3.
Has a problem been found?
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Go to "Power Circuit Inspection" procedure.
The cruise control system keeps the vehicle running at a fixed speed until a signal canceling this fixed speed cancelling signalis 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 judged 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 : Output signal ＜ 250 mV ● Case 2 :Output signal ＞ 4.9 V ● Case 3 :If the vehicle speed governer is off when the resume inputs or if the vehicle speed governer is off when the cruise control SET+/SET- switch inputs. | |
Diagnostic Time | ● Case 1 : 60 sec ● Case 2 : 0.5 sec ● Case 3 : 1 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 "Power Circuit Inspection" procedure.
Check for open or short in harness
Ignition "OFF".
Disconnect multi-function switch connector.
Ignition "ON" & Engine "OFF".
Measure voltage between terminal 3 of the multi-function switch harness connector and chassis ground.
Specification : Approx. B+
Is the measured voltage within specifications ?
▶ Go to "Signal Circuit Inspection" procedure.
▶ Check for open or short to ground in power harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open or short in signal harness
Ignition "OFF" & Engine "OFF".
Disconnect Multi-function switch connector.
Measure voltage between terminal 1 of the multi-function switch harness connector and chassis ground.
Specification : Infinite
Is the measured voltage within specifications ?
▶ Go to "Ground Circuit Inspection" procedure.
▶ Check for open or short to ground in signal harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF".
Disconnect Multi-function switch and ECM connector.
Measure resistance between terminal 4 of the multi-function switch connector and terminal 74 of ECM harness connector.
Specification : Approx. below 1Ω
Is the measured resistance within specifications ?
▶ Go to "Component Inspection" procedure.
▶ Check for open in harness.
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check Cruise remote control switch
Ignition "OFF".
Disconnect ECM connector.
Measure resistance between terminal 74 and 75 of ECM harness connector after Main switch ON.
Main switch "OFF" and then measure resistance between terminal 40 and 74 of ECM harness connector after SET/COAST switch ON.
SET/COAST switch "OFF" and then, measure resistance between terminal 40 and 74 of ECM harness connector after RESUME/ACCEL switch ON.
Main Switch | SET/COAST Switch | RESUME/ACCEL Switch |
390Ω | 220Ω | 910Ω |
Is the measured resistance within specifications ?
▶ 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 Cruise Remote control switch and check for proper operation.
If the problem is corrected, replace Cruise Remote control switch 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.
