LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 1992 >> 240 GL, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostics - Turbo System >> Control Function No. 1 >> Retrieving Codes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
scientia non olet · About LEMON Manuals