1992 Porsche 911 AmericaFACTORY OEM SERVICE PROCEDURE

Using Diagnostic Connector

  1. Ensure transmission is in Park or Neutral, and ignition is off. Diagnostic connector is located underneath a cover, in front passenger's footwell. Connect Porsche System Tester (9288), or Porsche Flashing Code Tester (9268) with Adapter Lead (9268/2) to diagnostic connector.
  2. If system tester is used, turn tester on and follow instructions displayed. In addition to reading fault memory, it is possible to activate a number of components with this tester.
  3. If flashing code tester and adapter lead is used, the 4-digit fault code(s) will be flashed by the tester. If the number 1 is displayed in the second digit of the code, then fault was present during the last vehicle operation. If the number 2 is displayed in the second digit, then fault was not present when vehicle was last operated. See FAULT CODE IDENTIFICATION .
FAULT CODE IDENTIFICATION

Code (1) System Affected Probable Cause
1000 (2) - End Of Output
1111 DME Power Supply Power Supply Less Than 10 Volts Or Greater Than 16 Volts
1112 (2) Idle Speed Switch Short In Ground Circuit
1113 Full Throttle Switch Short In Ground Circuit
1114 (2) Engine Temperature Sensor Open Circuit
1121 (2) Airflow Sensor (3) Signal Not Plausible
1123 (2) Oxygen Sensor Air/Fuel Mixture Too Rich/Too Lean
1124 (2) Oxygen Sensor Open/Shorted Ckt Or Faulty Sensor
1125 Intake Air Temp. Sensor Open/Short Circuit
1131 Knock Sensor No. 1 (3) Signal Not Plausible
1132 Knock Sensor No. 2 (3) Signal Not Plausible
1133 Knock Regulation Knock Computer Faulty
1134 Hall Effect Sensor Open/Short Circuit
1141 (2) DME Control Unit DME Control Unit Faulty
1151 (2) Fuel Injector No. 1 Open/Short Circuit
1152 (2) Fuel Injector No. 2 Open/Short Circuit
1153 (2) Fuel Injector No. 3 Open/Short Circuit
1154 (2) Fuel Injector No. 4 Open/Short Circuit
1155 (2) Fuel Injector No. 5 Open/Short Circuit
1156 (2) Fuel Injector No. 6 Open/Short Circuit
1500 (2) System Okay No Faults Stored In Memory
(1) Except for Code 1000 and Code 1500, the second digit of all other codes can also be a 2, indicating that fault did not exist during last operation of vehicle.
(2) On 1991 models, these codes can also be displayed by CHECK ENGINE light. Other flashing codes are also possible but DO NOT  represent a warning regarding CHECK ENGINE  light.
(3) Signal of a monitored component is not conforming with memory contents of DME control unit. The control unit recognizes that there is a faulty signal, but cannot always recognize the cause of the faulty signal.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.