Notes On Intermittents

If Code EO21 is intermittent, manipulate related wiring while observing ECM parameter ED01. Check TPS connector for shorts to voltage.

Cycle TPS through its travel and tap on TPS with a pencil to test for intermittent TPS operation. If fault is induced, parameter will skip to high throttle angle. If wiring and connectors are okay, substitute a known good TPS sensor and retest.

Review snapshot data parameters stored with this code to verify failure. If failure is verified, check and repair intermittent wiring connection or sensor.

Fig 1: ECM Code E021, Shorted TPS Circuit Schematic

Fig 2: Flow Chart, Code E021, Shorted TPS Circuit