Cruise Control Systems - Except Evolution: Other Mitsubishi Lancer IX

Using Auto-Cruise Control Indicator Light

1. Turn the ignition switch to the ON position while holding the auto-cruise control switch in the SET position (down). Then, within one second, move the cruise control switch up to the RES position. (Scheme 19)
2. Read a diagnostic trouble code by observing the flash display pattern of the auto-cruise control indicator light in the combination meter. (Scheme 20)

Scheme 19

Scheme 20

HOW TO COPE WITH INTERMITTENT MALFUNCTIONS

Most intermittent malfunctions occur under certain conditions. If those conditions can be identified, the cause will be easier to find.

Ask The Customer About The Malfunction

Ask what it feels like, what is sounds like, etc. Then ask about driving conditions, weather, frequency of occurrence, and so on.

Determine The Conditions From The Customer's Response

Typically, almost all intermittent malfunctions occur from conditions like vibration, temperature and/or moisture change, poor conditions. From the customers responses, it should be reasoned which condition is most likely.

Verify The Intermittent Malfunction Is Eliminated

Repair the malfunctioning part and try to duplicate the condition(s) again to verify the intermittent malfunction has been eliminated.

Simulation Tests

Note. In case of difficulty in finding the cause of the intermittent malfunction, the data recorder function in the scan tool is effective.

For these simulation tests, shake, then gently bend, pull, and twist the wiring of each of these examples to duplicate the intermittent malfunction. (Scheme 21)

1. Shake the connector up-and-down, and right-and-left.
2. Shake the wiring harness up-and-down, and right-and-left. Especially, check the splice points of wiring harnesses carefully.
3. Vibrate the part or sensor.

Scheme 21

Step 1: Check The Output Circuit Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nuts. (Scheme 70)
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the ON position and the auto-cruise control main switch to the ON position.
4. Measure the voltage between terminal No. 7 and ground by backprobing. (Scheme 22) Voltage should be battery positive voltage. When decelerating with the SET switch while driving at constant speed, the release valve is open.
5. Measure the voltage between terminal No. 8 and ground by backprobing. Voltage should be battery positive voltage. When decelerating with the SET switch while driving at constant speed, the control valve is open.
6. Measure the voltage between terminal No. 16 and ground by backprobing. Voltage should be battery positive voltage. (When the motor is stopped during a constant road speed.)
7. Turn the ignition switch to the LOCK (OFF) position.

Are all of the above values satisfied?

1. YES Check that diagnostic trouble code 11 is not output. If diagnostic trouble code 11 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 11 is not output.
2. NO Go to step «2»(ref-169874-S00364878842004121700000) .

Scheme 22

Step 2: Check Auto-Cruise Control-ECU Connector C-107 And Intermediate Connector C-108, C-111 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «3»(ref-169874-S00563477322004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 11 is not output.

Step 3: Check Auto-Cruise Control Vacuum Pump Connector A-26 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «4»(ref-169874-S24046002192004121700000) .
2. NO Repair or replace connector. Then check that the diagnostic trouble code 11 is not output.

Step 4: Check The Auto-Cruise Vacuum Pump

1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump. (Scheme 23)
2. Disconnect the vacuum pump connector.
3. Check the auto-cruise vacuum pump and valves according to the following: Connect the positive battery terminal to auto-cruise vacuum pump connector terminal No. 1, and the negative battery terminal to terminals No. 2, 3, and 4. The vacuum gauge should read 27 kPa (8.0 in Hg) or more. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 2 is disconnected from the negative battery terminal while terminals No. 1 and 3 remain connected. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2 and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 3 is disconnected from the negative battery terminal while terminals No. 1, and 2 remain connected.

Are all of the above values satisfied?

1. YES Go to step «5»(ref-169874-S20615172002004121700000) .
2. NO Replace the auto-cruise vacuum pump. Then check that diagnostic trouble code 11 is not output.

Scheme 23

Step 1: Check The Speedometer

Does the speedometer work normally?

1. YES Go to step «2»(ref-169874-S35666158882004121700000) .
2. NO Check the speedometer circuit and repair or replace as required.

Step 2: Check The Intermediate Connector C-124 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector terminals in good condition?

1. YES Go to step «3»(ref-169874-S41642379962004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 12 is not output.

Does the speedometer work normally?

1. YES Go to step «2»(ref-169874-S32355107692004121700000) .
2. Check the speedometer circuit and repair or replace as required.

Step 2: Check Stoplight Switch Connector C-102 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «13»(ref-169874-S00817923552004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 14 is not output.

Step 3: Check The Output Circuit Voltage At Stoplight Switch Connector C-102 By Backprobing

1. DO NOT disconnect stoplight switch connector C-102.
2. Turn the ignition switch to the ON position and the auto-cruise control main switch on the ON position.
3. Measure the voltage between terminal No. 4 and ground by backprobing. The measured voltage should measure battery positive voltage. (When the brake pedal is depressed). The measured voltage should measure 0 volts. (When the brake pedal is depressed).
4. Turn the ignition switch to the LOCK (OFF) position.

Are all of the measured voltages satisfied?

1. YES Go to step «6»(ref-169874-S21211947272004121700000) .
2. NO Go to step «4»(ref-169874-S07115105052004121700000) .

Step 4: Check Stoplight Switch Connector C-102 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «5»(ref-169874-S23628155672004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 14 is not output.

Step 5: Check The Stoplight Switch

1. Disconnect stoplight switch connector C-102.
2. Connect an ohmmeter to the stoplight switch between terminals No. 3 and 4, and check whether there is continuity when the plunger of the stoplight switch is pushed in and an open circuit when it is released. (Scheme 24)
3. The stoplight switch is in good condition if the circuit is open when the plunger is pushed in to a depth of within 4 mm (0.2 inch) from the outer case edge surface, and if there is continuity when it is released. (Scheme 25)

Is the stoplight switch in good condition?

1. YES Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 14 is not output.
2. NO Replace the stoplight switch. Then check that a diagnostic trouble code 14 is not output.

Scheme 24

Scheme 25

Step 6: Measure The Signal Voltage At Auto-Cruise Control Vacuum Pump Connector A-26 By Backprobing

1. DO NOT disconnect auto-cruise control vacuum pump connector A-26.
2. Turn the ignition switch to the ON position and the auto-cruise control main switch to the ON position.
3. Measure the voltage between terminal No. 1 and ground by backprobing. (Scheme 26) The measured voltage should measure battery positive voltage. When the brake pedal is depressed. The measured voltage should measure 0 volts. (When the brake pedal is not depressed).
4. Turn the ignition switch to the LOCK (OFF) position.

Are all of the measured voltages satisfied?

1. YES Go to step «9»(ref-169874-S00868949922004121700000) .
2. NO Go to step «7»(ref-169874-S07432773892004121700000) .

Scheme 26

Step 7: Check Auto-Cruise Control Vacuum Pump Connector A-26, Stoplight Switch Connector C-102, And Intermediate Connector C-111 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «8»(ref-169874-S34926323922004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 14 is not output.

Step 9: Measure The Signal Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the ON position and the auto-cruise control main switch to the ON position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 7 and ground by backprobing. The measured voltage should measure greater than 10 volts. (When cancelling constant speed driving with the auto-cruise control CANCEL switch).
5. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 8 and ground by backprobing. The measured voltage should measure greater than 10 V. (When decelerating with the auto-cruise control SET switch while driving at constant speed).
6. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 16 and ground by backprobing. The measured voltage should measure battery positive voltage. (When the motor is stopped during a constant road speed).
7. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto- cruise control-ECU. Then check that diagnostic trouble code 14 is not output.
2. NO Go to step «10»(ref-169874-S38227892842004121700000) .

Step 10: Check Auto-Cruise Control-ECU Connector C-107 And Intermediate Connector C-108, C-111 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «11»(ref-169874-S05599169802004121700000) .
2. NO Repair or replace the connector. Then check that diagnostic trouble code 14 is not output.

Step 11: Check The Auto-Cruise Vacuum Pump Connector A-26 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «12»(ref-169874-S32798194472004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 14 is not output.

Scheme 27

Step 12: Check The Auto-Cruise Vacuum Pump

1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
2. Disconnect the vacuum pump connector.
3. Check the auto-cruise vacuum pump and valves according to the following procedure: Connect the positive battery terminal to auto-cruise vacuum pump connector terminal No. 1, and the negative battery terminal to terminal No. 2, 3, and 4. The vacuum gauge should read 27 kPa (8.0 in Hg) or more. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 2 is disconnected from the negative battery terminal while terminals No. 1, and 3 remain connected. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 3 is disconnected from the negative battery terminal while terminals No. 1, and 2 remain connected.

Are all of the above values satisfied?

1. YES Go to step «13»(ref-169874-S00817923552004121700000) .
2. No Replace the auto-cruise vacuum pump. Then check that diagnostic trouble code 14 is not output.

Step 14: Measure The Signal Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position and the auto-cruise control main switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 5 and ground by backprobing. (Scheme 28) The measured voltage should measure battery positive voltage. (When brake pedal is depressed). The measured voltage should measure 0 V. (When brake pedal is not depressed).
5. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Go to step «15»(ref-169874-S07390707132004121700000) .
2. NO Go to step «17»(ref-169874-S04913815442004121700000) .

Scheme 28

Step 15: Check Intermediate Connector C-108 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «16»(ref-169874-S24758711152004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 14 is not output.

Step 17: Check Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Check that diagnostic trouble code 14 is not output. If diagnostic trouble code 14 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 14 is not output.
2. NO Repair or replace connector. Then check that diagnostic trouble code 14 is not output.

Scheme 29

Scheme 30

Step 1: Check The 12 Volt Supply Circuit Voltage At Auto-Cruise Control Switch Connector C-202

1. Disconnect auto-cruise control switch connector C-202.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between connector C-202 terminal No. 1 and ground. (Scheme 31) The measured voltage should measure battery positive voltage.
4. Turn the ignition switch to the LOCK (OFF) position, connect auto-cruise control switch connector C-202.

Is the voltage approximately battery positive voltage?

1. YES Go to step «6»(ref-169874-S24030568902004121700000) .
2. NO Go to step «2»(ref-169874-S06301063892004121700000) .

Scheme 31

Step 2: Check Auto-Cruise Control Switch Connector C-202 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «3»(ref-169874-S12420598262004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 15 is not output.

Step 3: Check The Clock Spring

For clock spring information, see AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.

Is the clock spring damaged?

1. YES Go to step «4»(ref-169874-S24204547442004121700000) .
2. NO Replace the clock spring. Then check that diagnostic trouble code 15 is not output.

Step 4: Check Clock Spring Connector C-204 And C-229 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «5»(ref-169874-S29463738462004121700000) .
2. NO Repair or replace the connector. Then check that diagnostic trouble code 15 is not output.

Step 6: Measure The Signal Voltage At Auto-Cruise Control Switch Connector C-202 By Backprobing

1. DO NOT disconnect auto-cruise control switch connector C- 202.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between auto-cruise control switch connector C-202 terminal No. 2 and ground by backprobing. Voltage should measure battery positive voltage. (MAIN switch is at the "ON" position.)
4. Measure the voltage between terminal No. 3 and ground by backprobing. Main Switch Is At The "ON" Position Voltage should measure between 6.8 and 7.2 volts. All Switches Are At The "OFF" Position Voltage should measure between 3.5 and 5.0 volts. "SET" Switch Is At The "ON" Position Voltage should measure between 0.4 and 2.3 volts. "RESUME" Switch Is At The "ON" Position Voltage should measure between 2.3 and 3.5 volts. "CANCEL" Switch Is At The "ON" Position Voltage should measure 1 volt or less.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Go to step «9»(ref-169874-S20289399972004121700000) .
2. NO Go to step «7»(ref-169874-S05916343472004121700000) .

Scheme 32

Step 7: Check The Auto-Cruise Control Switch Connector C-202 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «8»(ref-169874-S13285770502004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 15 is not output.

Step 8: Check The Auto-Cruise Control Switch

1. Remove the auto-cruise control switch.
2. Measure the resistance between the terminals when each of the SET, RESUME, CANCEL and MAIN switch is pressed. (Scheme 33)and (Scheme 34).

Do the measured values correspond?

1. YES Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 15 is not output.
2. NO Replace the auto-cruise control switch. Then check that diagnostic trouble code 15 is not output.

Scheme 33

Scheme 34

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 12 and ground by backprobing. Voltage should measure battery positive voltage. (The MAIN switch is at the "ON" position.)
5. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 9 and ground by backprobing. (Scheme 35) Main Switch Is At The "ON" Position Voltage should measure between 6.8 and 7.2 volts. All Switches Are At The "OFF" Position Voltage should measure between 3.5 and 5.0 volts. "SET" Switch Is At The "ON" Position Voltage should measure between 0.4 and 2.3 volts. "RESUME"Switch Is At The "ON" Position Voltage should measure between 2.3 and 3.5 volts. "CANCEL" Switch Is At The "ON" Position. Voltage should measure 1 volt or less.
6. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that diagnostic trouble code 15 is not output. If diagnostic trouble code 15 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 15 is not output.
2. NO Go to step «10»(ref-169874-S35481246512004121700000) .

Scheme 35

Step 10: Check Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «11»(ref-169874-S34882270622004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 15 is not output.

Step 11: Check The Clock Spring

Is the clock spring in good condition?

1. YES Go to step «12»(ref-169874-S32984046632004121700000) .
2. NO Replace the clock spring. See «AIR BAG RESTRAINT SYSTEMS»(ref-160459) article. Then check that diagnostic trouble code 15 is not output.

Step 12: Check Auto-Cruise Control Switch Connector C- 202, Clock Spring Connectors C-204 And C-229 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «13»(ref-169874-S08775033352004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 15 is not output.

Step 1: Check The Throttle Position Sensor

1. Using scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector.
3. Turn the ignition switch to the "ON" position.
4. Read the MFI-DTC.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Is the MFI-DTC P0121, P0122 or P0123 is output?

1. YES See appropriate SELF DIAGNOSTICS article in ENGINE PERFORMANCE.
2. NO Go to step «2»(ref-169874-S18595816052004122000000) .

Step 2: Measure The Signal Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 1 and ground by backprobing. The measure voltage should measure between 4.0 and 5.5 volts. (When accelerator pedal is fully depressed.) The measure voltage should measure between 0.4 and 1.0 volts. (When accelerator pedal is released.)
5. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Go to step «5»(ref-169874-S01880473962004122000000) .
2. NO Go to step «3»(ref-169874-S03862924912004122000000) .

Step 3: Check Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «4»(ref-169874-S00827665822004122000000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 17 is not output.

Step 5: Measure The Signal Voltage At ECM Connector C- 115

1. Disconnect ECM connector C-115.
2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
3. Measure the voltage between ECM connector C-115 terminal No. 87 and ground. (Scheme 36) The measured voltage should measure between 4.0 and 5.5 volts.
4. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

Is the measured voltage between 4.0 and 5.5 volts?

1. YES Check that diagnostic trouble code 17 is not output. If diagnostic trouble code 17 is output, replace the ECM. Then check that diagnostic trouble code 17 is not output.
2. NO Go to step «6»(ref-169874-S27044358072004122000000) .

Scheme 36

Step 6: Check ECM Connector C-115 And Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «7»(ref-169874-S09118837832004122000000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 17 is not output.

Step 8: Measure The Signal Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. Do not disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 2 and ground by backprobing. The measured voltage should measure between 4.0 and 5.5 volts. (When accelerator pedal is depressed.) The measured voltage should measure between 2.5 volts or less. (When accelerator pedal is released.)
5. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that diagnostic trouble code 17 is not output. If diagnostic trouble code 17 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 17 is not output.
2. NO Replace the auto-cruise control-ECU. Then check that diagnostic trouble code 17 is not output.

Scheme 37

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the ON position.
3. Read the MFI-DTC.
4. Turn the ignition switch to the LOCK (OFF) position.

Is the MFI-DTC P0121, P0122 or P0123 output?

1. YES See appropriate SELF DIAGNOSTIC article in FAULT ISOLATION article.
2. NO Go to step «2»(ref-169874-S37730259172004121700000) .

Step 2: Check The Output Circuit Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. Do not disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 1 and ground by backprobing. (Scheme 38) The measure voltage should measure between 4.0 and 5.5 volts. (When accelerator pedal is fully depressed.) The voltage should measure between 0.4 and 1.0 volts. (When accelerator pedal is released.)
5. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Go to step «5»(ref-169874-S06911288932004121700000) .
2. NO Go to step «3»(ref-169874-S17333024952004121700000) .

Scheme 38

Are the connector and terminals in good condition?

1. YES Go to step «4»(ref-169874-S17715837662004121700000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 17 is not output.

Step 5: Measure The Signal Voltage At PCM Connector C- 116

1. Disconnect PCM connector C-116.
2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
3. Measure the voltage between PCM connector C-116 terminal No. 79 and ground. The measured voltage should measure between 4.0 and 5.5 volts.
4. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

Is the measured voltage between 4.0 and 5.5 volts?

1. YES Check that diagnostic trouble code 17 is not output. If diagnostic trouble code 17 is output, replace the PCM. Then check that diagnostic trouble code 17 is not output.
2. NO Go to step «6»(ref-169874-S39703392132004122000000) .

Step 6: Check PCM Connector C-116 And Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «7»(ref-169874-S05618670472004122000000) .
2. NO Repair or replace connector. Then check that diagnostic trouble code 17 is not output.

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C- 107.
3. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 2 and ground by backprobing. The measured voltage should measure between 4.0 and 5.5 volts. (When accelerator pedal is depressed.) The measured voltage should measure between 2.5 volts or less. (When accelerator pedal is released.)
5. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that diagnostic trouble code 17 is not output. If diagnostic trouble code 17 is output, replace the auto-cruise control-ECU. Then check that diagnostic trouble code 17 is not output.
2. NO Replace the auto-cruise control-ECU. Then check that diagnostic trouble code 17 is not output.

Step 1: Measure The Signal Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 6 and ground by backprobing. (Scheme 39) The measured voltage should measure battery positive voltage.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Is the measured voltage battery positive voltage?

1. YES Go to step «5»(ref-169874-S06492305522004121700000) .
2. No Go to step «2»(ref-169874-S39284050782004121700000) .

Scheme 39

Step 2: Check Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Check auto-cruise control-ECU connector C-107.

Are the connector and terminals in good condition?

1. YES Go to step «3»(ref-169874-S33712464262004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 5: Measure The Ground Circuit Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. Do not disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 14 and ground by backprobing. (Scheme 40) The measured voltage should measure 0.5 volts or less.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Is the measured voltage 0.5 volts or less?

1. YES Go to step «8»(ref-169874-S22981261302004121700000) .
2. NO Go to step «6»(ref-169874-S29144568992004121700000) .

Scheme 40

Step 6: Check Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «7»(ref-169874-S05153374772004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 1: Check If The Stoplight Illuminates

Is the stoplight illuminated?

1. YES Go to step «9»(ref-169874-S37344298262004121700000) .
2. NO Go to step «2»(ref-169874-S08989136612004121700000) .

Step 2: Measure The 12-Volt Supply Circuit Voltage At Stoplight Switch Connector C-102

1. Disconnect stoplight switch connector C-102.
2. Measure the voltage between stoplight switch connector C-102 terminal No. 2 and ground. (Scheme 41) The measured voltage should measure battery positive voltage.

Is the measured voltage battery positive voltage?

1. YES Go to step «6»(ref-169874-S06029816302004121700000) .
2. NO Go to step «3»(ref-169874-S41030164602004121700000) .

Scheme 41

Step 3: Check Stoplight Switch Connector C-102 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «4»(ref-169874-S08464853592004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 4: Check Intermediate Connector C-129 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «5»(ref-169874-S40680557952004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 6: Check The Stoplight Switch

1. Disconnect stoplight switch connector C-102.
2. Connect an ohmmeter to the stoplight switch, and check continuity when the plunger of the stoplight switch is pushed in and when it is released.
3. The stoplight switch is in good condition if the circuit is open when the plunger is pushed in to a depth of within 4 mm (0.2 inch) from the outer case edge surface, and if the resistance value is less than 2 ohms when it is released. (Scheme 42)
4. The check for continuity should be made at terminals No. 1 and 2 of the stoplight switch. (Scheme 43)

Is the stoplight switch in good condition?

1. YES Go to step «7»(ref-169874-S10795721112004121700000) .
2. NO Replace the stoplight switch. Then check that the malfunction is eliminated.

Scheme 42

Scheme 43

Step 7: Check Stoplight Switch Connector C-102 & Intermediate Connector C-129 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «8»(ref-169874-S39035802542004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 4 and ground by backprobing. (Scheme 44) The measured voltage should measure battery positive voltage. (When brake pedal is depressed). The measured voltage should measure 0.5 volts or less. (When brake pedal is not depressed).
5. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
2. NO Go to step «10»(ref-169874-S38719734482004121700000) .

Scheme 44

Step 10: Check Auto-Cruise Control-ECU Connector C-107 & Joint Connector C-105 & Intermediate Connector C-124 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «11»(ref-169874-S00559447162004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 1: Check The Clutch Pedal Position Switch

1. Disconnect clutch pedal position switch connector C-130.
2. Measure the continuity between the terminals. (Scheme 45)

Is the clutch pedal position switch in good condition?

1. YES Go to step «2»(ref-169874-S09062447902004121700000) .
2. NO Replace the clutch pedal position switch. Then check that the malfunction is eliminated.

Scheme 45

1. Remove the auto-cruise control-ECU mounting nut.
2. Do not disconnect auto-cruise control switch connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 13 and ground by backprobing. (Scheme 46) Voltage should measure 0.5 volts or less. (When clutch pedal is depressed.) Voltage should measure battery positive voltage. (When clutch pedal is not depressed.)
5. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
2. NO Go to step «3»(ref-169874-S18217206632004121700000) .

Scheme 46

Step 3: Check Clutch Pedal Position Switch Connector C-130 & Auto-Cruise Control-ECU Connector C-107 & Intermediate Connector C-108 & C-129 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «4»(ref-169874-S23439940772004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 1: Check The Output Circuit Voltage At Park/Neutral Position Switch Connector B-16 By Backprobing

1. DO NOT disconnect Park/Neutral position switch connector B-16.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between terminal No. 10 and ground by backprobing. (Scheme 47) Voltage should be battery positive voltage. (When select lever is in a position other than "N" range.) Voltage should be 0.5 volts or less. (When select lever is in "N" range.)
4. Turn the ignition switch to the LOCK (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
2. NO Go to step «2»(ref-169874-S14251069432004121700000) .

Scheme 47

Step 2: Check Park/Neutral Position Switch Connector B-16 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «3»(ref-169874-S30139154042004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 3: Check The Circuit At The Park/Neutral Position Switch

1. Disconnect the Park/Neutral position switch connector B-16.
2. Measure the continuity or Park/Neutral position switch connector terminals. (Scheme 48)

Does the continuity meet the specifications?

1. YES Go to step «4»(ref-169874-S22846002552004121700000) .
2. NO Replace the Park/Neutral position switch. Then check that the malfunction is eliminated.

Scheme 48

Step 4: Measure The Signal Voltage At Auto-Cruise Control-ECU Connector C-107 By Backprobing

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 13 and ground by backprobing. The measured voltage should measure battery positive voltage. (When select lever is in a position other than "N" range). The measured voltage should measure 0.5 volts or less. (When select lever is in "N" range).
5. Turn the ignition switch to the "LOCK" (OFF) position.

Are all of the measured voltages satisfied?

1. YES Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
2. NO Go to step «5»(ref-169874-S21708809392004121700000) .

Step 5: Check Auto-Cruise Control-ECU Connector C-107 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «6»(ref-169874-S21167750772004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated

Step 6: Check Intermediate Connector C-105 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connector and terminals in good condition?

1. YES Go to step «7»(ref-169874-S13775463092004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 1: Check The Vehicle Speed Sensor

1. Remove the vehicle speed sensor and connect a 3-10 kohm resistor. (Scheme 49)
2. Turn the shaft of the vehicle speed sensor and check that there is voltage between terminals No. 2-3. (One turn equals 4 pulses.)

Is the voltage within specifications?

1. YES Go to step «2»(ref-169874-S03301259542004121700000) .
2. NO Replace the vehicle speed sensor. Then check that the malfunction is eliminated.

Scheme 49

Step 2: Check The Auto-Cruise Vacuum Pump

1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
2. Disconnect the vacuum pump connector.
3. Check the auto-cruise vacuum pump and values according to the following procedure: Connect the positive battery terminal to auto-cruise vacuum pump connector terminal No. 1, and the negative battery terminals No. 2, 3, and 4. Then the vacuum gauge should read 27 kPa (8.0 in Hg) or more. (Scheme 50) The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 2 is disconnected from the negative battery terminal while terminals No. 1 and 3 remain connected. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 3 is disconnected from the negative battery terminal while terminals No. 1, and 2 remain connected.

Are all of the above values satisfied?

1. YES Go to step «3»(ref-169874-S13426771792004121700000) .
2. NO Replace the auto-cruise vacuum pump. Then check to see if the malfunction is eliminated.

Scheme 50

Step 3: Check The Vacuum Actuator

1. Disconnect the vacuum hose from the vacuum actuator, and then connect a hand vacuum pump to the vacuum actuator. (Scheme 51)
2. Apply a vacuum and check that the throttle lever moves and the vacuum is maintained.

Is the vacuum actuator damaged?

1. YES Replace the vacuum actuator. Then check that the malfunction is eliminated.
2. NO Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.

Scheme 51

Step 1: Check The Vehicle Speed Signal

1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the ON position.
3. Read the MFI-DTC.
4. Turn the ignition switch to the LOCK (OFF) position.

Is the MFI-DTC P0720 output?

1. YES See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.
2. NO Go to step «2»(ref-169874-S13279884352004121700000) .

1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
2. Disconnect the vacuum pump connector.
3. Check the auto-cruise vacuum pump and valves according to the following procedure: Connect the positive battery terminal to auto-cruise vacuum pump connector terminal No. 1, and the negative battery terminals No. 2, 3, and 4. Then the vacuum gauge should read 27 kPa (8.0 in Hg) or more. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 2 is disconnected from the negative battery terminal while terminals No. 1 and 3 remain connected. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 3 is disconnected from the negative battery terminal while terminals No. 1 and 2 remain connected.

Are all of the above values satisfied?

1. YES Go to step «3»(ref-169874-S25460821842004121700000) .
2. NO Replace the auto-cruise vacuum pump. Then check that the malfunction is eliminated.

1. Disconnect the vacuum hose from the vacuum actuator, and then connect a hand vacuum pump to the vacuum actuator.
2. Apply a vacuum and check that the throttle lever moves and the vacuum is maintained.

Is the vacuum actuator damaged?

1. YES Replace the vacuum actuator. Then check that the malfunction is eliminated.
2. NO Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.

Scheme 52

Step 1: Check The Auto-Cruise Control Indicator Bulb

1. Remove the combination meter.
2. Check the auto-cruise control indicator bulb.

Is the bulb blown?

1. YES Replace the bulb. Then check that the malfunction is eliminated.
2. NO Go to step «2»(ref-169874-S25815510162004121700000) .

1. Remove the auto-cruise control-ECU mounting nut.
2. DO NOT disconnect auto-cruise control-ECU connector C-107.
3. Turn the ignition switch to the "ON" position.
4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal No. 15 and ground by backprobing. The measured voltage should measure battery positive voltage.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Is the voltage approximately battery positive voltage?

1. YES Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.
2. NO Go to step «3»(ref-169874-S08820887022004121700000) .

Scheme 53

Step 3: Measure The Signal Voltage At Junction Block Connector C-214 By Backprobing

1. DO NOT disconnect junction block connector C-214.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between terminal No. 25 and ground by backprobing. (Scheme 54) The measured voltage should measure battery positive voltage.
4. Turn the ignition switch to the LOCK (OFF) position.

Is the voltage approximately battery positive voltage?

1. YES Go to step «5»(ref-169874-S17761364962004121700000) .
2. NO Go to step «4»(ref-169874-S23845964062004121700000) .

Scheme 54

Step 4: Check Junction Block Connector C-211 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors in good condition?

1. YES Replace the junction block. Then check that the malfunction is eliminated. (Scheme 55)
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Scheme 55

Step 5: Check Combination Meter Connector C-01 And C-02 And Intermediate Connector C-21 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «6»(ref-169874-S38416621432004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

Step 7: Check Combination Meter

1. Remove the combination meter and measure at the combination meter side. (Scheme 56)
2. Measure the continuity between combination meter C-01 terminal No. 9 and combination meter C-02 terminal No. 33. The measured continuity should be less than 2 ohms.
3. Install the combination meter.

Is the continuity less than 2 ohms?

1. YES Go to step «8»(ref-169874-S36804023642004121700000) .
2. NO Replace the combination meter. Then check that the malfunction is eliminated.

Scheme 56

Step 8: Check Auto-Cruise Control-ECU Connector C-107 And Intermediate Connector C-108 For Loose, Corroded Or Damaged Terminals, Or Terminals Pushed Back In The Connector

Are the connectors and terminals in good condition?

1. YES Go to step «9»(ref-169874-S00166333392004121700000) .
2. NO Repair or replace connector. Then check that the malfunction is eliminated.

AUTO-CRUISE CONTROL SWITCH CHECK

1. Turn the ignition switch to the ON position.
2. Check that the indicator light within the combination meter illuminates when the main switch is switched ON. (Scheme 57)

Scheme 57

AUTO-CRUISE CONTROL SETTING

1. Switch ON the main switch.
2. Drive at the desired speed, above approximately 40 km/h (25 mph).
3. Push the auto-cruise control switch down. (Scheme 58)
4. Check to be sure that when the switch is released, the speed is the desired constant speed.

Scheme 58

SPEED-INCREASE SETTING

1. Set to the desired speed.
2. Push the auto-cruise control switch to the ACC/RES position. (Scheme 59)
3. Check to be sure that acceleration continues while the switch is held, and that after it is released the constant speed at the time when it was released becomes the driving speed.

Scheme 59

SPEED REDUCTION SETTING

1. Set to the desired speed.
2. Push the auto-cruise control switch in the COAST/SET direction.
3. Check to be sure that deceleration continues while the switch is pressed, and that after it is released the constant speed at the time when it was released becomes the driving speed.

RETURN TO THE SET SPEED BEFORE CANCELLATION AND AUTO-CRUISE CONTROL CANCELLATION

1. Set the auto-cruise speed control.
2. When any of the following operations are performed while at constant speed during auto-cruise control, check is normal driving is resumed and deceleration occurs. The auto-cruise control switch is pushed in the ON/OFF direction. (Scheme 60) The brake pedal is depressed. The selector lever is moved to the "N" range.
3. At a vehicle speed of 40 km/h (25 mph) or higher, check is when the RESUME switch is switched ON, the vehicle speed returns to the speed before auto-cruise control driving was cancelled, and constant speed driving occurs.
4. When the main switch is turned to OFF while driving at constant speed, check is normal driving is resumed and deceleration occurs.

Scheme 60

Stoplight Switch

1. Disconnect the connector.
2. Check for continuity between the terminals of the switch. (Scheme 61)

Scheme 61

Clutch Pedal Position Switch (M/T)

1. Disconnect the connector.
2. Check for continuity between the terminals of the switch. (Scheme 62)

Scheme 62

Scheme 63

Checking The Terminal Resistance

1. Disconnect the throttle position sensor connector.
2. Measure resistance between the throttle position sensor side connector terminal No. 2 and terminal No. 3. Standard value is 2.0-4.0 kohm. (Scheme 64)
3. Measure resistance between the throttle position sensor side connector terminal No. 1 and terminal No. 2. (Scheme 65) The normal condition allows the throttle valve to slowly open until fully open from the idle position. It changes smoothly in proportion to the opening angle of the throttle valve.
4. If resistance is outside the standard value, or if it doesn't change smoothly, replace the throttle position sensor.

Scheme 64

Scheme 65

Check Using Oscilloscope

1. Disconnect the throttle position sensor connector and connect the test harness special tool MB991907 in between. (All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position sensor side connector terminal No. 1. (Scheme 66)
3. Turn the ignition switch to the ON position.
4. Slowly move the throttle lever from the idle position to the full throttle position and check then if the waveform is free from any noise. (Scheme 67)
5. If any noise is recognized, replace the throttle position sensor.

Scheme 66

Scheme 67

Auto-Cruise Vacuum Pump

1. Disconnect the vacuum hose from the auto-cruise vacuum pump and connect a vacuum gauge to the vacuum pump.
2. Disconnect the vacuum pump connector.
3. Check the auto-cruise vacuum pump and valves according to the following procedure: Connect the positive battery terminal to auto-cruise vacuum pump connector terminal No. 1, and the negative battery terminal to terminals No. 2, 3, and 4. Then the vacuum gauge should read 27 kPa (8.0 in Hg) or more. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 2 is disconnected from the negative battery terminal while terminals No. 1 and 3 remain connected. The vacuum should be maintained when terminal No. 4 is disconnected from the negative battery terminal while terminals No. 1, 2, and 3 remain connected. Then the vacuum gauge should read 0 kPa (0 in Hg) when terminal No. 3 is disconnected from the negative battery terminal while terminals No. 1, and 2 remain connected.

Vacuum Actuator

1. Disconnect the vacuum hose from the vacuum actuator, and connect a hand vacuum pump to the actuator.
2. Check that the throttle lever operates when applying vacuum, and the vacuum is maintained.

AUTO-CRUISE CONTROL CHECK

Measure the resistance between the terminals when each of the SET, RESUME, CANCEL and MAIN switches is pressed. If the values measured at the time correspond, the resistance values are correct. (Scheme 68)

Scheme 68

VEHICLE SPEED SENSOR CHECK (M/T)

1. Remove the vehicle speed sensor and connect a 3-10 kilohms resistor. (Scheme 69)
2. Turn the shaft of the vehicle speed sensor and check that there is voltage between terminals No. 2 and No. 3 (1 turn is equal to 4 pulses).
3. If within the standard value, the vehicle speed sensor is OK. If not within the standard value, replace the vehicle speed sensor. Standard value is 0 or battery voltage (1 turn is equal to 4 pulses).

Scheme 69

Scheme 70

Scheme 71