GENERAL INFORMATION
By using the cruise control system, the driver can drive at preferred speeds in a range of approximately 40 to 200 km/h (25 to 125 mph) without depressing the accelerator pedal.
For this cruise control system, in conjunction with the electronic throttle valve control system, the engine control module (ECM) electronically controls the throttle valve.
Scheme 47
INTRODUCTION TO CRUISE CONTROL SYSTEM DIAGNOSIS
The cruise control system allows driving without stepping on the accelerator pedal by setting a random speed between approximately 40 km/h (25 mph) and 200 km/h (125 mph). Malfunctions in this system can be investigated by the following methods.
CIRCUIT OPERATION
This circuit judges the signals of each switch ("ON/OFF", "CANCEL", "COAST/SET" and "ACC/RES") of the cruise control switch. The ECM detects the state of the cruise control switch by sensing the voltages shown below.
- When all switches are released: 4.7 - 5.0 volts
- When the "ON/OFF" switch is pressed: 0 - 0.5 volt
- When the "CANCEL" switch is pressed: 1.0 - 1.8 volts
- When the "COAST/SET" switch is pressed: 2.3 - 3.0 volts
- When the "ACC/RES" switch is pressed: 3.5 - 4.2 volts
- For the stoplight switch, two switches, a stoplight switch for the stoplight illumination and a brake switch exclusively for the cruise control system, are incorporated to improve the reliability.
- As for the stoplight switch, when the brake pedal is depressed/released, the stoplight switch ON/OFF signal is transmitted from the ETACS-ECU to the ECM via CAN bus line.
- As for the brake switch, the ECM connector B-10 terminal number 108 monitor the state of the brake switch. The brake switch turn ON/OFF when the brake pedal is depressed/released, and the input signal to the ECM connector B-10 terminal number 108 changes. According to this change, the ECM judges the state of the brake switch.
- Terminal number 85 of the ECM connector B-10 monitors the clutch switch state.
- The clutch switch turns ON/OFF when the clutch pedal is depressed/released, and the input signal to the ECM changes. According to this change, the ECM judges the clutch switch status.
When the shift lever is in the "N" position, the "N" position signal is transmitted from the shift lever ECU to the ECM via CAN bus line.
- The ECM detects "ON/OFF" switch ON signal to illuminate the "CRUISE" indicator light.
- The "CRUISE" indicator light illuminate signal is transmitted from the ECM to the combination meter via CAN bus line.
ECM TERMINAL VOLTAGE REFERENCE CHART FOR CRUISE CONTROL SYSTEM OPERATION
Required Special Tool
- MB992110: Power plant ECU check harness
Use special tool MB992110, check the ECM terminal voltage.
Scheme 48
- Remove the ECM (Refer to «ENGINE CONTROL MODULE (ECM)»(/mitsubishi/lancer/x-2011-2015/remont/mechanical/#multiport-fuel-injection-mfi-20l-lancer-evolution) ).
- Connect special tool MB992110 between the ECM and the body-side harness connector.
- Measure the voltages between the check connector terminals of special tool MB992044 and ground terminals (ECM connector B-10 terminal number 81 or 93).
Special tool - Power plant ECU check harness (MB992110) connector: Component side
Scheme 49
| Terminal number | Check item | Check condition | Normal condition | |
|---|---|---|---|---|
| 85 | Clutch switch | Ignition switch: "ON" | Depress the clutch pedal. | 1V or less |
| Release the clutch pedal. | Battery positive voltage | |||
| 107 | Cruise control switch power supply | Ignition switch: "ON" | All switches: Released | 4.7 - 5.0 V |
| "ON/OFF" switch: Pressed | 0 - 0.5 V | |||
| "CANCEL" switch: Pressed | 1.0 - 1.8 V | |||
| "COAST/SET" switch: Pressed | 2.3 - 3.0 V | |||
| "ACC/RES" switch: Pressed | 3.5 - 4.2 V | |||
| 108 | Stoplight switch (brake switch) | Ignition switch: "ON" | Depress the brake pedal. | Battery positive voltage |
| Release the brake pedal. | 1V or less | |||
CONNECTOR TERMINAL REFERENCE