AUTO-CRUISE CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-7
AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS
INTRODUCTION TO AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS
M1172003300068
The auto-cruise control system allows driving without
stepping on the accelerator pedal by setting a
random speed between 40 km/h (25 mph) and 200
km/h (124 mph).
Problems in this system can be investigated by the
following methods.
Auto-cruise control system diagnostic
trouble codes
The auto-cruise control system consists of the auto-
cruise control-ECU, control switches, sensors, and
vacuum pump.
The control switches and sensors monitor the state
of the vehicle.
Based on input signals from those switches and
sensors, the auto-cruise control-ECU activates the
vacuum pump.
If the auto-cruise control-ECU detects a problem on
any of those components, the ECU estimates where
the problem may be occurring, and will output a
diagnostic trouble code.
Diagnostic trouble codes cover the throttle position
sensor, auto-cruise control switch, vehicle speed
sensor, auto-cruise control-ECU and vacuum pump.
AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY
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Use these steps to plan your diagnostic strategy.
If you follow them carefully, you will check most of
the possible causes of an auto-cruise control system
problem.
1. Gather information from the customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any auto-cruise control
system DTC.
4. If you can verify the condition and there are no
auto-cruise control system DTCs, and the
malfunction is intermittent, refer to GROUP 00,
HOW TO USE TROUBLESHOOTING/
INSPECTION SERVICE POINTS - How to Cope
with Intermittent Malfunctions
P.00-6
.
5. If you can verify the condition but there are no
auto-cruise control system DTCs, or the system
cannot communicate with the scan tool, check
that the auto-cruise control system is operating
properly.
•
If the auto-cruise control system is operating
properly, refer to, Auto-cruise Control System
Data List Reference Table.
•
If the auto-cruise control system is operating
properly, refer to, Auto-cruise Control System
Diagnostic Trouble Code Chart.
6. If there is an auto-cruise control system DTC,
record the number of the code, then erase the
code from vehicle memory using the scan tool.
7. Re-create the auto-cruise control system DTC set
conditions to see if the same Auto-cruise Control
System DTC will set again.
•
If the same Auto-cruise Control System DTC sets
again, perform the diagnostic procedures for the
set code. Refer to, Auto-cruise Control System
Diagnostic Trouble Code Chart.
AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC
TROUBLE CODE DIAGNOSIS
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Retrieving Auto-cruise Control System Diagnostic Trouble
Codes.
Using scan tool MB991502
Required Special Tool:
•
MB991502: Scan Tool (MUT-II)