Valeo REVO-E - Sensor value high pressure implausible low; Sensor value suction pressure implausible low; System locked due to too many instances of high pressure; System locked due to too many instances of low pressure

506
REVO-E Heat pump 5 Troubleshooting
Actions
– Measured values on sensor NOK => replace sensor
– Measured values on SC620 plug NOK => inspect pins
/ replace cable harness
– Measured values on cable harness SC620 side OK
=> replace SC620
F12 Sensor value high pressure implausible low
(evaluation of sensor signal)
(measured value Pabs < 0bar)
System behavior
– Error occurs after multiple switching of the low-pres-
sure safety switch (at 11123865_ virtual via software)
– only in combination with F18
In Cooling Mode:
– default value high pressure 20bar
– axial fans maximum speed
In Heat Pump Mode:
– radial blowers maximum speed
– compressor minimum speed
Necessary inspections
– Sensor values using DCT
– Check pressure with pressure gauge and calibrate
with sensor values
(Attention: sensor values are absolute values)
– Sensor resistance 5.4kOhm on the sensor / to the
SC620 plug (SC620 not connected) according to
wiring plan when compressor has not been function-
ing for long period of time
– Voltage present on sensor (SC620 / sensor plug con-
nected) when system running
~7.4bar ~6.4bar
1.36V 1.5V
When compressor has been off for a longer time
1.7V at 15°C
Actions
– Measured values on sensor NOK => replace sensor
– Measured values on SC620 plug NOK => inspects pin
/ replace cable harness
– Measured values on cable harness SC620 side OK
=> replace SC620
F14 Sensor value suction pressure implausible low
(evaluation of sensor signal)
(measured value Pabs < 0bar)
System behavior
– default value 0.5bar => compressor off
– that means below the threshold low pressure
– error entry F12 + F18
Necessary inspections
– Sensor values using DCT (operating >2 bar)
– Check pressure with pressure gauge and calibrate
with sensor values
(Attention: sensor values are absolute values)
– Plug connection to sensor
– Measurements on X854 plug
– Sensor power supply (5V)
– Sensor voltage (feedback) when compressor de-
activated
– Sensor voltage (feedback) when compressor de-
activated (2V-4V)
Note: Compressor controllable using DCT compo-
nents test.
Actions
– Replace cable harness or SC620
– Replace sensor
F15 System locked due to too many instances of high
pressure
System behavior
– System locked due to too many instances of high
pressure (5x)
– Error only in combination with F18
Necessary inspections
– Sensor values using DCT (after first unlocking
system)
– If high pressure error + axial fan speed high
– Air flow at condenser (dirty condenser)
– Amount of refrigerant (according to Volvo docu-
mentation)
– If high pressure error + axial fan speed low
– Comparison of sensor value DCT with high-pres-
sure system measured with manometer
Actions
– To unlock the system, press the Gas Charging button
(above driver) for at least 15 s. System can then be in-
spected.
– Clean heat exchanger fins
– Refill according to Volvo documentation
– Replace sensor
F16 System locked due to too many instances of low
pressure
System behavior
– SW low-pressure safety switch triggers => P<1.2bara
for >22 s
– After 3 times low pressure event, system locked
– Error only in combination with F18
Necessary inspections
– Sensor values using DCT (after unlocking the system
first)
– Solenoid valve with DCT components test (acoustic)