98 oldsmobile 88 royale code 12 and 41 what could be the problem

• Air Pollution
• Automotive Emissions
• Component Locations
• Electronic Engine Controls
• Emission Controls
• Trouble Codes
• • Clearing Codes
  • Diagnosis And Testing
  • General Information
  • Reading Codes
• Vacuum Diagrams

• 98 oldsmobile 88 royale code 12 and 41 what could - bc_arrowbullet1.gif.autozone.com/autozone/">HOME
REPAIR HELP 1998 OLDSMOBILE 88 3.8L SFI OHV 6CYL REPAIR GUIDE
• DRIVEABILITY & 98 oldsmobile 88 royale code 12 and 41 what could - bc_arrowbullet1.gif/A>
• TROUBLE CODES
• READING CODES

GM Bonneville/Eighty Eight/LeSabre 1986-1999
Reading Codes

• 1987-97 VEHICLES EXCEPT 1997 MODELS WITH 16-PIN DLC
• 197 VEHICLES WITH 16-PIN DLC AND ALL 1995-99 MODELS

Print

1987-97 VEHICLES EXCEPT 1997 MODELS WITH 16-PIN DLC

See Figures 1 and 2
Listings of the trouble for the various engine control system covered in this manual are located in this section. Remember that a code98 oldsmobile 88 royale code 12 and 41 what could - 0996b43f8021af66.jpgfaulty circuit, NOT necessarily to a faulty component. Loose, damaged or corroded connections may contribute to a fault code on a circuit when the sensor or component is operating properly. Be sure that the components are faulty before replacing them, especially the expensive ones.

Fig. Fig. 1: ALDL/DLC terminal identification for 1987-97 vehicles, except 1997 models with a 16-pin DLC
The Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC) may be located under the dashboard, and is sometimes covered with a plastic cover labeled DIAGNOSTIC CONNECTOR.

1. The diagnostic trouble codes can be read by grounding test terminal B . The terminal is most easily grounded by connecting it to terminal A (internal ECM ground). This is the terminal to the right of terminal B on the top row of the ALDL connector.
2. Once the terminals have been connected, the ignition switch must be moved to the ON position with the engine not running.
3. The Service Engine Soon or Check Engine light should be flashing. If it isn't, turn the ignition switch OFF and remove the jumper wire. Turn the ignition ON and confirm that the light is now on. If it is not, replace the bulb and try again. If the bulb still will not light, or if it does not flash with the test terminal grounded, the system should be diagnosed by an experienced driveability technician. If the light is OK, proceed as follows.
4. The code(s) stored in memory may be read through counting the flashes of the dashboard warning lamp. The dash warning lamp should begin to flash Code 12. The code will display as one flash, a pause and two flashes. Code 12 is not a fault code. It is used as a system acknowledgment or handshake code; its presence indicates that the ECM can communicate as requested. Code 12 is used to begin every diagnostic sequence. Some vehicles also use Code 12 after all diagnostic codes have been sent.
5. After Code 12 has been transmitted 3 times, the fault codes, if any, will each be transmitted 3 times. The codes are stored and transmitted in numeric order from lowest to highest.

1. If there are no codes stored, but a driveability or emissions problem is evident, the system should be diagnosed by an experienced driveability technician.
2. If one or more codes are stored, record them. R98 oldsmobile 88 royale code 12 and 41 what could - 0996b43f8021af68.jpgle Diagnostic Code chart in this section.
3. Switch the ignition OFF when finished with code retrieval or scan tool readings.

<98 oldsmobile 88 royale code 12 and 41 what could - enlarge_icon.gifig. Fig. 2: Engine dia98 oldsmobile 88 royale code 12 and 41 what could - enlarge_tooltip.gifes - 1987-93 vehicles, and 1994 vehicles with a 12-pin DLC connector

197 VEHICLES WITH 16-PIN DLC AND ALL 1995-99 MODELS

See Figures 3 through 7


Fig. Fig. 3: DLC term98 oldsmobile 88 royale code 12 and 41 what could - enlarge_tooltip.gif for 1994 vehicles with a 16-pin DLC, as well as all 1995-99 models
On 1994-95 3.4L and 3.8L engines, and all 1996 models, an OBD-II compliant scan tool must be us98 oldsmobile 88 royale code 12 and 41 what could - 0996b43f8021af6a.jpgrouble codes. Follow the scan tool manufacturer's instructions on how to connect the scan tool to the vehicle and how to retrieve the codes.


98 oldsmobile 88 royale code 12 and 41 what could - 0996b43f8021af6b.jpgmages/enlarge_icon.gif" alt="enlarge_icon.gif" class="h_mi" />

Fig. Fig. 4: Engine diagnostic trouble codes (1 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles

Fig. Fig. 5: Engine diagnost98 oldsmobile 88 royale code 12 and 41 what could - enlarge_icon.gif (2 of 4) - 1994 vehic98 oldsmobile 88 royale code 12 and 41 what could - enlarge_tooltip.gifLC and all 1995-99 vehicles

Fig. Fig. 6: Engine diagnostic trouble codes (3 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles

Fig. Fig. 7: Engine diagnostic trouble codes (4 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles