Fuel Pump Operation Inspection
If simulation function of M-MDS is not used:
- Remove the fuel-filler cap.
- Switch the ignition to ON (engine off).
- Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound of the fuel pump is heard. (See
ON-BOARD DIAGNOSTIC TEST
).
- If no operation sound is heard, proceed to the next step.
- Measure the voltage at the wiring harness side fuel pump unit terminal B with the FP PID turned on.
- If the voltage is as specified, inspect the following:
- Fuel pump continuity
- Fuel pump ground
- Wiring harness between fuel pump relay and PCM terminal 1H
- If not as specified, inspect the following:
- Fuel pump relay
- Fuel pump speed control relay
- Wiring harness connector (Battery-Fuel pump relay-Fuel pump resister-Fuel pump unit-Ground)
Specification 8.0-11.5 V (Ignition switch at ON)
- If the voltage is as specified, inspect the following:
If simulation function of M-MDS is not used:
CAUTION:
- Connecting the wrong check connector terminal may possibly cause a malfunction. Carefully connect the specified terminal only.
- Short the check connector terminal F/P to body ground using a jumper wire.
- Remove the fuel-filler cap.
- Switch the ignition to ON (engine off).
- Verify that the fuel pump operation sound is heard.
- If no operation sound is heard, proceed to the next step.
- Measure the voltage at wiring harness side fuel pump unit connector terminal B.
- If the voltage is as specified, inspect the following:
- Fuel pump continuity
- Fuel pump ground
- Wiring harness between fuel pump relay and PCM terminal 1H
- If not as specified, inspect the following:
- Fuel pump relay (See RELAY INSPECTION ).
- Fuel pump speed control relay (See RELAY INSPECTION ).
- Wiring harness connector (Battery-Fuel pump relay-Fuel pump resister-Fuel pump unit-Ground)
Specification 8.0-11.5 V (Ignition switch at on)
- If the voltage is as specified, inspect the following: