Mitsubishi Galant 9G. Manual — part 548
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-270
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Voltage of battery: 9 volts or more.
• Time after PCM turns on A/T control relay: 0.5
second or more.
Judgement Criteria
• A/T control relay output voltage: 7 volts or less.
(0.1 second)
• If DTC 54 (P1751) is set consecutively four times,
the transaxle is locked into 3rd gear as a fail-safe
measure, and the "N" range light flashes once
per second.
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, and keep the vehicle stopped in "P"
range for 5 seconds.
.
AC205241
START
END
No
Malfunction
Yes
Good
No
Yes
No
Yes
No
Yes
No
Yes
Timer start
TCM turn on A/T
control relay
Timer > 0.5 sec.
Voltage of battery > 9 V
Output voltage from
control relay < 7 V
Continuous failure
for 0.1 sec.
PCM
AB
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-271
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Malfunction of the A/T control relay
• Damaged harness or connector
• Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
STEP 1. Using scan tool MB991958, check data list item 54:
A/T Control Relay Output Voltage.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode.
• Item 54: A/T Control Relay Output Voltage.
• The voltage should equal battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage equal battery positive voltage?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-272
STEP 2. Check the A/T control relay.
(1) Remove the A/T control relay from the engine component
relay box connector B-16X.
(2) Using jumper wires, connect terminal 2 to the positive
battery terminal, and terminal 3 to the negative battery
terminal.
(3) Measure the resistance between terminals 1 and 4 of the
A/T control relay.
• The resistance should be measured less than 2 ohms.
• Disconnect the jumper wires. The resistance between
terminals 1 and 4 should measure over limits (open cir-
cuit).
Q: Is the measured resistance less than 2 ohms when the
relay is energized, and open circuit when the relay is
de-energized?
YES : Go to Step 3.
NO : Replace the A/T control relay.
STEP 3. Check A/T control relay socket B-16X in the
engine compartment relay box for loose, corroded or
damaged terminals, or terminals pushed back in the
socket.
Q: Is the relay connector in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC306354
RELAY BOX
AB
CONNECTOR: B-16X
2
1
3
4
FRONT OF
VEHICLE
AC210725
2
1
3
4
AD
B-16X HARNESS CONNECTOR:
A/T CONTROL RELAY SIDE
FRONT OF VEHICLE
AC306354
RELAY BOX
AB
CONNECTOR: B-16X
2
1
3
4
FRONT OF
VEHICLE
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-273
STEP 4. Measure the supply voltage at A/T control relay
connector B-16X in the engine component relay box.
(1) Disconnect the A/T control relay.
(2) Measure the voltage between terminal 1 and ground.
• The measured voltage should equal battery positive
voltage.
Q: Is the measured voltage equal to battery positive
voltage?
YES : Go to Step 7.
NO : Go to Step 5.
STEP 5. Check intermediate connector A-13 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 6. Check the harness for open circuit or short circuit
to ground between A/T control relay connector B-16X
terminal 1 in the engine component relay box and battery.
Q: Is the harness wire in good condition?
YES : Go to Step 15.
NO : Repair or replace the harness wire.
AC306354
RELAY BOX
AB
CONNECTOR: B-16X
2
1
3
4
FRONT OF
VEHICLE
AC210728
1
3
2
4
AC
B-16X HARNESS
CONNECTOR:
RELAY BOX SIDE
FRONT OF
VEHICLE
AC306223
A-13 (GR)
AB
CONNECTOR: A-13
1
4
7
8
2 3
5
13
14
17
15
12
16
11
10
9
6
AC306354
RELAY BOX
AB
CONNECTOR: B-16X
2
1
3
4
FRONT OF
VEHICLE
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