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Home >> Chevrolet >> 1998 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1652 - Fan 2 Relay Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition off. Disconnect PCM connector. Turn ignition on. Using DVOM, check voltage between ground and fan 2 relay driver circuit terminal at PCM connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step 6).
  3. Set ammeter to 10-amp range. Check current between ground and fan 2 relay driver circuit terminal at PCM connector. Monitor reading for a minimum of 2 minutes. If current is 0.1-1.5 amps, go to step 11). If current is not 0.1-1.5 amps, go to next step.
  4. Turn ignition off. Disconnect fan 2 relay connector. Turn ignition on, with engine off. Using DVOM, check voltage between ground and fan 2 relay driver circuit at fan 2 relay harness connector. If voltage is zero volts, go to step 10). If voltage is not zero volts, go to next step.
  5. Locate and repair short to voltage in fan 2 relay driver circuit. After repairs, go to step 16).
  6. Remove and inspect fuse for fan 2 relay. If fuse is blown, go to next step. If fuse is okay, go to step 8).
  7. Locate and repair short to ground in ignition feed circuit for fan 2 relay. Replace fuse. After repairs, go to step 16).
  8. Disconnect fan 2 relay. Turn ignition on. Measure voltage between ground and ignition feed circuit terminal at fan 2 relay harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step 13).
  9. Check for an open or short to ground in fan 2 relay driver circuit. Repair as necessary. After repairs, go to step 16). If circuit is okay, go to next step.
  10. Check fan 2 relay driver circuit and ignition feed circuit for poor terminal connection at fan 2 relay connector and at PCM connector. Repair as necessary. After repairs, go to step 16). If connections are okay, go to step 14).
  11. Turn ignition off. Reconnect PCM connector. Disconnect fan 2 relay connector. Turn ignition on. Connect a test light between fan 2 relay driver circuit and ignition feed circuit terminals at fan 2 relay harness connector. Using scan tool, select OUTPUTS TEST function and cycle fan 2 relay on and off. If test light flashes, see DIAGNOSTIC AIDS. If test light does not flash, go to next step.
  12. Check fan 2 relay driver circuit for poor terminal connection at PCM. Repair as necessary. After repairs, go to step 16). If connection is okay, go to step 15).
  13. Locate and repair open in ignition feed circuit to fan 2 relay. After repairs, go to step 16).
  14. Replace fan 2 relay. After replacing relay, go to step 16).
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  16. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P1652 until DTC P1652 test runs. If scan tool indicates FAILED THIS IGN, repeat step 2). If scan tool does not indicate FAILED THIS IGN, repair is complete.
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