TEST TC-24A - LOSS OF FLEX FUEL CALIBRATION SIGNAL (DTC 64)
Note. For circuit & connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY TABLE . 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»(ref-10832-S03331063412000111000000) in this article. Go to «TEST NTC-1A»(ref-10832-S21755503722000111000000) .
- 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.
TEST NTC-5A - CHECKING TPS CALIBRATION
Note. After each repair, perform TEST VER-2 .
- Turn engine off. Turn ignition on. Using DRB, read Throttle Position Sensor (TPS) voltage. Ensure throttle is fully closed and against throttle stop. If voltage is not 1.2 volts or less with throttle closed, replace TPS. If voltage is 1.2 volts or less with throttle closed, go to next step.
- Observe voltage while slowly opening throttle wide open. If voltage change is not smooth, replace TPS. If maximum voltage is not at least 3.7 volts at wide open throttle, replace TPS. If voltage change is smooth and maximum voltage is at least 3.7 volts at wide open throttle, test is complete.
TEST NTC-6A - CHECKING MAP SENSOR CALIBRATION
Note. After each repair, perform TEST VER-2 .
- Turn engine off. Install vacuum "T" in MAP sensor vacuum hose. Install vacuum gauge. Start engine, and let it idle. If engine will not idle, maintain a constant RPM above idle. Go to next step.
- Using DRB, read MAP gauge value. If reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor. If reading is within one in. Hg of vacuum gauge reading, test is complete.