Notes On Intermittents

If code "E021" is intermittent, manipulate related wiring while observing ECM parameter ED01. Check TPS and TPS test point connectors for shorts to voltage.

Cycle TPS through its travel and tap on TPS with a pencil or pocket screwdriver to test for intermittent TPS. If fault is induced, the parameter will skip to a high throttle angle.

Fig 1: Hard Trouble Code E021 - Shorted TPS Circuit

NOTE: If Hard Code E021 Is Accompanied By Hard Code E015,

See DFI Chart A, Multiple ECM Codes Stored Hard

Fig 2: Hard Trouble Code E021 - Shorted TPS Circuit (1 of 2)

Fig 3: Hard Trouble Code E021 - Shorted TPS Circuit (2 of 2)

Fig 4: Schematic for Hard Trouble Code E021