Notes On Intermittents

If PCM Code E020 is stored as history code, unplug oil pressure switch. Start engine, and allow it to idle. Manipulate affected wiring, and check relay for proper installation into socket. If fault is induced, engine will stall and Code E020 will set. If PCM Code E020 sets without engine stalling, check for intermittent open in circuit No. 120 between PCM terminal E13 and splice to fuel pump relay.

Fig 1: PCM Code E020, Schematic, Open Fuel Pump Circuit

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E020, Flow Chart, Open Fuel Pump Circuit (1 Of 3)

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E020 (1 Of 3)