacuum to the sensor while monitoring the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.
- If the voltage is not within the specified range or is erratic, replace the affected sensor.
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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.