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Home >> Volvo >> 2000 >> V70 GLT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Turbo >> Diagnostic Tests >> P1560-P1562, P1660-P1663/ECM-928C: Control Module, Communication Problems >> Diagnostic Procedure
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Diagnostic Procedure

  1. If signal is too high, go to next step. If signal is too low, go to step  4. If signal is missing, go to step  5.
  2. This DTC means that Cruise On and Resume are both active at the same time. Replace cruise control lever with a known good unit. See REMOVAL & INSTALLATION in AIR BAG RESTRAINT SYSTEMS article. Go to next step.
  3. Verify repair when work is complete. Read out fault memory and check function of cruise control. If cruise control functions properly and DTC is no longer present, repair is complete.
  4. This DTC means that Cruise SET+ and SET- are both active at the same time. Replace cruise control stalk with a known good unit. See REMOVAL & INSTALLATION in AIR BAG RESTRAINT SYSTEMS article. Verify repair when work is complete. Read out fault memory and check function of cruise control. If cruise control functions properly and DTC is no longer present, repair is complete.
  5. Check cruise control electrical connectors for signs of damage, oxidation and loose connection. See CHECKING WIRING & CONNECTIONS .
  6. Connect breakout box. See CONNECTING & DISCONNECTING BREAKOUT BOX .
  7. Check signal cable between ECM terminal B47 (breakout box terminal B57) and cruise control lever terminal No. 1 for a short to ground. See Figure. Repair as necessary and go to next step.
    NOTE: With Cruise ON the voltage to cruise control lever is a square wave with maximum voltage of approximately battery voltage and is supplied via ECM terminal B47. At Cruise OFF the voltage to cruise control lever is a saw tooth wave with top voltage of approximately battery voltage and offset voltage of approximately 7.5 volts.
  8. Check signal cable between ECM terminal B33 (breakout box terminal B43) and cruise control lever terminal No. 2 for a short to ground. See Figure. Repair as necessary and go to next step.
  9. Check signal cable between ECM terminal B20 (breakout box terminal B30) and cruise control lever terminal No. 3 for a short to supply voltage. See Figure. Repair as necessary and go to next step.
  10. Check signal cable between ECM terminal B34 (breakout box terminal B44) and cruise control lever terminal No. 4 for a short to supply voltage. See Figure. Repair as necessary and go to next step.
  11. Check signal cable between ECM terminal B19 (breakout box terminal B29) and cruise control lever terminal No. 5 for an intermittent short to supply voltage. See Figure. Repair as necessary and go to next step.
  12. Disconnect breakout box when wiring repair is complete. See CONNECTING & DISCONNECTING BREAKOUT BOX . Verify repair. Ignition OFF. Ensure all components and connectors are installed correctly. Connect a scan tool and read out fault memory. Check for proper function of cruise control. If no DTCs are present and cruise control functions properly, repair is complete.
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