Mitsubishi Eclipse. Manual — part 690
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-41
.
CIRCUIT OPERATION
The throttle position sensor signal and idle position
signal are sent to the auto-cruise control-ECU
through this circuit.
The throttle position sensor sends a voltage signal to
terminal 1 of the auto-cruise control-ECU. The volt-
age depends on throttle opening angle.
The auto-cruise control-ECU receives an idle posi-
tion signal from the ECM <M/T> or PCM <A/T> at
terminal 2. The signal is OFF when the accelerator
pedal is depressed, and ON when the accelerator
pedal is released.
.
DTC SET CONDITIONS
• The Idle position signal is ON and the throttle
position sensor voltage is 2.5 volts or more for
four seconds or more.
• The Idle position signal is OFF and the throttle
position sensor voltage is 0.2 volt or less for four
seconds or more.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the throttle position sensor.
• Damaged harness or connector.
• Malfunction of the auto-cruise control-ECU.
• Malfunction of the ECM <M/T> or PCM <A/T>.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III sub assembly)
• MB991824: Vehicle Communication Interface
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991223: Harness Set
AC001451
CONNECTOR: C-20
AB
AC101201AB
CONNECTOR: C-28
AC203582AJ
CONNECTORS: C-60<2.4L ENGINE-M/T>,
C-57<2.4L ENGINE-A/T>, C-62
<3.0L ENGINE-M/T>, C-59<3.0L ENGINE-A/T>
ECM <M/T>
OR
PCM <A/T>
C-60 (G),
C-58 (GR)
C-57 (GR),
C-59 (GR)
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
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STEP 1. Check the throttle position sensor.
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) Using scan tool MB991958.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Read the MFI-DTC.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the MFI-DTC P0120 is output?
YES : For 2.4L engine, refer to GROUP 13A, Diagnosis
−
. For 3.0L
engine, refer to GROUP 13B, Diagnosis
− Diagnostic
Trouble Code Chart
NO : Go to Step 2.
STEP 2. Measure the signal voltage at auto-cruise
control-ECU connector C-20 by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-20.
(2) Turn the ignition switch to the "ON" position and the
auto-cruise control MAIN switch to the "ON" position.
(3) Measure the voltage between auto-cruise control-ECU
connector C-20 terminal 1 and ground by backprobing.
• The voltage should measure between 4.0 and 5.5 volts.
(When accelerator pedal is fully depressed.)
• The voltage should measure between 0.4 and 1.0 volts.
(When accelerator pedal is released.)
(4) Turn the auto-cruise control MAIN switch to the "OFF"
position and the ignition switch to the "LOCK" (OFF)
position.
Q: Are all of the measured voltages satisfied?
YES : Go to Step 5.
NO : Go to Step 3.
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
AC001451
CONNECTOR: C-20
AB
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
AC103150
C-20 CONNECTOR
HARNESS SIDE VIEW
AB
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-43
STEP 3. Check auto-cruise control-ECU connector C-20
and intermediate connector C-28 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 4.
NO : Repair or replace the faulty connector. (Refer to
GROUP 00E, Harness Connector Inspection
AC001451
CONNECTOR: C-20
AB
AC101201AB
CONNECTOR: C-28
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-44
STEP 4. Check the harness wire between throttle position
sensor connector B-07 terminal 3 and auto-cruise
control-ECU connector C-20 terminal 1 for damage.
Q: Is the harness wire in good condition?
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
). Go to
Step 9.
NO : Repair the damaged harness wire. Go to Step 9.
AC103106AB
CONNECTOR: B-07 <2.4L ENGINE>
AC103107
CONNECTOR: B-07 <3.0L ENGINE>
AC
AC001451
CONNECTOR: C-20
AB
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