Mitsubishi Eclipse. Manual — part 821
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-293
.
CIRCUIT OPERATION
If a fail-safe is triggered while driving forward, the
PCM flashes the "N" range light once per second
(triggered fail-safe). The PCM does this by switching
battery positive voltage to terminal 121.
.
DTC SET CONDITIONS
If the PCM detects a fail-safe condition, it will attempt
to illuminate the "N" range light. The PCM sends a 12
volts pulse for 60
− 180 ms. If it does not detect a
voltage drop during the pulse, it waits about 60 sec-
onds and pulses 12 volts again for 60
− 180 ms. If
the PCM does no detect the voltage drop before the
ignition switch is turned "LOCK" (OFF), the PCM will
consider it as an short circuit of the "N" range light
circuit and DTC 56 is set.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Defective "N" range light bulb
• 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
• MB991911: MUT-III Main Harness B
AC001729AW
CONNECTOR: C-43
C-43
AC001657
CONNECTOR: C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>
PCM
BC
C-61 <2.4L ENGINE> OR C-63 <3.0L ENGINE>
AC001729AZ
CONNECTOR: C-78
C-78
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-294
STEP 1. Check the "N" range light bulb.
(1) Turn the ignition switch to the "ON" position.
(2) Move the selector lever to "N" position.
• The "N" range light in the combination meter illuminates.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the "N" range light illuminate?
YES : Go to Step 7.
NO : Go to Step 2.
STEP 2. Check the "N" range light bulb.
(1) Remove the combination meter. Refer to GROUP 54A,
Chassis Electrical
− Combination Meter Assembly and
Vehicle Speed Sensor
(2) Check the "N" range light bulb.
Q: Is the bulb in good condition?
YES : Go to Step 3.
NO : Replace the "N" range light bulb.
STEP 3. Check combination meter connector C-43 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 4.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC001729AW
CONNECTOR: C-43
C-43
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-295
STEP 4. Measure the resistance at combination meter
connector C-43.
(1) Disconnect connector C-43 and measure at the harness
side.
(2) Measure the resistance between terminal 12 and ground.
• The measured resistance should be less than 2 ohms.
Q: Is the measured resistance less than 2 ohms?
YES : Go to Step 7.
NO : Go to Step 5.
STEP 5. Check joint connector (2) connector C-78 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 damage
between combination meter connector C-43 terminal 12
and body ground.
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair or replace the harness wire.
AC001729AW
CONNECTOR: C-43
C-43
AC102538
11
1
2
3
12
4
5
6
7
8
9
10
13
14
15
16
C-43 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
AC001729AZ
CONNECTOR: C-78
C-78
AC001729AW
CONNECTOR: C-43
C-43
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-296
STEP 7. Check transmission range switch connector B-41,
combination meter connector C-43, intermediate
connector C-27 and PCM connector C-61 <2.4L Engine> or
C-63 <3.0L Engine> for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC001844
CONNECTOR: B-41
DIPSTICK
AK
B-41
AC001729AW
CONNECTOR: C-43
C-43
AC001741
CONNECTOR: C-27
AR
C-27
AC001657
CONNECTOR: C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>
PCM
BC
C-61 <2.4L ENGINE> OR C-63 <3.0L ENGINE>
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