Fuel Pump — Checking on Engine [Toyota Carina T190]

Check the operation of the fuel pump. Short-circuit the "+B" and "FP" terminals of the diagnostic connector with a jumper.

b) Turn on the ignition

Warning: Do not start the engine.

c) Check for fuel pressure in the hose coming from the fuel filter.

Note: At this point, you can hear the noise of fuel flowing from the fuel differential pressure regulator into the return line.

Check the fuel pressure.

a) Make sure that the battery voltage is at least 12 V.

b) Disconnect the (-) cable from the battery.

c) Place a suitable container underneath (or put a rag) under the fuel manifold.

d) Slowly loosen the bypass bolt and disconnect the fuel pipe from the fuel manifold and remove the gaskets, disconnect the fuel inlet hose from the fuel pipe.







d) Using new gaskets and the bypass bolt, install the fuel inlet hose and pressure gauge onto the fuel pipe.

• Tightening torque - 30 Nm

e) Wipe up any spilled fuel.

g) Short-circuit the "FP" and "+B" terminals of the diagnostic connector with a jumper.

c) Connect the (-) cable to the battery.

i) Turn on the ignition.

k) Measure the fuel pressure at idle speed.

• Nominal fuel pressure - 2.75-3.15 kg/cm²

If the pressure is higher, replace the fuel pressure regulator.


If the pressure is lower, check:

• fuel hoses and their connections,
• fuel pump,
• fuel filter,
• fuel pressure regulator.

l) Remove the jumper from the diagnostic connector.

m) Start the engine.

n) Disconnect the vacuum hose from the fuel pressure regulator and plug it.







o) Measure the fuel pressure at idle.

• Nominal fuel pressure - 2.35 kg/cm²

p) Reconnect the vacuum hose to the regulator.

p) Stop the engine and check that the fuel pressure remains at least 1.5 kg/cm² for 5 minutes after the engine stops.

Otherwise, check the fuel pump, fuel pressure regulator and/or injectors.

c) After checking the fuel pressure, disconnect the (-) cable from the battery again. Carefully remove the pressure gauge, being careful not to splash fuel.

t) Using two new gaskets, connect the fuel inlet hose to the fuel pipe, tightening the bypass bolt.

Tightening torque:

• 4A-FE, 5A-FE, 4S-FE - 30 Nm

y) Connect the (-) cable to the battery.

f) Make sure there are no fuel leaks.