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Note On Intermittents

WARNING: This page is about a different car, the 1989 Cadillac Fleetwood and 1989 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

If Code E21 is intermittent, manipulate related wiring while observing ECM parameter P.0.1. 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: Code E21 Schematic - Shorted Throttle Position Sensor Circuit
G57133
Fig 2: Code E21 Flow Chart - Shorted Throttle Position Sensor Circuit
G111623
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