Mitsubishi Montero (2002-2004). Manual — part 254
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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INSPECTION PROCEDURE B-1: Tone Alarm: Ignition key reminder tone alarm function does not work
normally.
NOTE: This troubleshooting procedure requires the
use of scan tool MB991502 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
.
CIRCUIT OPERATION
The ETACS-ECU operates the ignition key reminder
tone alarm function (sounds the tone alarm intermit-
tently), based on input signals from the following
switches:
• Ignition switch (IG1): OFF
• Key reminder switch: OFF
• Driver’s door switch: ON
The ETACS-ECU operates the ignition key reminder
tone alarm function (sounds the tone alarm intermit-
tently) if any of the following conditions are satisfied:
• Ignition switch: LOCK position (key inserted)
• Driver’s door: OPEN
.
TECHNICAL DESCRIPTION (COMMENT)
If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").
.
TROUBLESHOOTING HINTS
• The key reminder switch may be defective
• The front door switches may be defective
• The ETACS-ECU may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
Ignition Key Reminder Tone Alarm Function
SYMPTOM PROCEDURES
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DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991502: Scan Tool (MUT-II)
• MB991862: SWS monitor kit
STEP 1. Use scan tool MB991502 to select "ECU COMM
CHK" on the SWS monitor display.
Check the ETACS-ECU.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector
(16-pin).
(2) Connect SWS monitor kit MB991862 to the data link
connector (13-pin).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Operate scan tool MB991502 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
(5) Scan tool MB991502 should show "OK" on the "ECU
COMM CHK" menu for the "ETACS ECU" menu.
Q: Is "OK" displayed on the "ETACS ECU" menu?
YES : Go to Step 2.
NO : Refer to Inspection Procedure A-3 "Communication
with ETACS-ECU is not possible
AC204222AB
16-pin
13-pin
MB991502
MB991862
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
• Ignition switch: OFF (key inserted)
• Driver’s door: open
• Front passenger's door: closed
Operate scan tool MB991502 according to the procedure below
to display "KEY RMND. ALM."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "BUZZER."
6. Select "KEY RMND. ALM."
Check that normal conditions are displayed on the items
described in the table below.
NOTE: The scan tool display changes when the driver's or the
front passenger's door is opened. If any of the doors is open,
the system can not be checked correctly.
Q: Are normal conditions displayed on the "IG SW (IG1)",
"FRONT DOOR SW" and "BUZZER"?
YES : Replace the ETACS-ECU. The ignition key reminder
tone alarm function should now work normally.
NO :
• Normal condition is not displayed on the "IG SW
(IG1)": Refer to Inspection Procedure O-2
"ETACS-ECU does not receive any signal from
the ignition switch (IG1)
• Normal condition is not displayed on the "FRONT
DOOR SW": Refer to Inspection Procedure O-5
"ETACS-ECU does not receive any signal from
the driver's or the front passenger's door switch
• Normal condition is not displayed on the
"BUZZER": Go to Step 3.
ITEM NO.
ITEM NAME
NORMAL
CONDITION
ITEM 30
IG SW (IG1)
OFF
ITEM 32
FRONT DOOR SW
ON
ITEM 43
BUZZER
ON
AC204222AB
16-pin
13-pin
MB991502
MB991862
SYMPTOM PROCEDURES
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SWS SYMPTOM PROCEDURES
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STEP 3. Check the input signal (by using the pulse check
mode of the monitor.)
Check the input signals from the key reminder switch.
Operate scan tool MB991502 according to the procedure below
to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
• Check whether scan tool MB991502 sounds or not when
the ignition key is removed and reinserted.
Q: Does scan tool MB991502 sound when the ignition key
is removed and reinserted?
Yes : Replace the ETACS-ECU. The ignition key reminder
tone alarm function should now work normally.
No : Refer to Inspection Procedure P-1 "ETACS-ECU does
not receive any signal from the key reminder switch
."
INSPECTION PROCEDURE B-2: Tone Alarm: Light reminder tone alarm function does not work
normally.
NOTE: This troubleshooting procedure requires the
use of scan tool MB991502 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
.
CIRCUIT OPERATION
The ETACS-ECU operates the light reminder tone
alarm function intermittently according to the follow-
ing signals:
• Ignition switch (IG1): OFF
• Front door switch (LH): ON
• Taillight switch: ON
• Headlight switch: ON
The ETACS-ECU operates the light reminder tone
alarm function intermittently under the following con-
ditions.
• Ignition switch: LOCK position (key removed)
• Driver’s door: OPEN
• Lighting Switch: Tail or Head position
AC204222AB
16-pin
13-pin
MB991502
MB991862
Light Reminder Tone Alarm Function
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