3.
Has a problem been found?
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Go to "Control Circuit Inspection" procedure.
The cruise control system keeps the vehicle running at a fixed speed until a signal canceling this fixed speed is received.
When the main switch "AUTO CRUISE" is turned on with vehicle in the running mode, the battery voltage is applied to the ECM. When a signal from the control switch is input to the ECM while the vehicle is in state, the cruise control actuator is activited to operate the system.
Also, while the system is operating, "AUTO CRUISE" indicator lamp in the meter assembly lights up.
In case of the cruise control system failure, the engine symptoms will occur acceleration failure and vehicle speed setting failure.
If the signal exceeds threshold value, the ECM judges this as a fault and DTC is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Votage check, low or high | ● Open or short in cruise control circuit ● Faulty cruise control switch ● Faulty ECM |
Enable Conditions | ● Engine run | |
Threshold Value | ● Case 1 : Short for cruise control lamp circuit. ● Case 2 : Open for cruise control lamp circuit. | |
Diagnostic Time | ● Case 1 : 0.5 sec ● Case 2 : 1.2 sec | |
MIL Fuel Limit Fuel Cut EGR Off | ● No ● No ● No ● No |
Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Go to "Control Circuit Inspection" procedure.
Ignition "OFF" & Engine "OFF".
Disconnect ECM connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 14 of ECM harness connector and chassis ground.
Specification : Approx. 10.8 ~ 13.0V
Is the measured voltage within specifications ?
▶ Go to "Component Inspection" procedure.
▶ Check for open or short in control harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check Cruise control indication lamp
Ignition "ON" & Engine "OFF".
Disconnect ECM connector.
Jump terminal 24 of ECM harness connector and chassis ground with jumper wire.
Is the Cruise control indication lamp turned ON ?
▶ Go to "Check bulb" as below.
▶ Check for open or short in signal harness.
Repair as necessary and go to "Verification vehicle Repair" procedure.
Check Bulb
Ignition "OFF" & Engine "OFF".
Remove Instrument Panel and then remove bulb from instrument panel.
Apply 12 voltage to the bulb and check that bulb is turned ON.
Is the bulb turned ON ?
▶ Substitute with a known-good ECM and check for proper operation.
If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.
▶ Substitute with a known-good bulb and check for proper operation.
If the problem is corrected, replace bulb and then go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
Operate the vehicle within DTC Enable conditions in General information.
Are any DTCs present ?
Go to the applicable troubleshooting procedure.
System is performing to specification at this time.
