1992 Volvo 240 GL, StandardFACTORY OEM SERVICE PROCEDURE

Retrieving Codes

  1. Locate diagnostic unit, and remove its cover. Connect selector cable to socket No. 5. Turn ignition to ON position. Enter control function No. 1 (access codes) by pressing push button one time for at least one second and no more than 3 seconds.
  2. Watch Red LED, and count number of flashes in 3-flash series. Flash series are separated by 3-second intervals. See Figure . Note all codes. Only 3 separate codes can be stored at once. If no codes are stored, LED will flash a 1-1-1 to indicate turbo system is operating properly.
  3. If a fault code is received, refer to TURBO SYSTEM FAULT CODES table. Depress push button again, and check for additional codes. Depress push button a third time if necessary. If first code repeats, no other codes are present.
  4. Diagnostic system memory is full when 7 codes are present. Those codes must be repaired before further codes can be retrieved.
NOTE: Not all codes listed in TURBO SYSTEM FAULT CODES table are used on every vehicle.
TURBO SYSTEM FAULT CODES (1)

Code Fault Repair
1-1-1 No Faults N/A
2-4-2  Turbo Control Valve (2) Check Turbo Control Valve
3-1-2  Knock Sensor Signal Check For Knocking
3-4-2  A/C Blocking Relay Check A/C Blocking Relay
4-2-1  Press. Sensor Signal (3) Check Turbo Control Valve
4-2-3  Throttle Pos. Sensor Check Sensor
4-3-1  Temp. Sensor Signal Check Sensor
4-2-4  Load Signal Check Load Signal
(1) See FAULT CODE TESTING under SELF-DIAGNOSTICS - TURBO SYSTEM  .
(2) Resistance check.
(3) Mechanical check.
Factory Service Tools

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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.

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