October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Diagnostic Aids

PCM will hold EST low if RPM reference is not received from ignition module. If Code 41 is set with Code 42, use CODES 41 & 42 SIMULTANEOUS chart.

Fig 1: Code 41 Schematic (Saturn) EST Circuit Open Or Shorted

Fig 2: Code 41 Flow Chart (Saturn) EST Circuit Open Or Shorted