DTC 80

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) has the ability to learn the Throttle Position (TP) sensor and idle speed positions by constantly updating them in the PCM memory. These values are then stored in the EEPROM within 30 seconds of the key being turned "OFF." If the PCM detects a condition where the TP sensor or idle learn values are not stored (EEPROM reset), it will illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon) and set DTC 80.

DTC 80 WILL SET WHEN
TP sensor/idle learn is not complete following an EEPROM reset.

ACTION TAKEN (PCM WILL DEFAULT TO)
With a current DTC 80 set, the PCM will illuminate the Malfunction Indicator Lamp (MIL) (Service Engine Soon).

DTC 80 WILL CLEAR WHEN
The fault no longer exists and the idle learn procedure has been successfully completed.

DIAGNOSTIC AIDS
DTC 80 can be set by disconnecting the battery before the TP sensor/idle learn values are stored in the EEPROM (within 30 seconds of key "OFF"). DTC 80 can also be caused by an incorrect or intermittent input signal from the following: TP sensor, closed throttle position switch, vehicle speed sensor, transaxle range switch, power steering pressure switch, or brake switch. A condition which causes a rough or unsteady idle may also cause DTC 80 to be set. Use CHART C-2B, "ISC Motor Check," to diagnose incorrect idle condition. Chart C-2B Idle Speed Control (ISC) Check

NOTE:
- While performing the "TPS/IDLE LRN" procedure, ensure that nothing touches or interferes with the accelerator pedal. also, ensure that the NC is "off" and there is no load on the power steering while performing the procedure.
- If a current DTC 80 is encountered, perform the TECH 1 ISC SYSTEM "TPS/IDLE LRN" procedure in the misc.. tests. If DTC 80 remains current after performing the procedure, refer to "diagnostic aids."
Service and Repair