P0564-S/C SWITCH #1 SIGNAL CIRCUIT PLAUSIBILITY





For a complete wiring diagram Refer to Section 8W


  • When Monitored:

    With the ignition switch on and no other S/C Switch DTC's present.

  • Set Condition:

    The S/C Switch #1 signal voltage is not within a valid switch signal range.


Possible Causes
 
SPEED CONTROL SWITCHES
 
S/C SWITCH SIGNAL CIRCUIT OPEN
 
S/C SWITCH SIGNAL CIRCUIT OPEN
 
S/C SWITCH SIGNAL CIRCUIT SHORT TO GROUND
 
S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
SENSOR GROUND OPEN
 
ENGINE CONTROL MODULE
 




Diagnostic Test

1.VERIFY S/C SWITCH SIGNAL CIRCUIT VOLTAGE



NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.


NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.







Select the appropriate voltage reading.

4.5 to 5.5 volts at both connectors.
  • Go To2


4.5 to 5.5 volts at only one connector.


Below 4.5 volts at both connectors.
  • Go To4


Above 5.5 volts for either measurement.
  • Go To6

2.SENSOR GROUND OPEN







Is the resistance below 10.0 ohms for each measurement?

Yes
  • Go To3


No

3.ECM - SENSOR GROUND OPEN







Does the scan tool display below 0.1 volt with the jumper wire connected?

Yes


No

4.S/C SWITCH #1 SIGNAL CIRCUIT OPEN







Is the resistance below 10.0 ohms for both measurements?

Yes
  • Go To5


No

5.S/C SWITCH #1 SIGNAL CIRCUIT SHORT TO GROUND





Is the resistance above 1000 ohms?

Yes


No

6.S/C SWITCH #1 SIGNAL CIRCUIT SHORTED TO VOLTAGE










Is the voltage above 1.0 volt?

Yes


No