Freelander System Description and Operation
ENGINE MANAGEMENT SYSTEM - SIEMENS
18-4-40 DESCRIPTION AND OPERATION
Drive Cycle C+
1 This is an extended Drive Cycle C to enable the internal diagnostic process to be completed which is not
achieved by Drive Cycle C. Perform this additional drive cycle after the 3 minute idle is completed and when
prompted by TestBook/T4.
2 Perform medium acceleration to 60 mph and hold for 10 seconds.
3 Release the throttle pedal and allow the vehicle to decelerate to 50 mph.
4 Perform a second medium acceleration to 60 mph and hold for 10 seconds
5 Release the throttle pedal and allow the vehicle to decelerate to 50 mph.
6 Repeat steps 4 and 5 a further 13 times until 15 acceleration/decelerations cycles have been performed.
7 With the engine still running and TestBook/T4 connected to the vehicle diagnostic socket, check for fault codes.
8 Investigate and rectify any fault codes found and perform the relevant drive cycle procedure for the fault codes.
NOTE: DRIVE CYCLE C and C+ – Faults in the following areas also have an associated 'Readiness Test' that must
be flagged as 'completed' before the technician can verify that the problem in that are is rectified:
l
Catalytic Converter fault
l
Evaporative Loss System (EVAP) fault
l
HO2S fault
l
HO2S heater fault.
Although these tests are normally completed within Drive Cycle C, select the 'Readiness Test' icon on the TestBook/
T4 screen to verify that the test has been flagged as completed.
Drive Cycle D
1 Move the ignition switch to position II for 30 seconds.
2 Make sure that the engine coolant temperature is less than 60
°
C (140
°
F).
3 Start the engine and allow to idle for 2 minutes.
4 Perform two light accelerations (0 to 35 mph with light throttle pedal pressure).
5 Perform two medium accelerations (0 to 45 mph with moderate throttle pedal pressure)
6 Perform two hard accelerations (0 to 55 mph with heavy throttle pedal pressure).
7 Cruise at a constant 60 mph for 5minutes.
8 Cruise at a constant 50 mph for 5minutes.
9 Cruise at a constant 35 mph for 5minutes.
10 With the vehicle stationary, allow the engine to idle for 2minutes.
11 With the engine still running and TestBook/T4 connected to the vehicle diagnostic socket, check for fault codes.
12 Investigate and rectify any fault codes found and perform the relevant drive cycle procedure for the fault codes.
Drive Cycle E
1 Make sure that the fuel tank is at least
1
/
4
(25%) full.
2 Perform Drive Cycle A.
3 Switch off the engine and allow the vehicle rest undisturbed for 20 minutes.
4 Move the ignition switch to position II.
5 With TestBook/T4 connected to the vehicle diagnostic socket, check for fault codes.
6 Investigate and rectify any fault codes found and perform the relevant drive cycle procedure for the fault codes.
Drive Cycle F
1 For P codes requiring this drive cycle, TestBook/T4 will provide guidance to force the actuator or function
through a diagnostic routine to confirm correct operation.