MITSUBISHI TRITON 1997 Workshop Manual

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

1
5 Short c ir c u it in th e s a fin g G -s e nso r 1
6 Open c ir c u it in th e s a fin g G -s e nso r R
epla ce th e S R S-E C U 2
1
·
Short in d riv e r’s s id e a ir b ag m odule ( s q uib ) o r h arn ess s h ort
·
Short in c lo ck s p rin g 2
2
·
Open c ir c u it in d riv e r’s s id e a ir b ag m odule ( s q uib ) o r o pen h arn ess
·
Open c ir c u it in c lo ck s p rin g
·
Dis co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib ).
·
Open c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n.
·
Malf u nctio n o f c o nnecto r c o nta ct 6
1
·
Short in d riv e r’s s id e a ir b ag m odule ( s q uib ) h arn ess le adin g to th e p ow er s u pply 6
2
·
Short in d riv e r’s s id e a ir b ag m odule ( s q uib ) h arn ess le adin g to th e e arth N
G C
heck th e c lo ck s p rin g ( R efe r to P .5 2B -3 0.) R
epair R
epla ce th e d riv e r’s s id e a ir b ag m odule N
o
O K <
A dded > <
A dded >

2
. R em ove t h e S D U c o nnecto r lo ck b y t h e f o llo w in g p ro ced ure .
If t h ere is n o n otc h in t h e c o nnecto r lo ck le ver ( T yp e 1 ).
P la ce a ( -) s cre w driv er a g ain st t h e lo ck s p rin g ( m eta l s ectio n) o f t h e
c o nnecto r lo ck le ver a s s h ow n in t h e illu str a tio n, a n d p ush t h e
s p rin g h oriz o nta lly t o w ard t h e in sid e o f t h e u nit .
( 1 ) D o n ot u se e xcessiv e f o rc e t o r a is e t h e lo ck le ver.
( 2 ) D o n ot in sert t h e s cre w driv er in to t h e g ap b etw een t h e lo ck
l e ver a n d t h e lo ck s p rin g.
5
2B -1 3 S
R S - T ro uble sh ootin g 2
1 ·
S
hort in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r h arn ess s h ort
· S
hort in c lo ck s p rin g
· S
hort in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r fr o nt im pact s e nso r
h arn esse s le adin g to th e p ow er s u pply 2
2 ·
O
pen c ir c u it in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r o pen h arn ess
· D
is co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib )
· O
pen-c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n
· M
alf u nctio n o f c o nnecto r c o nta ct
· S
hort in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r fr o nt im pact s e nso r
h arn esse s le adin g to th e p ow er s u pply S
hort Open c ir c u it
( 1 s e nso r) O
pen c ir c u it
( 2 s e nso rs ) A
ir b ag m odule Short 11 o r 2 1 12 o r 2 1 13 o r 2 1 (
d riv e r’s s id e s q uib ) Open c ir c u it 11 o r 2 2 12 o r 2 2 13 o r 2 2

C
ode N o. 2 1,2 2 A ir b ag m odule ( D riv er’s s id e s q uib ) s yste m Pro bab le c au se 2
1
·
Short in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r h arn ess s h ort
·
Short in c lo ck s p rin g 2
2
·
Open c ir c u it in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r o pen h arn ess
·
Open c ir c u it in c lo ck s p rin g
·
Dis co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib ).
·
Open c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n.
·
Malf u nctio n o f c o nnecto r c o nta ct 6
1
·
Short in a ir b ag m odule ( d riv e r’s s id e s q uib ) h arn ess le adin g to th e p ow er s u pply 6
2
·
Short in a ir b ag m odule ( d riv e r’s s id e s q uib ) h arn ess le adin g to th e e arth N
G C
heck th e c lo ck s p rin g ( R efe r to P .5 2B -1 7.) R
epair R
epla ce th e d riv e r’s s id e a ir b ag m odule N
o
O K <
A dded >

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

15
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSTIC TROUBLE
Code No. 14 Analog G-sensor system in the SDU Probable cause
(Comment)
The SDU monitors the output of the analog G sensor inside the SDU. It outputs this
code when any of the following are detected
·
When the analog G sensor is not operating
·
When the characteristics of the analog G sensor are abnormal·
Malfunction of SDU
The cause is probably a malfunction of the analog G-sensor inside the SDU, so replace the SDU
Code No. 15 or 16Safing G-sensor system in the SDU Probable cause
(Comment)
This code is output if the resistance between the terminals of the safing G sensor
inside the SDU is different from normal.
The trouble causes for each diagnosis code No. are as follows·
Malfunction of SDU
Code No. Trouble symptom
15 Short circuit in the safing G-sensor
16 Open circuit in the safing G-sensor
Code No. 21 or 22 Driver’s side Air bag module (squib) system Probable cause
(Comment)
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the air bag module (driver’s side squib).
The trouble causes for each code No. are as follows·
Malfunction of clock spring
·
Open-circuit in clock spring due to inappropriate neutral
position
·
Malfunction of harnesses or connectors
·
Malfunction of air bag module (driver’s side squib)
·
Malfunction of SRS-ECU
Code No. Trouble Symptom
21·
Short in air bag module (driver’s side squib) or harness short
·
Short in clock spring
22·
Open circuit in Air bag module (driver’s side squib) or 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
SRS - Troubleshooting52B-8

2
1
·
Short in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r h arn ess s h ort
·
Short in c lo ck s p rin g 2
2
·
Open c ir c u it in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r o pen h arn ess
·
Open c ir c u it in c lo ck s p rin g
·
Dis co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib ).
·
Open c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n.
·
Malf u nctio n o f c o nnecto r c o nta ct 6
1
·
Short in a ir b ag m odule ( d riv e r’s s id e s q uib ) h arn ess le adin g to th e p ow er s u pply N
G C
heck th e c lo ck s p rin g R
epair R
epla ce th e d riv e r’s a ir b ag m odule N
o
O K <
A dded >
<
A dded >

C
ode N o. 2 1 o r 2 2 A ir b ag m odule ( D riv er’s s id e s q uib ) s yste m Pro bab le c au se 2
1
·
Short in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r h arn ess s h ort
·
Short in c lo ck s p rin g 2
2
·
Open c ir c u it in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r o pen h arn ess
·
Open c ir c u it in c lo ck s p rin g
·
Dis co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib ).
·
Open c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n.
·
Malf u nctio n o f c o nnecto r c o nta ct S
hort O
pen c ir c u it
( 1 s e nso r) O
pen c ir c u it
( 2 s e nso rs ) A
ir b ag m odule ( d riv e r’s s id e s q uib ) Short 11 o r 2 1 12 o r 2 1 13 o r 2 1 O
pen c ir c u it 11 o r 2 2 12 o r 2 2 13 o r 2 2 i
n ju ry
3 . T o u nlo ck t h e S D U c o nnecto r, p la ce a f la t-tip ped
s cre w driv er a g ain st t h e lo ck s p rin g a t t h e lo ck le ver n otc h
a n d p ush t h e s p rin g t o w ard t h e u nit . In t h is c ase, d o n ot
f o rc e t h e lo ck le ver u p.
S
U PPLE M EN TA L R ESTR AIN T S YSTE M ( S R S) - T ro uble sh ootin g
52B -9 <
A dded >
I n su la tin g ta pe
Batte ry
B atte ry ( -) c a ble
A19Z 0001
L ock le ve r
L ock s p rin g
A19W 0018

1
5 Short c ir c u it in th e s a fin g G -s e nso r 1
6 Open c ir c u it in th e s a fin g G -s e nso r R
epla ce th e S R S-E C U 2
1
·
Short in d riv e r’s s id e a ir b ag m odule ( s q uib ) o r h arn ess s h ort
·
Short in c lo ck s p rin g 2
2
·
Open c ir c u it in d riv e r’s s id e a ir b ag m odule ( s q uib ) o r o pen h arn ess
·
Open c ir c u it in c lo ck s p rin g
·
Dis co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib ).
·
Open c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n.
·
Malf u nctio n o f c o nnecto r c o nta ct N
G C
heck th e c lo ck s p rin g ( R efe r to P .5 2B -1 5.) R
epair R
epla ce th e d riv e r’s s id e a ir b ag m odule 9
S 033 N
o
O K <
A dded >

3
. P la ce a fla t- tip ped ( -) s cre w driv e r a gain st th e lo ck s p rin g ( m eta l p ortio n)
o f th e S D U c o nnecto r lo ck le ve r, a nd p ush th e s p rin g h oriz o nta lly to w ard
t h e in sid e o f th e u nit .
C au tio n
1 . D o n ot u se e xcessiv e f o rc e t o r a is e t h e lo ck le ver ( g re en )
2 . d o n ot in sert t h e s cre w driv er in to t h e g ap b etw een t h e lo ck le ver
( g re en ) a n d t h e lo ck s p rin g ( m eta l p ortio n).
4 . D is co nnect th e r e d 1 4-p in c o nnecto r fr o m th e S D U.
S
R S - T ro uble sh ootin g
52B -1 0 2
1 ·
S
hort in a ir b ag m odule ( s q uib ) o r h arn ess s h ort
· S
hort in c lo ck s p rin g
· S
hort in a ir b ag m odule ( s q uib ) o r fr o nt im pact s e nso r h arn esse s
l e adin g to th e p ow er s u pply 2
2 ·
O
pen c ir c u it in a ir b ag m odule ( d riv e r’s s id e s q uib ) o r o pen h arn ess
· O
pen c ir c u it in c lo ck s p rin g
· D
is co nnecte d c o nnecto r in th e d riv e r’s s id e a ir b ag m odule ( s q uib )
· O
pen-c ir c u it in c lo ck s p rin g d ue to in appro pria te n eutr a l p osit io n
· M
alf u nctio n o f c o nnecto r c o nta ct
· S
hort in a ir b ag m odule ( s q uib ) o r fr o nt im pact s e nso r h arn esse s
l e adin g to th e p ow er s u pply S
hort Open c ir c u it
( 1 s e nso r) O
pen c ir c u it
( 2 s e nso rs ) A
ir b ag m odule Short 11 o r 2 1 12 o r 2 1 13 o r 2 1 (
s q uib ) Open c ir c u it 11 o r 2 2 12 o r 2 2 13 o r 2 2