STEP 2. Measure the ground voltage at manifold absolute pressure sensor connector by backprobing.
(1) Do not disconnect the connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal MAPE line and ground by backprobing.- Voltage should be 0.5 volt or less.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage 0.5 volt or less?
Go to Step 5. Go to Step 3.