Turn the ignition switch to "OFF". | ||
↓ | ||
Remove the MAP sensor. Connect the vacuum gauge between the throttle body and the MAP sensor. Start the engine and measure the manifold absolute pressure at idle speed. ![]() Standard: 150-250 mm Hg | Out of range → | Check the hose installation. |
↓ | ||
Disconnect the vacuum gauge and install the MAP sensor.![]() | ||
↓ | ||
Disconnect the ECM connectors. Connect the test harness to the ECM connector. ![]() | ||
↓ | ||
Turn the ignition switch to "ON". Measure the voltage at the test harness terminals (page 5-9). ![]() Connection: B7 (+) - B1 (-) Standard: 2.7 - 3.1 V (760 mm Hg/1,013 kPa) | Out of range → | Faulty MAP sensor. |
↓ | ||
Voltage exists | ||
↓ | ||
Start the engine. Measure the voltage at the test harness terminals (page 5-9). ![]() Connection: B7 (+) - B1 (-) Standard: 2.7 V maximum | Out of range → | Faulty MAP sensor. |
↓ | ||
Voltage exists | ||
↓ | ||
Replace the ECM with a new one, and inspect it again. |