Volvo Brick Diagrar Top Site

Most 240s (1988-1993) use the same box, but some early or non-USA models may have a two-diagnostic-box setup (one for fuel, one for ignition) mounted together. The procedure is identical, just separate boxes.

You don’t need a tool – the car has one built in. Locate the box (driver’s side, near the coolant reservoir or strut tower). Lift the cover. Inside: a rocker switch, an LED, and a probe. volvo brick diagrar top

From 1988 to 1995, Volvo equipped its rear-wheel-drive "brick" models (240, 740, 760, 780, 940, and early 960) with a small diagnostic box. It is usually located on the left inner fender (driver's side) , near the strut tower. It measures roughly 2x3 inches and has a flip-up lid. Most 240s (1988-1993) use the same box, but

Inside the lid, you will find a top-down diagram (often faded or missing), showing you where to insert the diagnostic probe. This article serves as your replacement diagram and comprehensive guide. For early 240s: Ground pin 2 (or 6)

| Code | Meaning | |------|---------| | 1-1-1 | System OK | | 1-2-3 | Coolant temp sensor (CTS) – check resistance | | 2-1-2 | O2 sensor circuit | | 2-2-1 | Fuel trim at limit – vacuum leak | | 3-2-2 | MAF burn-off circuit – common wiring issue |

After fixing the issue, clear the codes:

For early 240s: Ground pin 2 (or 6) for 20+ seconds, or disconnect battery for 10 minutes.