Fuel pump control circuit check the following steps: 1, confirm the fuel pump circuit is fault â‘ ignition switch to turn off 10s. â‘¡ Ignition switch to turn on, but the engine does not run. â‘¢ listen to the action of the fuel pump. Fuel pump should be able to work 2s, if you can hear the fuel pump work 2s, said the fuel pump control circuit is normal. If you can not hear the fuel pump work, you should proceed to the next inspection. 2, check the fuel pump relay terminal 30 (harness side) to the line No. 30 circuit is faulty â‘ turn off the ignition switch. â‘¡ disassemble the fuel pump relay. â‘¢ Connect the other end of the well-grounded test lamp to the fuel pump relay terminal 30 (harness side). If the test light does not turn on, repair the circuit. If the test light turns on normally, the next step should be checked. 3, check the fuel pump relay terminal 85 and ECM terminal K54 circuit is faulty â‘ turn off the ignition switch. â‘¡ disconnect the fuel pump relay. â‘¢ Connect the other end of the test lamp with good grounding to the fuel pump relay 85 (harness side). If the test lamp does not turn on, disconnect the ECM harness and check if the circuit between the fuel pump relay terminal 85 and ECM terminal K54 is open. Circuit, should be circuit repair, if the circuit is not open, should be replaced ECM. If the test light to normal light 2, the next step should be checked. 4, check the fuel pump relay 86 and the ground circuit is faulty â‘ remove the fuel pump relay. â‘¡ Connect the other end of the test lamp that is connected to the positive terminal of the battery to the fuel pump relay terminal 86 (harness side). If the test light does not turn on, repair the circuit. If the test light turns on normally, the next step should be checked.
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