DESCRIPTION
The cruise control system uses the same vehicle speed signal that is sent to the ECM for the SFI system. If DTC P0500 is detected, perform the diagnosis using the inspection procedure for DTC P0500 in the SFI system (for 2GR-FE). Refer to DESCRIPTION . The speed signal is converted for use by the cruise control inside the ECM. Both the SFI system and the cruise control system can set DTC P0500, however, the detection conditions of the two systems are different.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0500 | The vehicle speed signal from the vehicle speed sensor is cut for 0.14 sec. or more while cruise control is in operation | Vehicle speed sensor Vehicle speed sensor signal circuit Combination meter assembly ECM |
The cruise control system uses the same vehicle speed signal that is sent to the ECM for the SFI system. If DTC P0500 is detected, perform the diagnosis using the inspection procedure for DTC P0500 in the SFI system (for 2GR-FE). Refer to DESCRIPTION . The speed signal is converted for use by the cruise control inside the ECM. Both the SFI system and the cruise control system can set DTC P0500, however, the detection conditions of the two systems are different.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0500 | The vehicle speed signal from the vehicle speed sensor is cut for 0.14 sec. or more while cruise control is in operation | Vehicle speed sensor Vehicle speed sensor signal circuit Combination meter assembly ECM |
If a malfunction (a rapid change in vehicle speed) in the vehicle speed signal being output from the skid control ECU is detected while the cruise control is in operation, the ECM determines that there is a momentary interruption or noise, and outputs a DTC.
| DTC | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0503 | A momentary interruption and noise are detected when a rapid change of the vehicle speed occurs while cruise control is in operation. | Vehicle speed sensors Vehicle speed sensor signal circuit Combination meter assembly ECM |
Scheme 37
If a malfunction (a rapid change in vehicle speed) in the vehicle speed signal being output from the skid control ECU is detected while the cruise control is in operation, the ECM determines that there is a momentary interruption or noise, and outputs a DTC.
| DTC | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0503 | A momentary interruption and noise are detected when a rapid change of the vehicle speed occurs while cruise control is in operation. | Vehicle speed sensors Vehicle speed sensor signal circuit Combination meter assembly ECM |
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP SW fuse and the stop light switch, and the ECM turns the cruise control off.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0571 | Voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 sec. or more | Stop light switch Stop light switch circuit ECM |
Scheme 38
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP SW fuse and the stop light switch, and the ECM turns the cruise control off.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0571 | Voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 sec. or more | Stop light switch Stop light switch circuit ECM |
This DTC indicates the internal abnormalities of the ECM.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0575 | When both of the following conditions are met: STP signals input to the ECM supervisory CPU and control ECU are different for 0.15 sec. or more 0.4 sec. have passed after cruise cancel input signal (STP input) is input to the ECM | ECM |
HINT
The ECM receives signals from each sensor to control all functions of the cruise control system. When a trouble code is detected, the fail-safe function remains on until the engine switch is turned off.
The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads the voltage value that has been changed by the switch operation to control SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL.
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- READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. TEXT IN ILLUSTRATION *1 ON/OFF *2 - SET *3 + RES *4 CANCEL Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Cruise Control / Data List. Check the Data List for proper functioning of the cruise control main switch. CRUISE CONTROL (ECM) Techstream Display Measurement Item/Range Normal Condition Diagnostic Note Main SW M-CPU Main switch signal (Main CPU)/ON or OFF ON: Main switch on OFF: Main switch off - Cancel Switch CANCEL switch signal/ON or OFF ON: CANCEL switch on OFF: CANCEL switch off - SET/COAST Switch SET/COAST switch signal/ON or OFF ON: - SET switch on OFF: - SET switch off - RES/ACC Switch RES/ACC switch signal/ON or OFF ON: + RES switch on OFF: + RES switch off - OK When the cruise control main switch is operated, the display changes as shown above. RESULT Result Proceed to OK A NG (All items are defective) B NG (1 to 3 items are defective) C C --> See step 7 B --> See step 2 A --> See step 6
- INSPECT CRUISE CONTROL MAIN SWITCH Remove the cruise control main switch. Refer to «REMOVAL»(ref-400829-S40867737822011051800000) . TEXT IN ILLUSTRATION *1 Component without harness connected: (Cruise Control Main Switch) *2 Main Switch *3 Lever *4 ON/OFF *5 - SET *6 + RES *7 CANCEL - - Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition A-1 (ECC) - A-3 (CCS) Main switch off*1 1 Mohms or higher Main switch on Below 2.5 ohms + RES 235 to 245 ohms - SET 617 to 643 ohms CANCEL 1509 to 1571 ohms *1: The lever is in the neutral position. NG --> See step 7 OK: Go to next step
- CHECK HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - SPIRAL CABLE SUB-ASSEMBLY) Disconnect the connector from the spiral cable sub-assembly. TEXT IN ILLUSTRATION *1 Front view of wire harness connector: (to Spiral Cable Sub-assembly) *2 Front view of wire harness connector: (to Cruise Control Main Switch) Disconnect the connector from the cruise control main switch. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A-3 (CCS) - m1-3 (CCS) Always Below 1 ohms A-1 (ECC) - m1-4 (ECC) Always Below 1 ohms Reconnect the connector from the cruise control main switch. Reconnect the connector from the spiral cable sub-assembly. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- CHECK SPIRAL CABLE SUB-ASSEMBLY NOTE: The spiral cable sub-assembly is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable sub-assembly may cause airbag deployment. Be sure to read the information shown in the brackets. HINT: Removal. Refer to «REMOVAL»(ref-400651-S34517911102011051800000) Installation. Refer to «INSTALLATION»(ref-400651-S38674347252011051800000) Remove the spiral cable sub-assembly. Refer to «REMOVAL»(ref-400829-S40867737822011051800000) . TEXT IN ILLUSTRATION *1 Component without harness connected: (Spiral Cable Sub-assembly) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition m1-3 (CCS) - F40-1 (CCS) The spiral cable sub-assembly position is center Below 1 ohms The spiral cable sub-assembly position is 2.5 rotations to the left The spiral cable sub-assembly position is 2.5 rotations to the right m1-4 (ECC) - F40-2 (ECC) The spiral cable sub-assembly position is center Below 1 ohms The spiral cable sub-assembly position is 2.5 rotations to the left The spiral cable sub-assembly position is 2.5 rotations to the right HINT: The spiral cable sub-assembly makes a maximum of approximately 5 rotations. Remove the spiral cable sub-assembly. Refer to «INSTALLATION»(ref-400829-S15980386682011051800000) . NG --> See step 8 OK: Go to next step
- CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - ECM AND BODY GROUND) Disconnect the ECM connector. Disconnect the spiral cable sub-assembly connector. Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 Front view of wire harness connector: (to Spiral Cable Sub-assembly) *2 Front view of wire harness connector: (to ECM) Standard Resistance Tester Connection Condition Specified Condition F40-1 (CCS) - A43-45 (CCS) Always Below 1 ohms A43-45 (CCS) - Body ground Always 10 kohms or higher F40-2 (ECC) - Body ground Always Below 1 ohms Reconnect the spiral cable sub-assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400833-S40092134112011051800000)
- REPLACE CRUISE CONTROL MAIN SWITCH. Refer to «COMPONENTS»(ref-400829-S33359210212011051800000)
- REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to «COMPONENTS»(ref-400651-S42497469442011051800000)
- REPLACE ECM. Refer to «COMPONENTS»(ref-400788-S29297998782011051800000)
The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads the voltage value that has been changed by the switch operation to control SET, - (COAST), RES (RESUME), + (ACCEL), and CANCEL.
- The ECM detects a cruise control switch signal and sends it to the combination meter through CAN. Then the cruise main indicator light comes on.
- The cruise main indicator light circuit uses CAN for communication. If there is a malfunction in this circuit, check for DTCs in the CAN communication system before troubleshooting this circuit.
- The ECM detects a cruise control switch signal and sends it to the combination meter through CAN. Then the cruise main indicator light comes on.
- The cruise main indicator light circuit uses CAN for communication. If there is a malfunction in this circuit, check for DTCs in the CAN communication system before troubleshooting this circuit.
Connecting terminals TC and CG of the DLC3 causes the system to enter self-diagnostic mode. If a malfunction is present, the MIL will blink.
HINT
When a particular warning light remains blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in the relevant ECU is suspected.
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- CHECK HARNESS AND CONNECTOR (TERMINAL TC of DLC3 - ECM) Disconnect the ECM connector. TEXT IN ILLUSTRATION *1 DLC3 *2 Front view of wire harness connector: (to ECM) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A43-16 (TC) - F17-13 (TC) Always Below 1 ohms Connect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - ECM) OK: Go to next step
- CHECK HARNESS AND CONNECTOR (TERMINAL CG of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 DLC3 Standard Resistance Tester Connection Condition Specified Condition F17-4 (CG) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - BODY GROUND) OK: Go to next step
- CHECK HARNESS AND CONNECTOR (TERMINAL TC of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. TEXT IN ILLUSTRATION *1 DLC3 Standard Resistance Tester Connection Condition Specified Condition F17-13 (TC) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU OK --> See step 4
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400833-S40092134112011051800000)
Connecting terminals TC and CG of the DLC3 causes the system to enter self-diagnostic mode. If a malfunction is present, the MIL will blink.
HINT
When a particular warning light remains blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in the relevant ECU is suspected.