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Saturn Code Retrieval

Accessing Diagnostic Trouble Codes

1991-95

Diagnostic trouble codes (DTC's) may be read by using a suitable diagnostic scanner or the Service Engine Soon Lamp. The diagnostic scanner, which displays data transmitted by the PCM (Powertrain Control Module), is plugged into the Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC), which is located below LH side of instrument panel. To access DTC's using the Service Engine Soon lamp, connect a jumper wire from ALDL/DLC connector terminal B (diagnostic terminal) to terminal A (internal PCM ground), Fig. 1.

Fig. 1 ALDL/DLC terminal identification.

When using the Service Engine Soon Lamp to access diagnosis trouble codes, once terminals A and B have been connected, turn the ignition switch to the On position, but do not start engine. The Service Engine Soon Lamp will flash DTC 12 three times consecutively. DTC 12 will flash in the following sequence, flash, pause, flash-flash, long pause, flash, pause, flash-flash, long pause and flash, pause, flash-flash, long pause. DTC 12 indicates that the PCM diagnostic system is operating. If DTC 12 is not indicated, a problem is indicated within the diagnostic system. Following the output of DTC 12, the lamp will indicate a diagnostic trouble code three times, if a DTC is present, or will continue to output DTC 12. If more than one DTC has been stored in the PCM, the DTC's will be displayed from the lowest to the highest, with the exception of DTC 11, which indicates transaxle DTC's. DTC 11 will always flash last followed by the Shift to D2 lamp which will flash transaxle DTC's. Each DTC will be displayed three times. These models also use information flags. These flags do not indicate a failure and will not turn on the service engine soon lamp. Information flags are used as a diagnostic aid when hard DTC's or intermittent problems occur. Engine information flags will not be flashed on the service engine soon lamp and they can only be read with a scan tool. Automatic transaxle flags will flash on the Shift to D2 lamp.

1996

The data link connector (DLC) is located under the instrument panel, and the DTC's can only be read through a hand-held diagnostic scan tool plugged into this connector with the ignition turned On. Several brands of scan tools are available. Read the manufacturer's instructions carefully before connecting and reading DTC's.

Clearing Diagnostic Trouble Codes

1991-95

When a diagnostic trouble code or flag is stored in the PCM memory, it is either general information or malfunction history. When clearing DTC's from general information without a scan tool, turn the ignition On and ground ALDL/DLC connector terminals A and B three times within five seconds. General information can also be cleared with 50 ignition On/Off cycles. Malfunction history can only be cleared with a scan tool. Disconnecting power to the PCM has no effect on stored DTC's or flags in the malfunction history, but will clear DTC's and flags in general information.

1996

Select the scan tool's "Clearing Diagnostic Trouble Codes" menu option. Disconnecting the battery for 60 seconds or longer will also clear DTC's, active and history from the PCM's memory, along with malfunction history records.

Diagnostic Trouble Code Identification

1991-95

DTC Circuit Or Condition
11 Transmission DTC Present
12 Diagnostic Check Only (Flash DTC)
13 Oxygen Sensor Circuit (Open/Not Ready)
14 CTS Circuit (Temperature Out Of Range, High)
15 CTS Circuit (Temperature Out Of Range, Low)
16 Electronic Variable Orifice (EVO) Fault
17 PCM Fault (Pull-up Resistor)
19 6X Signal Faults
21 TPS Circuit (Voltage Out Of Range, High)
22 TPS Circuit Voltage Out Of Range, Low
23 IATS Circuit (Temperature Out Of Range, Low)
24 No VSS Circuit Signal

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