Uplander FWD V6-3.5L VIN L (2006)
control module, or a faulty control module.
8. Use a scan tool and observe the MAP sensor for less than 12 kPa.
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If the MAP sensor is more than 12 kPa then test the MAP sensor signal circuit for a short to voltage or a faulty control module.
9. Use a 3-amp fused jumper wire and connect it between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit.
10. Use a scan tool and observe the MAP sensor for more than 103 kPa.
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If the MAP sensor is less than 103 kPa, then test the MAP sensor signal circuit for a short to ground, an open, high resistance, or a faulty
control module.
11. Turn OFF the ignition and allow the control module to power down.
12. Remove the MAP sensor from the engine vacuum source. Leave the MAP sensor connected to the engine harness.
13. Connect a J 23738-A to the MAP sensor.
14. Turn ON the ignition, with the engine OFF.
15. Observe the MAP sensor pressure with the scan tool.
16. Apply vacuum to the MAP sensor with the J 23738-A in 1 inch Hg increments until 15 inches Hg is reached. Each 1 inch Hg should decrease
MAP sensor pressure by 3-4 kPa. Monitor the MAP sensor pressure to see if the decrease in pressure is consistent.
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If decrease in pressure is not consistent then, test for intermittent and poor connections at the MAP sensor. If connections test OK, replace the
MAP sensor
17. Apply vacuum with the J 23738-A until 20 inches Hg is reached. Observe the MAP sensor pressure for less than 34 kPa.
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If more than 34 kPa, test for an intermittent and for a poor connection at the MAP sensor. If connections test OK, replace the MAP sensor.
18. With a DMM measure for less than 5 ohms of resistance between the low reference circuit of the MAP sensor and battery negative post.
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If the resistance is more than 5 ohms, then test the low reference circuit for a high resistance or a faulty control module.
REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Manifold Absolute Pressure Sensor Replacement
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Control Module References See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and
Procedures
