Test TC-24A - Loss Of Flex Fuel Calibration Signal (DTC 64)
WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit & connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY . For wiring diagrams, see WIRING DIAGRAMS section. After each repair, perform TEST VER-2 .
NOTE:
Flex fuel sensor sends out a calibration signal for 1.5 seconds after ignition is turned on.
- Using DRB, read flex fuel sensor voltage during 1.5 second interval after ignition is turned on. If voltage is not 4.28-4.63 volts, go to step 5). If voltage is 4.28-4.63 volts, go to next step.
- Wiggle flex fuel sensor connector and harness while observing DRB display. Flex fuel sensor is located in trunk behind trunk liner on rear passenger seat lower crossmember. If flex fuel sensor voltage changes when flex fuel sensor connector and harness are wiggled, repair harness or connector that caused the voltage change. If flex fuel sensor voltage does not change when flex fuel sensor connector and harness are wiggled, go to next step.
- At this time, the condition required to set the trouble code is not present. LOSS OF FLEX FUEL CALIBRATION SIGNAL trouble code sets if flex fuel sensor output voltage is not 4.28-4.63 volts for 1.5 seconds after ignition is turned on. Possible causes are: open flex fuel sensor connector (Orange wire) flex fuel sensor failure, powertrain control module failure. Go to next step.
- Inspect flex fuel sensor wiring and connectors. Repair as required. If wiring and connectors are okay, see INACTIVE TROUBLE CODE CONDITION in this article. Go to TEST NTC-1A .
- Disconnect flex fuel sensor connector. Using DRB in voltmeter mode, check voltage on flex fuel sensor connector terminal No. 3 (Orange wire). If voltage is more than 7 volts, replace flex fuel sensor. If voltage is less than 7 volts, repair open Orange wire.