On Board Diagnostic (OBD) version ONE
Diagnostic Trouble Code (DTC) Chart
From the cars computer, called the Powertrain Control Module (PCM or ECU \ ECM)
For 1991-1995 S-Series (Saturn) cars only
Via the cars ADLC connector.

11 Transaxle Codes present
12 Diagnostic System Check
13 Oxygen sensor, circuit open or not ready
14 Engine coolant temp. circuit. Temp. out of range high
15 Engine coolant temp. circuit. Temp. out of range low
17 PCM fault, pullup resistor
19 1991 Perf. (LLO) 1992-1994 vehicles. 6X signal fault
21 Throttle position circuit out of range high
22 Throttle position circuit out of range low
23 Inlet air temp. (IAT) out of range low
24 Vehicle speed sensor (VSS) circuit, no signal
25 Inlet air temp. (IAT) out of range high
26 Quad Driver output fault
32 EGR system fault
33 MAP sensor circuit, out of range high
34 MAP sensor circuit, out of range low
35 Idle air control rpm out of range
41 Ignition control circuit open or shorted
41A EST circuit open
41B EST circuit shorted
42 EST bypass, open or shorted
42A Bypass circuit grounded
42B Bypass circuit open
42C Bypass circuit shorted
43 ESC (knock sensor) circuit open or shorted
44 Oxygen sensor indicates system lean
45 Oxygen sensor indicates system rich
46 Power steering pressure switch circuit, open
49 Idle rpm out of limit high (vacuum leak)
51 PCM memory error
55 A/D convertor error in PCM
81 ABS message fault (1993+ vehicles with TCS)
82 PCM internal communication fault
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