B45-50: Pressure Switch/Pressure Sensor
Pressure switch / Pressure sensor F-Turbo engines onlyOperations B45-50
B45
Connect test meter
- Dwell-angle meter. Connect the meter to the service connection for Lambda-sond.
- CO gauge. Connect the gauge to the socket on the exhaust pipe in front of the catalytic convener.
B46
Warm-up the engine
B47
Connect pressure gauge 5230 and the pump
Connect to the hose from the intake manifold.
1 = pressure switch
2 = delay valve (auto only). The colored side should face away from the pressure switch
3 = pressure sensor
4 = boost pressure gauge
B48
Check full load enrichment
The engine must be running.
Increase the pressure to 20.3 kPa (2.9 psi). The dwell angle gauge should drop to 64-70° (the pressure switch earths/grounds the lambda send control unit).
If pressure incorrect: test with a new pressure switch.
If dwell angle reading is incorrect: check the lambda sond system for faults.
Fuel enrichment at full load is necessary to ensure the internal cooling of the engine. If the fuel-air mixture is too lean, the combustion temperature will rise and the engine may overheat.
B49
Check the pressure sensor
Increase the pressure until the engine stops (the pressure sensor interrupts the pump relay earth/ground connection).
Caution! Do not exceed 120 kPa (17.4 psi) otherwise the boost pressure gauge will be damaged.
The engine should stop at a pressure of 70 kPa (10.1 psi), the boost pressure gauge should indicate red and the turbo lamp should glow.
B50
Turn off the engine. Disconnect pressure gauge 5230 and the pump
Reconnect the hose to the intake manifold.