sensor MITSUBISHI TRITON 1997 Repair Manual

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

9
TROUBLESHOOTING35201110501
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points
NOTES WITH REGARD TO DIAGNOSIS
The Phenomena listed in the following table are not abnormal.
Phenomenon Explanation of phenomenon
System check sound When starting the engine, a thudding sound can sometimes be hear
coming from inside the engine compartment, but this is because the
system operation check is being performed, and is not an abnormality.
ABS operation sound 1.
Sound of the motor inside the ABS hydraulic unit operation (whine).
2.
Sound is generated along with vibration of the brake pedal (scraping)
3.
When ABS operates, sound is generated from the vehicle chassis
due to repeated brake application and release.
(Thump: suspension: squeak: tyres)
ABS operation (Long braking
distance)For road surfaces suck as snow-covered roads a gravel roads, the
braking distance for vehicles with ABS can sometimes be longer than
that for other vehicles. Accordingly, advise the customer to drive safely
on suck roads by lowering the vehicle speed and not being to
overconfident.
Diagnosis detection condition can vary depending on the diagnosis code.
Make sure that checking requirements listed in the “Comment” are satisfied when checking the trouble
symptom again.
DIAGNOSIS FUNCTION35201120351
DIAGNOSIS CODES CHECK
Read a diagnosis code by the MUT-II or ABS warning
lamp. (Refer to GROUP 00 - How to Use Trouble-
shooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES
With the MUT-II
Refer to GROUP 00 – How to Use
Troubleshooting/Inspection Service Points

When diagnostic trouble codes (Nos. 21 to 24) (for vehicle wheel speed sensor system failures) occur,
normal MUT-II operation may not erase those codes. In that case, erase the diagnostic trouble codes
using the following procedures.
1.
Perform erasing of the diagnostic trouble codes by special operation of the brake pedal. (See erasing
procedure for the diagnostic trouble codes without use of the MUT-II.)
2.
Turn the ignition switch OFF.
3.
Perform erasing of the diagnostic trouble codes by use of the MUT-II.
ABS <4WD> - Troubleshooting35B-4
><

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

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

21
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSTIC TROUBLE
Code No. 14 Analog G-sensor system in the SRS-ECU Probable cause
The SRS-ECU monitors the output of the analog G-sensor inside the SRS-ECU. 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
·
When the output from the analog G-sensor is abnormal·
Malfunction of SRS-ECU
Replace the SRS-ECU
Code No.15 or 16 Safing G-sensor system in the SRS-ECU Probable cause
This code is output if there is a short or open circuit between the terminals of the
safing G-sensor inside the SRS-ECU.
The trouble causes for each diagnosis code No. Are as follows·
Malfunction of SRS-ECU
Code No. Trouble Symptom
15 Short circuit in the safing G-sensor
16 Open circuit in the safing G-sensor
Replace the SRS-ECU
Code No. 21, 22 or 61 Air bag module (driver’s side squib)
systemProbable cause
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
SRS - Troubleshooting52B-6

23
Code No. 21 or 22 Air bag module (squib) system Probable cause
(1) These diagnosis codes are output if there is abnormal resistance between the
input terminals of the air bag module (squib).
The trouble causes for each code No. are as follows (Refer to chart 1.)
(2) Diagnosis codes 21 and 22 are sometimes generated in combination with
malfunction codes relating to the front impact sensor (code Nos. 11, 12 and 13),
but sometimes only one may be output instead of both being memorised.
Because of this, the front impact sensor should also be inspected at the same
time. The relationship between the codes are as follows. (Refer to chart 2.)·
Malfunction of 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 harnesses or connectors
·
Malfunction of air bag module (squib)
·
Malfunction of SDU
Chart 1
Code No. Trouble symptom
21
· Short in air bag module (squib) or harness short
· Short in clock spring
· Short in air bag module (squib) or front impact sensor harnesses leading to the power supply
22
· Open circuit in 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
· Short in air bag module (squib) or front impact sensor harnesses leading to the power supply
Chart 2
Item Front impact sensor
ShortOpen circuit
(1 sensor)Open circuit
(2 sensors)
Air bag module (squib) Short 11 or 21 12 or 21 13 or 21
Open circuit 11 or 22 12 or 22 13 or 22
Caution
Do not attempt to measure the air bag module (squib) circuit resistance. Use of a tester in
measuring the circuit resistance will supply current to the squib, or erroneous deployment due to
static electricity could cause serious injury.
SRS - Troubleshooting52B-8

4
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING
Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.
DIAGNOSIS FUNCTION
DIAGNOSIS CODE CHECK
Connect the MUT-II
to the diagnosis connector (16 –pin) under the instrument under cover, then check diagnosis codes.
(Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points.)
ERASING DIAGNOSIS CODES
Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points.
INSPECTION CHART FOR DIAGNOSIS CODES
Inspect according to the inspection chart that is appropriate for the malfunction code.
Code No. Diagnosis ItemReference Page
14 Analog G-sensor system in the SRS-ECU 52B-6
15, 16 Front impact safing G sensor system inside SRS-ECU 52B-6
17 Side impact safing G sensor system inside SRS-ECU 52B-6
21, 22, 61, 62 Driver’s side air bag module (squib) system 52B-7
24, 25, 64, 65 Front passenger’s side air bag module (squib) system 52B-8
31, 32 SRS-ECU capacitor system 52B-8
34* Connector lock system 52B-9
35 SRS-ECU (deployed air bag) system 52B-9
41* IG1 (A) power circuit system 52B-9
42* IG1 (B) power circuit system 52B-9
Lamp does not illuminate.* 52B-1043 SRS warning lamp driver circuit system
Lamp does not switch off. 52B-10
44* SRS warning lamp drive circuit system 52B-10
45 Internal circuit system of non-volatile memory (EEPROM) inside SRS-ECU 52B-11
51, 52 Driver’s side air bag module (squib ignition drive circuit) system 52B-11
54, 55 Front passenger’s side air bag module (squib ignition drive circuit) system 52B-11
71, 72, 75, 76 Side air bag module (R.H.) (squib) system 52B-11
73, 74 Side air bag module (R.H.) (squib) ignition drive circuit system 52B-12
79, 93 Side air bag module (L.H.) communication system 52B-12
81, 82, 85, 86 Side air bag module (L.H.) (squib) system 52B-12
83, 84 Side air bag module (L.H.) (squib) ignition drive circuit system 52B-13
SRS - Troubleshooting52B-5
WHEN USING THE MUT-II
Connect the MUT-II to the diagnosis connector and erase the diagnosis code.
Caution
Turn off the ignition switch before connecting or disconnecting the MUT-II.