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Fault finding - Function82D
3. Starting
The UCH controls the command and supply part of the start-up function while the start-up-charging process is
controlled by the UCH. For this function to operate normally, the protection function must have been successfully
completed.
To enable the starting command the UCH needs information about the following statuses and parameters:
–ET142 Engine operating phase
–ET239 Ignition switch position
–PR025 "Engine speed"
*Powerlatch: Time required for injection computer supply after + 12 V APC cut-off to the ignition switch.
Extended memory key:
In this case, the UCH sends data to the key at specific times to provide the key with up-to-date application data when
the + after ignition feed is cut off.
The following information can be retrieved on the multiplex line:
–The vehicle identification number.
–If entered by customer services: the customer's contact details.
–The total vehicle mileage.
–The fuel level.
–The mileage before oil service.
The UCH sends this information to the key under the following conditions:
–Every time the vehicle is started.
–Every time the vehicle speed drops below 3 mph (5 km/h) and if 1 mile (2 km) have been travelled since the last
record. IMPORTANT
When the vehicle battery has a low charge, the drop in voltage caused by operating the starter could reactivate
the immobiliser. If the voltage is too low, the engine cannot be started, even by pushing the vehicle.
Note:
If several, i.e. three or four, attempts have been made using a key not allocated to the vehicle, the injection
computer locks. Insert a key allocated to the vehicle for 20 seconds in + after ignition feed, then switch off the
ignition and wait for the end of "powerlatch*" (20 minutes) to allow the injection computer to unlock.
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Fault finding - Fault Finding Chart82D
ALP 25Starting protection (vehicle does not start when the ignition
key is turned)
NOTESCheck the battery voltage and the presence of (correct) fuel in the fuel tank.
Only consult this customer complaint after a complete check with the diagnostic tool.
Check the operation of the following statuses and parameters in particular: ET046
Immobiliser, ET239 Ignition switch position, ET142 Engine operation phase,
ET229 Injection immobiliser code and PR025 Engine speed.
Carry out a full conformity check on the protection and starting sub-function.
Note:
If the user makes three consecutive attempts to start the vehicle using a key which does not belong to the vehicle,
the injection computer goes into protection mode and there is no dialogue with the UCH.
Use the following procedure to bring the injection computer out of protection mode and to re-establish dialogue
between the injection computer and the UCH:
–Obtain a key which belongs to the vehicle.
–Put the key in the ignition switch in the + After ignition position for 20 seconds.
–Switch off the ignition and wait for the end of powerlatch (20 minutes).
If the engine will not start after this operation, apply the following procedure.
Check the battery (see 80A, Battery) and the charge circuit (see 16A, Starting-charging).
Carry out fault finding on the multiplex network (see 88B, Multiplexing).
Check the key using command SC018 "Checking a key".
If the key is allocated, obtain a second key belonging to the vehicle and start the engine.
If the engine starts with the second key, replace the first key with a new key and allocate the new key to the
vehicle using command SC015 "Key allocation".
Carry out fault finding on the multiplex network (see 88B, Multiplexing).
AFTER REPAIRCarry out another fault finding check on the system.
UCH_V44_ALP25
