13B-445V12 MR-372-J84-13B300$150.mif
DIESEL INJECTION
Fault finding – Interpretation of commands13B
AC037
CONTINUED
STEP 2:
Check the connections of the preheating unit, component code 257, the heater plugs, component codes 680, 681,
682 and 683 and the injection computer, component code 120.
Measure the resistance of the heater plugs. If the resistance value is > 2 Ω, replace the faulty plug or plugs,
making sure that the correct plug type, slow or fast, is fitted on the vehicle.
Check the continuity and absence of interference resistance of the following connections:
•37AB between components 257 and 683,
•37AA between components 257 and 680,
•37Z between components 257 and 681,
•37AC between components 257 and 682.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check the condition of the preheating unit supply fuse (70 A) (see MR 364 (Mégane II ph2), MR 370 (Scénic II
ph2), MR 395 (Laguna II ph2), 402 (Vel Satis ph2), 405 (Espace IV ph2) Mechanical, 81C, Fuses, Fuses: List
and location of components).
Check the + 12 V battery supply to the preheating unit on the following connection:
•BP35 of component 257.
Check the continuity and absence of interference resistance of the following connections:
•3FY between components120 and 257,
•3FF between components120 and 257.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If the fault is still present, replace the preheating unit.
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
13B-448V12 MR-372-J84-13B300$150.mif
DIESEL INJECTION
Fault finding – Interpretation of commands13B
AC064THERMOPLUNGER No. 2 RELAY
NOTESThere must be no present or stored faults.
Perform this fault finding procedure if there is a fault with the passenger compartment
heating - demisting.
Consult the "Wiring diagrams" Technical Note to locate the relevant fuses and relays.
Special notes:
The thermoplunger no. 2 relay or the additional heater interface unit supplies
thermoplungers 2 and 3 in parallel.
Use the Wiring Diagram Technical Note, Laguna II ph2, Vel Satis ph2, Espace IV
ph2, Mégane II ph2, Scénic II ph2.
If the thermoplunger no. 2 relay does not operate during command AC064.
Check the condition of the thermoplunger 2 relay mounting on the engine fuse box or the additional heater
interface unit (see Wiring Diagram Technical Note, Vehicle, component code 1068 or 1550).
Check the condition of the engine management computer connector (see Wiring Diagram Technical Note,
Vehicle, component code 120).
If the connector or connectors are faulty and if there is a repair procedure (see Technical Note 6015A, Repairing
electrical wiring, Wiring: Precautions for repair), repair the connector, otherwise replace the wiring.
if the fault is still present, check as follows that this relay is controlled by the engine management computer:
Disconnect the thermoplunger no. 2 relay, fit a 50 Ω to 100 Ω resistor on its mounting instead of the coil, and
connect a voltmeter as follows:
– positive terminal to + 12 V battery,
– negative terminal on connection 3JAA of component 1068 or 1550.
Run command AC064.
If the voltmeter shows the battery voltage (4 ON-OFF cycles of 10 seconds), replace the thermoplunger no. 2
relay.
If the voltmeter does not show the battery voltage (4 ON-OFF cycles of 10 seconds), contact the Techline.
EDC16CP33_V18_AC064 / EDC16CP33_V1C_AC064 / EDC16CP33_V54_AC064 / EDC16CP33_V20_AC064 / EDC16CP33_V58_AC064 /
EDC16CP33_V5C_AC064 / EDC16CP33_V24_AC064 / EDC16CP33_V04_AC064 / EDC16CP33_V08_AC064 / EDC16CP33_V44_AC064 /
EDC16CP33_V4C_AC064 / EDC16CP33_V34_AC064 / EDC16CP33_V38_AC064 / EDC16CP33_V74_AC064 / EDC16CP33_V28_AC064 /
EDC16CP33_V62_AC064 / EDC16CP33_V26_AC064 / EDC16CP33_V60_AC064
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
