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DTC 541: Canister Purge Valve Signal

  1. Check status message on Volvo Scan Tool (998-8686 ). If fault is PERMANENT, SIGNAL TOO HIGH, go to next step. If fault is PERMANENT, SIGNAL TOO LOW, check for a short circuit to ground in wiring between CP valve terminal No. 2 and ECM connector terminal A39. Repair as necessary. If fault is PERMANENT, SIGNAL MISSING, go to step 3). If fault is INTERMITTENT, SIGNAL TOO HIGH, check for short to voltage in wiring between CP valve terminal No. 2 and ECM connector terminal A39. If fault is INTERMITTENT, SIGNAL TOO LOW, check for short to ground in wiring between CP valve terminal No. 2 and ECM connector terminal A39. Repair as necessary. If fault is INTERMITTENT, SIGNAL MISSING, go to step 8).
  2. Turn ignition off. Disconnect CP valve connector. Connect test light between CP valve connector terminal No. 2 and ground. If test light does not come on, replace CP valve. If test light comes on, check wiring between CP valve connector terminal No. 2 and ECM connector terminal A39 for a short circuit to voltage.
  3. Check for presence of other DTCs. If DTCs 445 and 447 are not present, go step 5). If DTCs 445 and 447 are present, check fuse No. 3. Replace fuse as necessary. If fuse is okay, go to next step. If fuse is not okay, check for short circuit to ground in wiring from fuse. Repair as necessary.
  4. Ensure ignition is on. Remove fuse No. 3. Connect voltmeter between fuse No. 3 rear connection and ground. If battery voltage is present, check for an open circuit in wiring between fuse No. 3 and CP valve terminal No. 2. If battery voltage is not present, check for an open circuit in wiring between fuse No. 3 and main relay terminal No. 3. Repair as necessary.
  5. Ensure ignition is off. Disconnect CP valve connector. Turn ignition on. Connect voltmeter between CP valve connector terminal No. 1 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check for open circuit in wiring between CP valve terminal No. 1 and main relay terminal No. 3.
  6. Ensure ignition is off. Connect ohmmeter between CP valve terminals No. 1 and 2. If ohmmeter reads about 22-30 ohms, go to next step. If ohmmeter does not read about 22-30 ohms, replace CP valve.
  7. Ensure ignition is off. Connect breakout box to ECM connector and check ground connections. See SYSTEM/COMPONENT TESTS article. Connect ECM to breakout box. Connect ohmmeter between breakout box pin No. 39 and CP valve connector terminal No. 2. If ohmmeter reads about zero ohms, cause of DTC was poor terminal contact at ECM and/or CP connector. If ohmmeter does not read about zero ohms, check for open circuit in wiring between CP valve terminal No. 2 and ECM connector terminal A39. Repair as necessary.
  8. If fault is INTERMITTENT, SIGNAL MISSING, check CP and/or ECM connector terminals for poor terminal contact. Also check for an intermittent open circuit in wiring between CP valve terminal No. 1 and main relay terminal No. 3, and between CP valve terminal No. 2 and ECM connector terminal A39. Repair as necessary.
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