13B-146V1 MR-376-X76-13B000$130.mif
DIESEL INJECTION
Fault finding – Command summary table13B
DCM 1.2 Injection
Program no.: 4C
Vdiag No.: 08
Tool
commandDiagnostic tool title Comments
AC029 High pressure circuit sealing testActivating this will request the injection system to detect a
leak on the high pressure circuit after a procedure has been
carried out. This is activated with the engine warm and
running and consists of unladen acceleration repeated 4
times.
AC056 Power-assisted steering
assembly relayActivating this actuates the power assisted steering pump.
AC060 Preheating warning lightActivating this actuates the preheating warning light on the
instrument panel.
AC061 Overheating warning light.Activating this actuates the engine overheating warning light
on the instrument panel.
AC068Injection fault warning light.Activating this actuates the injection fault warning light on
the instrument panel.
AC099Deactivation of electrical
consumersThis activation only deactivates the preheating function.
AC100End deactivation of electrical
consumersActivating this enables preheating to be authorised after the
injection computer has been programmed or reprogrammed
(see Replacement of components).
AC153 High-speed fan assemblyActivating this actuates the high speed fan relay to test the
supply to the high speed fan.
AC154 Fan low speed.Activating this actuates the low speed fan relay to test the
supply to the low speed fan.
AC155MIL warning lightThis activation controls the malfunction indicator light on the
instrument panel (emission control/EOBD warning light).
AC180 Air conditioning compressor
relay control.Activating this enables you to listen to the operation of the
air conditioning compressor.
AC212 New pump chamber fillingThis must only be activated after the high pressure pump
has been replaced (see Replacement of components).
This command is used to activate the pump repriming
sequence.
AC250 Heating resistor 1 relay.Activating this controls the heating resistor no. 1 relay to test
the heating resistor supply.
13B-187V1 MR-376-X76-13B000$160.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program no.: 4C
Vdiag No.: 08
TEST 1 Low pressure circuit check
Check the conformity of the low pressure circuit
connections
Are the low pressure circuit connections correct? Carry out the necessary repairs.
Check the condition of the priming bulb, and that it is
working properly.
Look for leaks at the unions.
Are there leaks from the hoses and unions? Carry out the necessary repairs
Check that there are no air bubbles in the diesel fuel. Bleed the low-pressure circuit.
Place a container under the filter.
– Disconnect the return hose from the filter
and plug the filter.
– Pump using the priming bulb until there is no
air left.
– Reconnect the return hose immediately. Check if there are air bubbles in the low pressure
circuit.
Low pressure circuit correct.
NO
YES
YES
NO
YES
NO
DCM1.2_V08_TEST01
13B-194V1 MR-376-X76-13B000$160.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program no.: 4C
Vdiag No.: 08
TEST 8 Injector return flow
NOTESSpecial note:
Certain faults make it impossible to carry out this test - deal with these first.
Does the engine start?
Command AC029 High pressure circuit sealing also checks the return volume of each injector to detect any
leaks around the injectors.
Be careful with any objects (tool or other) on the engine housing during the four cycles of the operation
(possible vibrations).
Tooling required
–Mot. 1711 Injector flow measuring kit.
Or: Use four pipes with internal diameter 4mm and approximately 50 cm in length, and four graduated
measuring cylinders.
Procedure
– Ensure that the engine coolant temperature is above 60°C,
– switch off the ignition,
– disconnect the return pipes from the four injectors,
– cap the pump venturi tube to prevent the low-pressure circuit from depriming,
– connect the four transparent tubes in place of the return pipes,
– put the other ends of the four pipes into four graduated measuring cylinders.
NOA
YES
DCM1.2_V08_TEST08
13B-197V1 MR-376-X76-13B000$160.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program no.: 4C
Vdiag No.: 08
TEST 8
CONTINUED 3
If the engine does not start, only the static leakage can be measured, i.e. the leakage with the injector closed, not
actuated and under high pressure.
Make sure that the ignition circuit is working correctly (minimum engine speed 200 rpm).
Tooling required
–Mot. 1711 Injector flow measuring kit.
Or: Use 4 pipes with internal diameter 4mm and approximately 50 cm in length, and a test adapter (TEST
IMV).
Procedure
– Switch off the ignition,
– disconnect the return pipes from the four injectors,
– cap the pump venturi tube to prevent the low-pressure circuit from depriming,
– connect the four transparent pipes in place of the return pipes (Mot. 1711),
– disconnect the low pressure actuator from the pump (brown IMV connector) and connect a test IMV or the Mot.
1711,
– electrically disconnect the four injectors,
– switch on the ignition and engage the starter for 5 seconds,
– measure the amount of diesel fuel in each pipe.
If the return leakage is greater than 10 cm, replace the injector(s) (see MR 388 (Logan/Sandero) or MR 451
(Duster), MR 423 (Thalia 2/Symbol 2) or MR 374 (Kangoo VLL), Mechanical, 13B, Diesel injection, Diesel
injector: Removal - Refitting).
Switch off the ignition, and reconnect the four injectors electrically.
Disconnect the test low pressure actuator and reconnect the low pressure actuator connector to the pump.
Disconnect the four transparent tubes and reconnect the injectors return circuit. Switch on the ignition again, and
clear the injection faults using the diagnostic tool.
A
