Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1993 Volvo 850 L5-2.4L VIN 55 B5254SFACTORY OEM SERVICE PROCEDURE
Connector Views
35 Position ECU Plug:
PIN LAYOUT
SYSTEM
LH-Jetronic
Checking ECU Ground Connections:
LOCATION
Kick panel passenger side
TERMINAL ID
1 - From EZK ECU Trigger signal (Pin 17)
2 - Closed throttle
3 - Full load Throttle (non-turbo only)
4 - Battery (+) feed
5 - Ground
6 - Air Mass Meter Supply
7 - Air Mass Meter Load
8 - Air Mass Meter Burn-off
9 - Main Relay Supply
10 - NO CONNECTION
11 - NO CONNECTION
12 - Diagnostic Connector
13 - Coolant Temperature Sensor
14 - A/C Compressor cut-off relay
15 - A/C Control Switch
16 - NO CONNECTION
17 - Ground
18 - Injector Driver (4)
19 - Ground
20 - Fuel Pump Relay Control
21 - Main Relay Control
22 - Instrument Cluster
23 - NO CONNECTION
24 - O2 Sensor Signal
25 - Output to EZK ECU
26 - Instrument Cluster
27 - Canister Solenoid Control 740GLE
- No connection on 240,240DL, & 740GL
28 - From EZK Computer (Pin 4)
- No connection 740GL
29 - Ground
- No connection 740GL
30 - Starter / Test Connector on 740GL
31 - NO CONNECTION
32 - Cold Start Injector
- Not installed on 74OGLE, & 940
33 - ISC Valve
34 - Speedometer
35 - Ignition Switch
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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