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 1893 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.3L - DTC P0016 TO DTC P0336)DTC P0106COMPONENT TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Component Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Component Testing
WARNING: This page is about a different car, the 2009 GMC Savana and 2009 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
Skewed Sensor Test
- Ignition OFF, remove the vacuum source from the MAP sensor.
- Ignition ON, observe and record the scan tool MAP sensor pressure parameter. This is the first MAP sensor reading.
- With the J 23738-A or J 35555 , apply 17 kPa (5 inches Hg ) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the second MAP sensor reading.
- Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 14 kPa (1 inch Hg) of the applied vacuum.
- If the vacuum decrease is not within the specified range, replace the MAP sensor.
- With the J 23738-A or J 35555 , apply 34 kPa (10 inches Hg) of vacuum tot he MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the third MAP sensor reading.
- Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 4 kPa (1 inch Hg) of the applied vacuum.
- If the vacuum decrease is not within the specified range, replace the MAP sensor.
Erratic Signal Test
- Ignition OFF, remove the MAP sensor.
- Install a 3A fused jumper wire between the 5-volt reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
- Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
- Install a jumper wire at terminal 3 of the MAP sensor.
- Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
- Ignition ON, with the J 23738-A
or J 35555
, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.
- If the voltage reading is erratic, replace the MAP 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.