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VOLVO 850 ENGINE DIAGNOSTIC CODES 1992-1995
With the ignition switched off, unclip the selector cable into socked No 2 of module A
Write down the the fault codes to reference
Turn the ignition ON with the selector cable inserted, press the button on module A once, for about one second, then release it and wait for the LED to flash.
As the LED flashes, write down the foult code
Press the button again, to check is there any additional fault code
Continue until the first fault code is diplayed again
FAULT CODE MEANING
1-1-1 No fault detected
1-1-2 Fault in ECU
1-2-3 Coolant temperature sensor signal absent
1-3-1 RPM sensor signal absent
1-4-3 Front knock sensor signal absent or faulty
1-4-4 Load signal from fuel injection system ECU absent
1-5-4 Leak in EGR system*
2-1-4 RPM sensor signal absent intermittently
2-4-1 EGR system flow faulty*
3-1-1 Vehicle speed sensor signal absent or faulty
3-1-4 Camshaft position sensor signal absent
3-2-4 Camshaft position sensor absent intermittently
4-1-1 Throttle position sensor signal absent or faulty
4-1-3 EGR temperature sensor signal absent or faulty*
4-3-2 High temperature in ECU module box
4-3-3 Rear knock sensor signal absent or faulty
5-1-3 Excessively high temperature in ECU module box
* Only engines with electroncally controled exhoust gas recirculation system
VOLVO 850 FUEL INJECTION CODES Fenix 5.2 system
FAULT CODE MEANING
1-1-1 No fault detected
1-1-2 ECU fault
1-1-3 Short term fuel mixture too weak
1-1-5 Faulty signal to No 1 cylinder injector
1-2-1 MAP sensor signal absent or faulty
1-2-2 Intake air temperature sensor signal absent or falty
1-2-3 Coolant temperature sensor signal absent or faulty
1-2-5 Faulty signal to No 2 cylinder injector
1-3-2 Batery voltage too low or too high
1-3-5 Faulty signal to No 3 cylinder injector
1-4-3 Front knock sensor signal absent or faulty
1-4-4 Load signal absent or faulty
1-4-5 Faulty signal to No 4 cylinder injector
1-5-2 Air pump valve signal absent or faulty*
1-5-4 Leak in EGR system*
1-5-5 Faulty signal to No 5 cylinder injector
2-1-2 Heated oxygen sensor signal absent or faulty
2-1-4 Engine RPM sensor signal absent
2-2-1 Long term fuel mixture too weak in part-load stage
2-2-2 Main realay signalabsent or faulty
2-2-3 Idle air control valve signal absent or faulty
2-2-5 Air conditioning pressure sensor signal absent or faulty
2-3-1 Long term fuel mixture too rich in part-load stage
2-3-2 Long term fuel mixture too weak at idle
2-3-3 Long term idle air trim outside control range
2-3-5 EGR controller signal absent or faulty*
2-4-1 EGR system flow fault*
2-4-3 Throttle position sensor signsl outside voltage range
2-4-4 Knock control at limit
3-1-1 Vehicle speed sensor (speedometer) signal absent
3-1-3 EVAP valve signal absent or faulty*
3-1-4 Camshaft position sensor signal absent or faulty
3-2-3 Malfunction inducator lamp signal faulty
3-2-5 ECU memory loss
3-3-5 Request for malfunction indicator lamp from automatic transmision ECU
3-4-2 Air conditioning system ralay control signal faulty
3-4-3 Fuel pump relay signal absent or faulty
4-1-1 Throttle position sensor signal outside voltage range
4-1-3 EGR temperature sensor signal absent or faulty*
4-3-2 High temperature in ECU module box
4-3-3 Rear knock sensor signal absent or faulty
4-3-5 Heated oxygen sensor response slow
4-4-2 Air pump relay signal absent or faulty*
5-1-1 Long term fuel mixture too rich at idle
5-1-2 Short term fuel mixture too rich
5-1-3 Excessively high temperature in ECU module box
5-1-4 Engine cooling fan faulty at half speed
5-1-5 Engine cooling fan faulty at full speed
5-2-1 Oxygen sensor heating faulty
5-2-3 Signal to ECU module box cooling fan shorted to 12 volts
5-2-4 Transmission torque control signal faulty
5-3-5 Turbo regulator valve fault
* Only engines with certain emission control equipment
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VOLVO 850 FUEL INJECTION CODES Motronic 4.3 system
FAULT CODE MEANING
1-1-2 ECU
1-1-5 Signal to No 1 cylinder injector
1-2-1 MAF sensor
1-1-5 Signal to No 2 cylinder injector
1-2-3 Coolant temperature sensor
1-3-1 Engine RPM sensor
1-3-2 Battery voltage
1-3-5 Signal to No 3 cylinder injector
1-4-3 Front knock sensor
1-4-4 Load signal
1-4-5 Signal to No 4 cylinder injector
1-5-2 Air pump valve*
1-5-4 Leak in EGR*
1-5-5 Signal to No 5 cylinder injector
2-1-2 Heated oxygen sensor
2-1-4 Engine RPM sensor absent intermittently
2-2-3 Idle air control valveopening signal
2-2-5 Air conditioning pressure sensor signal
2-3-1 Long term fuel mixture too weak or to rich in part load stage
2-3-2 Long term fuel mixture too weak or too rich at idle
2-3-3 Long term idle air trim outside control range
2-3-5 EGR controller signal*
2-4-1 EGR system flow fault*
2-4-3 Throttle position sensor signal outside voltage range
2-4-4 Knock control at limit
2-4-5 Idle air control valve closing signal
3-1-1 Vehicle speed sensor
3-1-3 EVAP valve signal*
3-1-4 Camshaft position sensor
3-1-5 EVAP system fault*
3-2-3 Malfunction indicator lamp
3-2-5 ECU memory loss
3-3-5 Request for malfunction indicator lamp from automatic transmision ECU
3-4-2 Air conditioning system ralay control signal faulty
3-4-3 Fuel pump relay signal absent or faulty
4-1-1 Throttle position sensor signal outside voltage range
4-1-3 EGR temperature sensor signal absent or faulty*
4-1-4 Turbo boost pressure too high
4-1-6 Turbo boost pressure reduced by automatic transmission ECU
4-3-2 High temperature in ECU module box
4-3-3 Rear knock sensor signal absent or faulty
4-3-5 Heated oxygen sensor response slow
4-4-2 Air pump relay signal absent or faulty*
5-1-1 Long term fuel mixture too rich at idle
5-1-2 Short term fuel mixture too rich
5-1-3 Excessively high temperature in ECU module box
5-1-4 Engine cooling fan faulty at half speed
5-1-5 Engine cooling fan faulty at full speed
5-2-1 Oxygen sensor heating faulty
5-2-3 Signal to ECU module box cooling fan shorted to 12 volts
5-2-4 Transmission torque control signal faulty
5-3-5 Turbo regulator valve fault
5-4-1 EVAP valve fault
* Only engines with certain emission control equipment
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VOLVO 850 FUEL INJECTION CODES LH3.2-Jetronic system
FAULT CODE MEANING
1-1-1 No fault detected
1-1-2 Fault in ECU
1-1-3 Short term fuel mixture too rich
1-2-1 MAF sensor
1-2-3 Coolant temperature sensor
1-3-1 Engine RPM signal from ignition system
1-3-2 Battery voltage
1-3-1 Engine RPM sensor
2-1-2 Heated oxygen sensor
2-2-1 Long term fuel mixture too weak in part-load stage
2-2-3 Idle air control valve
2-3-1 Long term fuel mixture too rich in part-load stage
2-3-2 Long term fuel mixture too weak at idle
3-1-1 Vehicle speed sensor
4-1-1 Throttle position sensor signal outside voltage range
5-1-1 Long term fuel mixture too rich at idle
5-1-2 Short term fuel mixture too rich
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VOLVO 850 SERVICE REMINDER LIGHT RESETTING
Switch on the ignition
Insert the test lead of the diagnostic module into socket 7 of module A
Press the test button on the diagnostic unit four times briefly but firmly
If the LED illuminates and stays illuminated, the system is ready for code input
Now You have to enter the code for resetting the servise interval counter, which is 1-5-1
To do this :
Press the test button once and release it; wait for the LED to illuminate again, then
Press the test button five times
When the LED illuminates again, press the test button once
When the LED flashes several times in succession, the code has been successfully entered
The service interval counter should have been reset
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VOLVO 850 ABS and TRACS fault codes
FAULT CODE MEANING
1-1-1 No fault detected
1-2-1 LH front wheel - faulty signal at speed less than 25 mph
1-2-2 RH front wheel sensor - faulty signal at speed less than 25 mph
1-2-3 LH rear wheel - faulty signal at speed less than 25 mph
1-2-4 RH rear wheel - faulty signal at speed less than 25 mph
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Computer counter reading
Insert the test lead of the diagnostic module into socket 7 of module A
Switch on the ignition
Press the test button on the diagnostic unit five times briefly but firmly
If the LED illuminates and stays illuminated, press once and wait for LED
If the LED illuminates, press once again and wait for LED
If the LED illuminates, press two times and wait for LED
Now You should see three series of LED flashes
First - hundreds
Second - tens
Third - ones
If the LED flashes ten times, it means 0
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