alternator RENAULT TWINGO RS 2009 2.G Engine And Peripherals Passenger Compartment Connection Unit OBD User Guide

87B-83
MR-413-X44-87B000$480.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check87B
SUB-FUNCTION: ALTERNATOR
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application condition: engine stopped, + after ignition feed present.
FunctionParameter or Status
Checked or ActionDisplay and notes Fault finding
Battery voltagePR073:Alternator charge
signalIndicates the
alternator charge in V.In the event of a fault, apply the
interpretation of parameter PR073.
Alternator
setpointPR075:Alternator setpoint
voltage
Indicates the alternator
setpoint in V.In the event of a fault, apply the
interpretation of parameter PR075.
Battery voltagePR001:Battery voltage9 V < X < 16 VIn the event of a fault, run fault finding
on the charging circuit (see, 80A
Battery), run fault finding on the
multiplex network (see 88B,
Multiplex) and run fault finding on the
injection (see 13B, Diesel injection
or 17B, Petrol injection).
EnginePR024:Engine coolant
temperature˚C
PR025:Engine speedrpmIn the event of a fault, run fault finding
on the multiplex network (see 88B,
Multiplex) and run fault finding on the
injection (see 13B, Diesel injection
or 17B, Petrol injection).
ET142:Engine operating
phaseSTOPPED
STARTING
RUNNING
STALLEDIn the event of a fault, apply the
interpretation of status ET142.
AlternatorAC130:Alternator regulationIndicates the
regulation of the
alternator in volts.In the event of a fault, run fault finding
on the charging circuit (see 80A,
Battery).

87B -144
MR-413-X44-87B000$672.mif
V5
87B
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Parameter summary table
Tool parameter Diagnostic tool title
PR002External temperature
PR056Number of keys allocated
PR073Alternator charge signal
PR074Battery setpoint voltage
PR075Alternator setpoint voltage
PR076Battery voltage after rest
MR-413-X44-87B000$672.mif
UCH
Vdiag No.: 44

87B -147
MR-413-X44-87B000$720.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of parameters
UCH
Vdiag No.: 44
87B
PR073
ALTERNATOR CHARGE SIGNAL
NOTESNo faults should be present or stored.
Note:
In the event of a malfunction, the value will by 99.6% (engine running).
Depending on the battery charge status, the operating phase and the battery temperature, the UCH determines
what the voltage across the battery terminals should be.
When the battery charge drops, and PR076 Battery voltage after rest decreases, the UCH can temporarily
increase the PR075 Alternator setpoint voltage by 1 V and for a period of 15 minutes after switching on + after
ignition feed.
Before and during starting, PR075 Alternator setpoint voltage is fixed at 10.7 V.
A maximum of 30 seconds after the engine has started, the UCH sets PR075 Alternator setpoint voltage to the
optimum value calculated.
The injection computer can also control the alternator (component code 103) regulation voltage.
The injection computer sends the maximum authorised power delivered by the engine, to the UCH via the
multiplex network.
If the power available by the engine is less than the power consumed by the alternator (component code 103),
the UCH reduces PR075 Alternator setpoint voltage.
0 % < PR073 < 100 %
In the event of a fault, carry out a complete check on the battery and the charging circuit (see Technical Note
16A, Starting-Charging).
If the fault is still present, contact Techline.
AFTER REPAIRRepeat the conformity check from the start.
UCH_V44_PR073

87B -148
MR-413-X44-87B000$720.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of parameters
UCH
Vdiag No.: 44
87B
PR074
BATTERY SETPOINT VOLTAGE
NOTESNo faults should be present or stored.
Depending on the battery charge status, the operating phase and the battery temperature, the UCH determines
what the voltage across the battery terminals should be.
When the battery charge drops, and PR076 Battery voltage after rest decreases, the UCH can temporarily
increase the PR075 Alternator setpoint voltage by 1 V and for a period of 15 minutes after switching on + after
ignition feed.
Before and during starting, PR075 Alternator setpoint voltage is fixed at 10.7 V.
A maximum of 30 seconds after the engine has started, the UCH sets PR075 Alternator setpoint voltage to the
optimum value calculated.
The injection computer can also control the alternator (component code 103) regulation voltage.
The injection computer sends the maximum authorised power delivered by the engine, to the UCH via the
multiplex network.
If the power available by the engine is less than the power consumed by the alternator (component code 103),
the UCH reduces PR075 Alternator setpoint voltage.
In the event of a fault, perform a complete check on the battery and charging circuit (see 80A, Battery).
If the fault is still present, contact Techline.
AFTER REPAIRRepeat the conformity check from the start.
UCH_V44_PR074

87B -149
MR-413-X44-87B000$720.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of parameters
UCH
Vdiag No.: 44
87B
PR075
ALTERNATOR SETPOINT VOLTAGE
NOTESNo faults should be present or stored.
Depending on the battery charge status, the operating phase and the battery temperature, the UCH determines
what the voltage across the battery terminals should be.
When the battery charge drops, and PR076 Battery voltage after rest decreases, the UCH can temporarily
increase the PR075 Alternator setpoint voltage by 1 V and for a period of 15 minutes after switching on + after
ignition feed.
Before and during starting, PR075 Alternator setpoint voltage is fixed at 10.7 V.
A maximum of 30 seconds after the engine has started, the UCH sets PR075 Alternator setpoint voltage to the
optimum value calculated.
The injection computer can also control the alternator (component code 103) regulation voltage.
The injection computer sends the maximum authorised power delivered by the engine, to the UCH via the
multiplex network.
If the power available by the engine is less than the power consumed by the alternator, the UCH reduces PR075
Alternator setpoint voltage.
In the event of a fault, perform a complete check on the battery and charging circuit (see 80A, Battery).
If the fault is still present, contact Techline.
AFTER REPAIRRepeat the conformity check from the start.
UCH_V44_PR075

87B -173
MR-413-X44-87B000$912.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Fault Finding Chart
UCH
Vdiag No.: 44
87B
ALP 30 Low light intensity
NOTESCheck the battery voltage (see 80A Battery).
Check for faults using the diagnostic tool. Deal with the other faults first.
With the engine running at idle speed, run command AC130 Alternator regulation.
–Wait 20 seconds.
–For 10 seconds the voltage of the alternator (component code 103) should be equal to 15 V ± 0.2 V, when
using a multimeter to measure on connection BPDA between components 103 and 645.
–Wait 20 seconds.
–For 10 seconds the voltage of the alternator (component code 103) must be equal to 13 V ± 0.2 V when
measuring between the alternator terminal (component code103) and the earth on connection 2N using a
multimeter.
If the values measured are not correct, check the starting - charging circuit (see 16A Starting - Charging) and
check the battery (see 80A, Battery).
If the fault is still present, contact the Techline.
AFTER REPAIRCarry out a complete check using the diagnostic tool.
UCH_V44_ALP30