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 G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1366 (ENGINE CONTROLS AND FUEL - 4.4L - DTC P0010 TO DTC P0158)DTC P0069COMPONENT TEST
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Component Test
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Component Test
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
You must perform the Circuit/System Testing to verify the integrity of the sensor circuits before proceeding with the Component Testing.
Skew Sensor Test
- Ignition OFF, remove the vacuum source from the sensor.
- Ignition ON, observe and record the scan tool sensor pressure parameter. This is the first sensor reading.
- With the J 23738-A or the J 35555 , apply 5 in Hg (17 kPa) of vacuum to the sensor. See Special Tools . Observe and record the scan tool sensor pressure parameter. This is the second sensor reading.
- Subtract the second sensor reading from the first sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
- If the vacuum decrease is not within the specified range, replace the sensor
- With the J 23738-A or the J 35555 , apply 10 in Hg (34 kPa) of vacuum to the sensor. See Special Tools . Observe and record the scan tool sensor pressure parameter. This is the third sensor reading.
- Subtract the third sensor reading from the first sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
- If the vacuum decrease is not within the specified range, replace the sensor.
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 J 23738-A
or the J 35555
slowly apply vacuum to the sensor while monitoring the voltage on the DMM. See Special Tools
. 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.