STEP 4. Check the sensor supply voltage at ECM connector by using power plant ECU check harness special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(2) Disconnect the fuel pump module connector.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal F/TM and ground.- Voltage should be between 4.5 and 4.9 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.5 and 4.9 volts?
Repair or replace the connector(s), or check and repair the harness of open circuit in F/TM line between fuel pump module connector and ECM connector. Then go to Step 7. Replace the ECM (Refer to Removal and Installation ). Then go to Step 7.