Maintenance
Fault-Finding
131 9831/0650-3 131
Check the condition of sensor to harness connection, make
sure the seals are in place, check for signs of corrosion or con-
tamination. Repair/replace as necessary.
2 Sensor connection faulty
If no fault is found, proceed to Step 3.
Check the sensor resistance (see relevant helpfile page). If
sensor is out of specification replace.
3 Sensor failure
If no faults is found, proceed to Step 4.
Check the harness continuity and machine and engine earth
contacts. Repair/replace as necessary.
4 Wiring faults
If no fault found, raise Techweb Helpdesk call.
Table 50. General Relay Fault
Step Trouble Action/Remedy
Perform the relay test routine.
If relay supply voltage is found fault, proceed to Step 2.
1 Relay supply voltage fault
If relay supply voltage is OK, raise Techweb Helpdesk Call.
Check the condition of relay to harness connection, make sure
the seals are in place, check for signs of corrosion or contami-
nation. Repair/replace as necessary.
2 Relay connection faulty
If no fault is found, proceed to Step 3.
Table 51. Electrical Network - CanBus system
Step Trouble Action/Remedy
Check the harness continuity and electrical insolation, re-
pair/replace as necessary.
1 Wiring fault
If no faults is found, proceed to Step 3.
Check the network and CAN resistors, repair as necessary.2 Network and CAN (Controller
Area Network) resistors faulty
If no fault is found proceed to raise Techweb Helpdesk call.
Table 52. Injector Calibration
Step Trouble Action/Remedy
Check that `individual injector corrections' are correctly entered
in ECU. Check the cylinder position and value.
1 Injector cylinder position and
value fault
If no faults is found, proceed to Step 3.
Re-flash the injector calibration codes, respecting power down
and up delay and taking care of injector position; erase all the
faults.
2 Injector program fault
If no fault is found proceed to step 4.
Check the knock sensor connection and screw torque, repair
as necessary. Check the ground shield connection of knock
sensor.
3 Electrical connection faulty
If no knock sensor is installed, raise Techweb Helpdesk call.
Table 53. High Pressure Fuel Valve
Step Trouble Action/Remedy
Check the connection of HPV.
If the HPV connection is faulty, repair or replace as necessary.
1 HPV (High Pressure Valve)
connection fault
If no fault is found proceed to step 2.
Check the harness continuity and electrical insolation, re-
pair/replace as necessary.
2 Wiring fault
If no fault is found proceed to step 3.
3 Electrical resistance fault Measure the HPV electrical resistance, it should be around
2.2Ω at 25°C (77.0°F).
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