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Home >> Volvo >> 1998 >> S70 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0530/EFI 225, DTC P0531/EFI 225, DTC P0532/EFI 225 & DTC P0533/EFI 225 (Non-Turbo) >> Diagnosis (Signal Too High, Permanent Fault)

Diagnosis (Signal Too High, Permanent Fault)

  1. Checking ground lead. Turn ignition off. Wait for approximately 150 seconds (cars with immobilizer 245 seconds). Disconnect the air conditioning (A/C) pressure sensor. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 1 and ground. The ohmmeter should read approximately 0 ohms. If ohmmeter reading is OK, go to step  3. If reading is NOT OK, go to step  2.
  2. Checking ECM connector. Turn ignition off. Air conditioning (A/C) pressure sensor disconnected. Check ECM connector for contact resistance and oxidation and repair as necessary. With ECM connected, connect an ohmmeter between air conditioning (A/C) pressure sensor connector 1 and ground. The ohmmeter should read approximately 0 ohms. If reading is OK, go to step  3. If reading is NOT OK, check A/C pressure sensor signal wire to ECM terminal No. B28 for an open circuit. After repair, go to step  6.
  3. Checking signal wire. Turn ignition on. Disconnect air conditioning (A/C) pressure sensor. Connect a voltmeter between air conditioning (A/C) pressure sensor connector 2 and ground. The voltmeter should read approximately 0 V. If reading is OK, go to step  4. If reading is NOT OK, check signal wire between A/C pressure sensor terminal 2 and ECM terminal No. B9 for an short circuit to supply voltage. After repair, go to step  6.
  4. Checking signal cable resistance. Turn ignition off. Disconnect air conditioning (A/C) pressure sensor. Connect an ohmmeter between air conditioning (A/C) pressure sensor connector 2 and ground. The ohmmeter should read approximately 10,000 ohms. If reading is OK, go to step  5. If reading is NOT OK, check wire between A/C pressure sensor terminal 2 and ECM terminal No. B9 for an open circuit. After repair, go to step  6.
  5. Checking the air conditioning (A/C) pressure sensor. Turn ignition off. Connect air conditioning (A/C) pressure sensor. Start the engine and idle it. Turn air conditioning (A/C) switch on. Turn blower fan on. Select Volvo Scan Tool, or aftermarket scan tool, to read off the value of the air conditioning (A/C) pressure sensor signal. Voltage should increase when the air conditioning (A/C) compressor starts. If reading is OK, cause of the DTC has been loose connections in the air conditioning (A/C) pressure sensor connector. Check connector for contact resistance and oxidation and remedy. Go to step  6. If reading is NOT OK, replace air conditioning (A/C) pressure sensor. Go to step  6.
  6. After carrying out the repair, check that the fault has been remedied. Turn ignition off. Air conditioning (A/C) pressure sensor and ECM should be connected. Start the engine and idle it. Air conditioning (A/C) switch on. Blower fan on. Wait until the A/C compressor has started. Select Volvo Scan Tool, or aftermarket scan tool, to read off DTCs. If EFI-225 is stored they should have intermittent status.
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