Diagnostics, Fault-Tracing

Diagnostics, fault-tracing




Diagnostics and fault tracing are carried out as before using VIDA. However from the 1999 model year onwards the Volvo Scan Tool (ST) (which could only communicate serially via the data link connector (DLC)) has been replaced by a new communication unit called the VCT 2000 (Volvo Communication Tool 2000) which can communicate with the modules via the network.

Car communication
The following can be read off using car communication:

Read diagnostic trouble codes (DTCs)
ME 7.0 engine management system contains approximately 135 diagnostic trouble codes (DTC). Each diagnostic trouble code (DTC) can give information on whether the fault depends on an open-circuit, short-circuit to supply voltage or short-circuit to ground. This gives a combined total of 405 different diagnostic trouble codes (DTCs).
The following output signals/components can be activated:

Activation
- Injectors (sequentially)
- Power stages/ignition coils (sequentially)
- air conditioning (A/C) relay (compressor clutch)
- Output signal engine coolant temperature sensor
- Indicator lamp CRUISE
- Econometer signal to the Driver information module (DIM)
- Engine cooling fan (FC) (3 speeds)
- Engine speed (RPM) to DIM
- Electronic Throttle System warning lamp
- EVAP canister shut-off valve
- Turbocharger (TC) control valve
- Canister purge (CP) valve
- Fuel pump (FP) relay
- Malfunction Indicator Lamp (MIL)
- Heating front heated oxygen sensor (HO2S)
- Heating rear heated oxygen sensor (HO2S)
- Continuous Variable Valve Timing (CVVT) camshaft control valve
- Interlock function (starter motor relay),USA/CDN only

Reading off plotter
Here curves and values for approximately 90 parameters can be read off. As before a maximum of 3 can be read at the same time.

Activating diagnostic functions
This is a new function for activating the different test phases in the following on-board diagnostic (OBD) systems:
- Return Fuel Lacking System (RFLS)
- Pulsed secondary air injection system (PAIR)

Leak diagnostic
The diagnostic has the same version and function as the ME 7.0 on the S70, V70 and C70.

Misfire diagnostic

The diagnostic has the same version and function as the ME 7.0 on the S70, V70 and C70.