display MITSUBISHI TRITON 1997 Owner's Manual

SRS ± Post-collision Diagnosis52B-19
POST-COLLISION DIAGNOSIS52400110154
To inspect and service the SRS after a collision (whether
or not the air bag has deployed), perform the following steps.
SRS DIAGNOSIS UNIT MEMORY CHECK
1. Connect the MUT-II to the diagnosis connector (16-pin).
Caution
Turn off the ignition switch before connecting or
disconnecting the MUT-II.
2. Read (and write down) all displayed diagnosis codes.
(Refer to P. 52B-6.)
NOTE
If the battery power supply has been disconnected or
disrupted by the collision, the MUT-II cannot communicate
with the SRS diagnosis unit. Inspect and, if necessary,
repair the body wiring harness before proceeding further.
3. Read the data list (fault duration and how many times
memories are erased) using the MUT-II.
Data list
No.Service Data ItemApplicability
91How long a problem has lastedMaximum time to be stored: 9999 minutes
(approximately 7 days)
92Number indicating houw often the memory is clearedMaximum time to be stored: 250
4. Erase the diagnosis codes and after waiting 5 seconds
or more read (and write down) all displayed diagnosis
codes. (Refer to P.52B-6.)
REPAIR PROCEDURE
WHEN AIR BAG DEPLOYS IN A COLLISION.
1. Replace the following parts with new ones.

SRS diagnosis unit (SDU) (Refer to P. 52B-26.)

Air bag module (Refer to P. 52B-28.)

Front impact sensors (Refer to P. 52B-23.)

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-12
Code No.21 Communication system between MUT-II and
engine-ECUProbable cause
After the ignition switch turned to ON, the confirmation code is not received from
the engine-ECU within allowable time, or an abnormal code is received.
Malfunction of harness or connector

Malfunction of engine-ECU

Malfunction of immobilizer-ECU
Is diagnosis code No.54 displayed from
the engine-ECU?Ye sCheck the engine-ECU power source
and the earth circuit. (Refer to GROUP
13A ± Troubleshooting.)
No
Check the following connectors:
C-19, C-36, C-50NG
Repair
OK
Check trouble symptom.NGCheck the harness between the engine-
ECU and immobilizer-ECU.NG
Repair
OK
Check trouble symptom.
NG
Replace the immobilizer-ECU.
Register the password (secret code)
and ID code. (Refer to P.54-23.)
Check trouble symptom.NGReplace the engine-ECU.
Code No.31 EEPROM abnormality inside immobilizer-
ECUProbable cause
No data has been written to the EEPROM inside the immobilizer-ECU.
Malfunction of immobilizer-ECU
Check trouble symptom.NGReplace the immobilizer-ECU.Register the password (secret code)
and ID code. (Refer to P.54-23.)

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-15
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with MUT-II is impossible
Probable cause
The cause is probably that a malfunction of the diagnosis line or the immobilizer-ECU
ia not functioning.
Malfunction of diagnosis line

Malfunction of harness or connector

Malfunction of immobilizer
Ye sOK
Check trouble symptom.
NG
OK
Check trouble symptom.NG
Check the harness between the immobi-
lizer-ECU and diagnosis connector.NG
Repair
OK
Check the immobilizer-ECU power sup-
ply and earth circuit. (Refer to P.54-17,
Inspection Procedure 5.)
OK
Check trouble symptom.NGReplace the immobilizer-ECU.

Register the password (secret code)
and the ID code. (Refer to P.54-23.)

Register the password (secret code),
reset the code to the factory setting and
register the ID code. (Refer to P.54-23.)
Check the immobilizer-ECU connector
C-36.
(Short-circuited harness wire between
terminal No.14 and No.15)NG
Repair
Can the MUT-II communicate with the
engine-ECU?NoCheck the following connectors:
C-35, C-36NG
Repair
Inspection Procedure 2
ID code cannot be registered using the MUT-II
Probable cause
The cause is probably that there is no ID code registered in the immobilizer-ECU
or there is a malfunction of the immobilizer-ECU.
Malfunction of transponder

Malfunction of ignition key ring antenna

Malfunction of harness or connector

Malfunction of immobilizer-ECU
No ignition key can be registered.NoReplace the ignition key that cannot be
registered.Re-register the ID code.
(Refer to P.54-23.)
Ye s
Is a diagnosis code displayed?Ye sTo INSPECTION CHART FOR DIAG-
NOSIS CODE. (Refer to P.54-10, 13.)
No
Check the immobilizer-ECU power
source and the earth circuit. (Refer to
P.54-17, Inspection Procedure 5.)OKCheck trouble symptom.NGReplace the immobilizer-ECU.

Register the password (secret code)
and the ID code. (Refer to P.54-23.)

Register the password (secret code),
reset the code to the factory setting and
register the ID code. (Refer to P.54-23.)

CHASSIS ELECTRICAL ± Ignition Switch and Immobilizer System54-16
Inspection Procedure 3
Engine does not start (Cranking but no initial combus-
tion).
Probable cause
If the fuel injectors are not operating, there might be a problem with the MPI system
in addition to a malfunction of the immobilizer system.
It is normal for this to occur if an attempt is made to start the engine using a key
that has not been properly registered.
Malfunction of MPI system

Malfunction of immobilizer-ECU
Check the system voltage during crank-
ing
OK:8 V or moreNGCheck the battery.
OK
Is a diagnosis code displayed from the
immobilizer-ECU?Ye sTo INSPECTION CHART FOR DIAG-
NOSIS CODE. (Refer to P.54-10.)
No
Is a diagnosis code displayed from the
engine-ECU?Ye sRefer to GROUP 13A ± Troubleshoot-
ing.
No
Check the starting system. (Refer to
GROUP 13A ± Troubleshooting.)
OK
Check trouble symptom.
NG
Check the immobilizer-ECU power
source and the earth circuit. (Refer to
P.54-17, Inspection Procedure 5.)OKCheck trouble symptom.NGReplace the immobilizer-ECU.
Register the password (secret code)
and the ID code. (Refer to P.54-23.)
Inspection Procedure 4
Engine does not start (Cranking but no initial combus-
tion).
Probable cause
If no fuel injection, there might be a problem with the fuel injection system in addition
to a malfunction of the immobilizer system.
It is normal for this to occur if an attempt is made to start the engine using a key
that has not been properly registered.
Malfunction of diesel fuel injection system

Malfunction of immobilizer-ECU
Check the system voltage during crank-
ing
OK:8 V or moreNGCheck the battery.
OK
Is a diagnosis code displayed from the
immobilizer-ECU?Ye sTo INSPECTION CHART FOR DIAG-
NOSIS CODE. (Refer to P.54-13.)
No
Check the diesel fuel injection system.
(Refer to GROUP 13E ± On-vehicle Ser-
vice.)
OK
Check the immobilizer-ECU power sup-
ply and the earth circuit. (Refer to
P.54-17, Inspection Procedure 5.)OKCheck trouble symptom.NGReplace the immobilizer-ECU.
Register the password (secret code),
reset the code to the factory setting and
register the ID code. (Refer to P.54-23.)
Check trouble symptom.
NG
Replace the fuel cut valve controller
(fuel injection pump assembly).

CHASSIS ELECTRICAL ± Multi-Meter54-35
MULTI-METER54300720266
TROUBLESHOOTING
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspection procedure No.Reference page
Actual outside temperature is different from
thermometer.154-35
Outside temperature is not displayed.254-36
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Actual outside temperature is different from thermometer.
Probable cause
The defective internal resistance of the thermo sensor or thermometer may be present.
Malfunction of outside thermo sensor

Malfunction of harness or connector

Malfunction of thermometer
OK
Check trouble symptom.NGCheck the harness between outside
thermo sensor and multi-meter. Repair
if necessary.
OK
Replace the thermometer.
OK
Measure at the multi-meter connector
C-45.

Connect the connector and measure
voltage of the sensor at the following
temperature.

Voltage between terminals (5) ± (13)
OK:3.42 V (when display tempera-
ture is 0C)
2.46 V (when display tempera-
ture is 20C)
1.61 V (when display tempera-
ture is 40C)NGCheck the following connectors:
A-25, C-01, C-44, C-45NG
Repair
Check internal resistance of the thermo
sensor. (Refer to P.54-38.)NG
Replace

CHASSIS ELECTRICAL ± Radio and Tape Player54-77
RADIO AND TAPE PLAYER WITH ANTI-THEFT SYSTEM54400430032

After the power supply to the radio and tape
player has been interrupted for an hour or more,
the anti-theft system will prevent the radio and
tape player from working, even if the powersupply is restored. Problem with the anti-theft
system can be found using the flow chart below.
When the ignition key is in the ACC or ON position and the POWER
button is pressed, does ªCODEº appear on the display?NoCheck and repair the connector or harness.
Ye s
Can the security code be input to the display using the memory
select buttons?NoRepair or replace the radio and tape player.
Ye s
If the BAND button is pressed after security code has been input,
do the radio and tape player then work?Ye sNormal
No
If the security code is not accepted, is ª1 ERRORº displayed for
two seconds and then changes into ªcodeº to wait for the next
input?NoRepair or replace the radio and tape player.
Ye s
If the BAND button are pressed after the security code has been
input again by means of the memory select buttons, do the radio
and tape player then work?Ye sNormal (an incorrect code was input the first time)
No
If the security code is not accepted, is ª2 ERRORº displayed for
two seconds and then changes into ªcodeº to wait for the next
input?NoRepair or replace the radio and tape player.
Ye s
If the BAND button are pressed after the security code has been
input again by means of the memory select buttons, do the radio
and tape player then work?Ye sNormal (an incorrect code was input the second time)
No
If the security code is not accepted, ª3 ERRORº is displayed for
five seconds and then changes into ªOFFº. Then the security code
can not be input any more. To input the security code again, turn
the ignition switch to the ACC or ON position and wait for one
hour when ªOFFº is displayed. After ªOFFº disappears on the display
and changes into ªcodeº, the security code can be input again.

5
TEST 2 SRS WARNING LAMP DOES NOT ILLUMINATE
(1) Read (and write down) all of the displayed diagnosis codes
and service data (fault duration and how many times
memories are erased) using the Multi- use Tester
or MUT-II models>
NOTE
(1) if the Multi-use Tester or Mut-II displays “CAN’T
COMM”. check the Multi-use Tester or MUT-II and
vehicle side diagnosis connector for poor connections
(Refer to P.52B-12.) and perform TEST 4.
(2) Maximum stored period: 9999 minutes (approximately
7 days)
(3) Maximum number of times to be stored: 250
(4) Check diagnosis codes against SELF-DIAGNOSIS QUICK
REFERENCE CHART and perform service indicated there.
SELF-DIAGNOSIS QUICK REFERENCE CHART
After carrying out test 1 or 2, use the following table to repair.
Diagnosis
code No.Explanation Service
- Normal. The SRS is in good order -
11The circuits for the front impact sensor are shorted together, the (-) side of
the harness between the air bag module and the SDU is shorted to the
earth, or the (+) side of the harness between the front impact sensor and
the SDU is shorted to the earthPerform TEST 5 without front passenger’s
air bag> L.H. drive vehicles
refer to P 52B-22
12Right or left impact sensor circuit is open, or the wire from the sensor to the
SDU is open-circuit.R.H. drive vehicles: refer to
P. 52B-26 13Right and left impact sensor circuits are open or the wires from the sensors
to the SDU are open-circuitFront passenger’s air bag>
refer to P.52B-32
21The circuits for the driver’s side air bag module (squib) are shorted together
other or the circuit is earthed.Perform TEST 6 without front passenger’s
air
22The driver’s side air bag module (squib) circuit is open or the wire from the
driver’s side air bag module to the SDU (clock spring) is open circuit, the
harness connection is defective, or the (+) side of the harness between the
driver’s side air bag module and the SDU is shorted to the earth.
Disconnected connector in driver’s side air bag module (squib).
Open-circuit in clock spring due to inappropriate neutral position.bag> L.H. drive vehicles:
refer to P52B-35 R.H. drive
vehicles refer to P.52B-39
passenger’s air bag>: refer
to P.52B-45
24The circuits for the front passenger’s side air bag module (squib) are
shorted together other or the circuit is earthed.Perform TEST 13
(Refer to P.52B-64)
25The front passenger’s side air bag module (squib) circuit is open or the wire
from the front passenger’s side air bag module to the SDU (clock spring) is
open circuit, the harness connection is defective or the (+) side of the
harness between the front passenger’s side air bag module and the SDU is
shorted to the earth.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting52B-14

6
TEST 2 SRS WARNING LAMP DOES NOT ILLUMINATE
(1) Read (and write down) all of the displayed diagnosis codes
and service data (fault duration and how many times
memories are erased) using the Multi-use Tester <1993
models> or MUT-II
NOTE
(1) if the Multi-use Tester or Mut-II displays “CAN’T
COMM”. check the Multi-use Tester or MUT-II and
vehicle side diagnosis connector for poor connections
(Refer to P.52B-10.) and perform TEST 4.
(2) Maximum stored period: 9999 minutes (approximately
7 days)
(3) Maximum number of times to be stored: 250
(4) Check diagnosis codes against SELF-DIAGNOSIS QUICK
REFERENCE CHART and perform service indicated there.
SELF-DIAGNOSIS QUICK REFERENCE CHART
After carrying out test 1 or 2, use the following table to repair.
Diagnosis
code No.Explanation Service
- Normal. The SRS is in good order -
11 The circuits for the front impact sensor are shorted together, the (-) side of
the harness between the air bag module and the SDU is shorted to the
earth, or the (+) side of the harness between the front impact sensor and
the SDU is shorted to the earthPerform TEST 5 without front passenger’s
air bag> refer to P 52B-20
12 Right or left impact sensor circuit is open, or the wire from the sensor to the
SDU is open-circuit.passenger’s air bag>
refer to P.52B-24
13 Right and left impact sensor circuits are open or the wires from the sensors
to the SDU are open-circuit
21 The circuits for the driver’s side air bag module (squib) are shorted together
other or the circuit is earthed.Perform TEST 6 without front passenger’s
air
22 The driver’s side air bag module (squib) circuit is open or the wire from the
driver’s side air bag module to the SDU (clock spring) is open circuit, the
harness connection is defective, or the (+) side of the harness between the
driver’s side air bag module and the SDU is shorted to the earth.
Disconnected connector in driver’s side air bag module (squib).
Open-circuit in clock spring due to inappropriate neutral position.bag> refer to P52B-27
passenger’s air bag>: refer
to P.52B-31
24 The circuits for the front passenger’s side air bag module (squib) are
shorted together other or the circuit is earthed.Perform TEST 13
(Refer to P.52B-47)
25 The front passenger’s side air bag module (squib) circuit is open or the wire
from the front passenger’s side air bag module to the SDU (clock spring) is
open circuit, the harness connection is defective or the (+) side of the
harness between the front passenger’s side air bag module and the SDU is
shorted to the earth.
52B-12SUPPLEMENT RESTRAINT SYSTEM (SRS) - Troubleshooting

10
TROUBLESHOOTING
INSPECTION CHART FOR DIAGNOSIS CODES
Inspect according to the inspection chart that is appropriate for the malfunction code.
Code No. Diagnosis item Reference page
14 Analog G-sensor system in the SRS-ECU -
15, 16 Safing G-sensor system in the SRS-ECU -
21, 22, 61, 62 Driver’s side air bag module (squib) system 52B-5
24, 25, 64, 65 Front passenger’s side air bag module (squib) system 52B-6
31, 32 SRS-ECU capacitor system -
34* Connector lock system -
35 SRS-ECU capacitor system -
41* IG1 (A) power circuit system 52B-7
42* IG1 (B) power circuit system 52B-7
43 SRS warning lamp drive circuit system Lamp does not illuminate. * 52B-7
Lamp does not switch off. -
44 SRS warning lamp drive circuit system -
45 SRS-ECU non volatile memory (EEPROM) and A/D converter system -
51, 52 Driver’s side air bag module (squib ignition drive circuit) system -
54, 55 Front passenger’s side sir bag module (squib ignition drive circuit) system -
NOTE
(1) *: if the vehicle condition return to normal, the diagnosis code will be automatically erased, and the SRS warning
lamp will return to normal.
(2) If the vehicle has a discharged battery it will store the fault codes 41 or 42. When these diagnosis codes are
displayed, check the battery.
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No. 21,22, 61 or 62 Driver’s side air bag module
(squib) systemProbable cause
These diagnosis codes are output if there is abnormal resistance between the
input terminals of the driver’s side air bag module (squib).
The trouble causes for each diagnosis code No. are as follows.·
Malfunction of clock spring
·
Open-circuit in clock spring due to inappropriate neutral
position.
·
Malfunction of wiring harnesses or connectors
·
Malfunction of driver’s side air bag module (squib)
·
Malfunction of SRS-ECU
Code No. Trouble symptoms
21
·
Short in driver’s side air bag module (squib) or harness short
·
Short in clock spring
22
·
Open circuit in driver’s side air bag module (squib) or open harness
·
Open circuit in clock spring
·
Disconnected connector in the driver’s side air bag module (squib).
·
Open circuit in clock spring due to inappropriate neutral position.
·
Malfunction of connector contact
61
·
Short in driver’s side air bag module (squib) harness leading to the power supply
62
·
Short in driver’s side air bag module (squib) harness leading to the earth
52B-5SRS - Troubleshooting

14
TEST 2 SRS WARNING LAMP DOES NOT ILLUMINATE
(1) Read (and write down) all of the displayed diagnosis codes
and service data (fault duration and how many times
memories are erased) using the MUT or MUT-II
NOTE
(1) if the MUT or MUT-II displays “CAN’T COMM”. check
the MUT or MUT-II and vehicle side diagnosis
connector for poor connections (Refer to P.52B-7.) and
perform TEST 6.
(2) Maximum stored period: 9999 minutes (approximately
7 days)
(3) Maximum number of times to be stored: 250
(4) Check diagnosis codes against SELF-DIAGNOSIS QUICK
REFERENCE CHART and perform service indicated there.
SELF-DIAGNOSIS QUICK REFERENCE CHART
After carrying out test 2 or 3, use the following table to repair.
Diagnosis
code No.Explanation Service
- Normal. The SRS is in good order -
14 Analog G sensor output signal is abnormal
Analog G sensor does not function or its characteristic is abnormalReplace the SDU
(Refer to P.52B-34.)
15 The circuits for the safing impact sensor are shorted together or the circuit
is earthed
16 The safing input sensor circuit is open or the wire from the air module to the
SDU is open circuit
21 The circuits for the air bag module (squib) are shorted together other or the
circuit is earthed.Perform TEST 7
22 The air bag module (squib) circuit is open or the wire from the air bag
module to the SDU (clock spring) is open circuit, the harness connection is
defective, or the (+) side of the harness between the air bag module and
the SDU is shorted to the earth.
Disconnected connector in driver’s side air bag module (squib).
Open-circuit in clock spring due to inappropriate neutral position.
31 The DC/DC converter (integrated in the SDU) terminal voltage is higher
than the specified value for 5 seconds.Replace the SDU
(Refer to P.52B-34.)
52B-9SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting