Mitsubishi Lancer Evolution VI. Manual - part 91

 

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Mitsubishi Lancer Evolution VI. Manual - part 91

 

 

SRS  – 

Troubleshooting

52B-10

Code No.34 Connector lock system

Probable cause

This diagnosis code is output if a poor connection of the SRS-ECU is detected. However,
if the vehicle condition returns to normal, diagnosis code No.34 will be automatically
erased, and the SRS warning lamp will switch off.

D

Malfunction of connectors

D

Malfunction of SRS-ECU

Is B51 SRS-ECU connector correctly connected?

Yes

No

Repair

Check the following connector:
B-51

OK

Replace the SRS-ECU.

Replace

NG

Code No.35 SRS-ECU (deployed air bag) system

Probable cause

This diagnosis code is output after the air bag deploys. If this code is output before
the air bag has deployed, the cause is probably a malfunction inside the SRS-ECU.

D

Malfunction of SRS-ECU

Replace the SRS-ECU.

Code No.41 IG

1

 (A) power circuit system

Probable cause

This diagnosis code is output if the voltage between the IG

1

 (A) terminal and the

earth is lower than the specified value for a continuous period of 5 seconds or more.
However, if the vehicle condition returns to normal, diagnosis code No.41 will be
automatically erased, and the SRS warning lamp will switch off.

D

Malfunction of wiring harnesses or connectors

D

Malfunction of SRS-ECU

Measure at SRS check harness
connector (5).

D

Disconnect SRS-ECU 
connector B-51.

D

Connect SRS check 
harness connector (3).

D

Continuity between 
terminals (20)
OK: Continuity

NG

Check the following
connectors:
B-51, B-78, B-80

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between the SRS-ECU and earth, and
repair if necessary.

OK

Measure at SRS check harness connector (5).

D

Disconnect SRS-ECU connector B-51.

D

Connect SRS check harness connector (3).

D

Ignition switch: ON

D

Voltage between terminal (14) and body earth
OK: 9 V or more

NG

Check the following
connectors:
B-51, B-78

NG

Repair

OK

Check trouble symptoms.

NG

Check the harness wire between the SRS-ECU and ignition switch
IG

1

, and repair if necessary.

OK

Replace the SRS-ECU.

SRS check harness
(MB991613)

3

5

SRS  – 

Troubleshooting

52B-11

Code No.42 IG

1

 (B) power circuit system

Probable cause

This diagnosis code is output if the voltage between the IG

1

 (B) terminal and the

earth is lower than the specified value for a continuous period of 5 seconds or more.
However, if the vehicle condition returns to normal, diagnosis code No.42 will be
automatically erased, and the SRS warning lamp will switch off.

D

Malfunction of wiring harnesses or connectors

NG

Check the harness wire between the SRS-ECU and ignition switch
IG

1

, and repair if necessary.

OK

Check trouble symptoms.

OK

Replace the SRS-ECU.

OK

Measure at SRS check harness connector (5).

D

Disconnect SRS-ECU connector B-51.

D

Connect SRS check harness connector (3).

D

Ignition switch: ON

D

Voltage between terminal (13) and body earth
OK: 9 V or more

NG

Check the following
connectors:
B-51, B-78

NG

Repair

NG

Check the harness wire between the SRS-ECU and earth, and
repair if necessary.

OK

Check trouble symptoms.

Measure at SRS check harness
connector (5).

D

Disconnect SRS-ECU 
connector B-51.

D

Connect SRS check 
harness connector (3).

D

Continuity between 
terminals (20)
OK: Continuity

NG

Check the following
connectors:
B-51, B-78, B-80

NG

Repair

SRS check harness
(MB991613)

3

5

SRS  – 

Troubleshooting

52B-12

Code No.43 SRS warning lamp drive circuit system 
(Lamp does not illuminate.)

Probable cause

This diagnosis code is output when an open circuit occurs for a continuous period
of 5 seconds while the SRS-ECU in monitoring the SRS warning lamp and the lamp
is OFF (transistor OFF).
However, if this code is output due to an open circuit, if the vehicle condition returns
to normal, this diagnosis code No.43 will be automatically erased, and the SRS warning
lamp will return to normal.

D

Malfunction of wiring harnesses or connectors

D

Blown bulb

D

Malfunction of SRS-ECU

D

Malfunction of combination meter

OK

Replace the combination
meter.

NG

Check the harness wire
between the SRS-ECU
and ignition switch (IG

1

).

NG

Repair

OK

Check trouble symptoms.

OK

Check the following
connectors:
B-51, B-09, B-08, B-75,
B-76

NG

Repair

NG

Check the harness wire between the SRS-ECU and earth, and
repair if necessary.

OK

Check trouble symptoms.

Measure at SRS check harness
connector (5).

D

Disconnect SRS-ECU 
connector B-51.

D

Connect SRS check 
harness connector (3).

D

Continuity between 
terminals (20)
OK: Continuity

NG

Check the following
connectors:
B-51, B-78, B-80

NG

Repair

OK

Measure at SRS check harness connector (5).

D

Disconnect SRS-ECU connector B-51.

D

Connect SRS check harness connector (3).

D

Ignition switch: ON

D

Connect terminal (15) to the body earth.
OK: Lamp illuminates

NG

Blown bulb inspection

NG

Repair

OK

Replace the SRS-ECU.

SRS check harness
(MB991613)

3

5

Code No.43 SRS warning lamp drive circuit system
(Lamp does not switch off.)

Probable cause

This diagnosis code is output when a short to earth occurs in the harness between
the lamp and the SRS-ECU while SRS-ECU is monitoring the SRS warning lamp
and the lamp is ON.

D

Malfunction of wiring harnesses or connectors

D

Malfunction of SRS-ECU

D

Malfunction of combination meter

SRS warning lamp inspection

D

Ignition switch: ON

D

Does lamp switch off when SRS-ECU connector B-51 is
disconnected?

No

Check the following
connectors:
B-51, B-09

NG

Repair

Yes

Replace the SRS-ECU.

OK

Check trouble symptoms.

NG

Check the harness wire
between the SRS-ECU
and combination  meter,
and repair if necessary.

SRS  – 

Troubleshooting

52B-13

Code No.44 SRS warning lamp drive circuit system

Probable cause

This diagnosis code is output when a short occurs in the lamp drive circuit or a
malfunction of the output transistor inside the SRS-ECU is detected while the SRS-ECU
is monitoring the SRS warning lamp drive circuit.

D

Malfunction of wiring harnesses or connectors

D

Malfunction of SRS-ECU

Check the SRS warning lamp drive circuit system. 
(Refer to P.52B-12)

OK

Replace the SRS-ECU.

Code No.45 SRS-ECU non-volatile memory (EEPROM)
and A/D converter system

Probable cause

This diagnosis code is output if there is a malfunction in the SRS-ECU non-volatile
memory (EEPROM) and A/D converter.

D

Malfunction of SRS-ECU

Code No.

Trouble symptom

45

Non-volatile memory 
(EEPROM)

D

Non-volatile memory (EEPROM) is abnormal.

Replace the SRS-ECU.

Code No.51 or 52 Driver’s side air bag module (squib
ignition drive circuit) system

Probable cause

This diagnosis code is output if a short (No.51) or an open circuit (No.52) is detected
in the circuit for the driver’s seat.

D

Malfunction of SRS-ECU

Code No.

Trouble symptom

51

Driver’s side air bag module
(squib ignition drive circuit)

D

Short circuit in the squib ignition drive circuit

52

(squib ignition drive circuit)

D

Open circuit in the squib ignition drive circuit

Replace the SRS-ECU.

Code No.54 or 55 Front passenger’s side air bag module
(squib ignition drive circuit) system

Probable cause

This diagnosis code is output if a short (No.54) or an open circuit (No.55) is detected
in the circuit for the passenger’s seat.

D

Malfunction of SRS-ECU

Code No.

Trouble symptom

54

Front passenger’s side air
bag module (squib ignition

D

Short circuit in the squib ignition drive circuit

55

bag  module  (squib  ignition
drive circuit)

D

Open circuit in the squib ignition drive circuit

Replace the SRS-ECU.

 

 

 

 

 

 

 

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