Speed Control Diagnostics (01-047/10)

Publication date: 2010-08-30
Reference number: 01-047/10
Supersedes refnos: 01-006/04

SPEED CONTROL DIAGNOSTICS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 01-047/10, Date of Issue: August 30, 2010

MAZDA:	2001-2006 Tribute; 2000-2006 B-Series
SECTION:	01 - Engine
BULLETIN NO.:	047/10

Superceded Bulletin(s): 01-006/04, Date of Issue: February 6, 2004

BULLETIN NOTE

This bulletin supersedes the previous bulletin 01-006/04, issued on 02/06/04. The APPLICABLE MODEL(S)/VINS and SERVICE INFORMATION have been revised.

APPLICABLE MODEL(S)/VINS

2001-2006 Tribute

2000-2006 B-Series

DESCRIPTION

Stand-alone speed control system diagnostic updates have been made in 2006 Tribute model year and newer Workshop Manuals (WSM). These diagnostic updates also apply to 2000-2005 model year vehicles. This TSB provides these WSM updates for 2000-2005 model year vehicles.

Follow the Service Procedures and Diagnostic Tips in this Service Bulletin to assist with accurate diagnosis and repair of speed control issues. Start by running cruise control (speed control) servo integrated self test diagnostics. The servo has integrated self test diagnostics which is a key tool in quickly and accurately diagnosing speed control system faults.

SERVICE INFORMATION

NOTE:

THE SELF-TEST IS COMPRISED OF TWO PARTS. THE FIRST PART IS A STATIC CHECK OF THE CRUISE CONTROL ELECTRONICS MODULE AND SYSTEM. THE SECOND PART IS A DYNAMIC PULL-TEST TO CHECK THE ACTUATOR MOTOR AND GEAR MECHANISM.
THE MODULE TIMES OUT IF EACH BUTTON IS NOT PRESSED WITHIN 1 SECOND OF THE PREVIOUS BUTTON. IF A MODULE TIME OUT OCCURS (SPEED CONTROL LAMP STOPS FLASHING PART WAY THROUGH THE TEST), THE PROCEDURE MUST BE RE-INITIATED.
IN ORDER TO CORRECTLY PERFORM THE SELF-TEST ON VEHICLES EQUIPPED WITH A MANUAL TRANSMISSION, THE CLUTCH PEDAL SHOULD BE DEPRESSED ON TRIBUTE AND SHOULD NOT BE DEPRESSED ON B-SERIES. ON VEHICLES EQUIPPED WITH AN AUTOMATIC TRANSMISSION, THE TRANSMISSION SELECTOR LEVER NEEDS TO BE IN THE "N" POSITION FOR TRIBUTE AND "P" POSITION FOR B-SERIES.

WARNING: Emergency brake must be fully engaged when conducting the test.

NOTE: REVIEW THE FOLLOWING STEPS BEFORE CARRYING OUT THE SELF-TEST DIAGNOSTIC PROCEDURE.

Self Test Diagnostic Procedure - Static Test
Enter self-test diagnostic procedure by firmly pressing and holding the cruise control OFF, turning the ignition switch to ON, making sure the engine does not start and is not running. The cruise control indicator lamp on the instrument panel will flash ONCE to indicate that speed control module entered the diagnostic mode. (Five additional flashes at this point indicate a defective Cruise Control subsystem/servo)
Release the OFF switch.
Press the remaining switches in this sequence below:
NOTE: If the ON switch is not pressed within 5 seconds after entering diagnostic mode, the module times out and the procedure must be started over.
1. ON
2. RESUME (RSM)
3. COAST (CST)
4. SET/ACCEL
  NOTE:
  - THERE WILL BE A SLIGHT DELAY FROM WHEN THE LAST BUTTON IS PRESSED AND THE CLUSTER LAMP FLASHES DIAGNOSTIC CODES.
  - IF THE SELF-TEST WILL NOT START OR CANNOT BE COMPLETED AFTER MULTIPLE ATTEMPTS, GO TO THE VEHICLE WSM SYMPTOM CHART AND FOLLOW DIAGNOSTICS.
  - THE CRUISE CONTROL INDICATOR LAMP WILL FLASH AS EACH SWITCH IS PRESSED. PRESS EACH SWITCH LISTED IN THE SEQUENCE IMMEDIATELY AFTER THE LIGHT GOES OUT FOR THE PREVIOUS SWITCH.

The cruise control indicator lamp flash with the last button (SET/ACCEL) indicates that the STATIC test passed.

If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.
If the lamp does not flash with the last button and additional flashes occur, follow the chart below for trouble codes:

CLUSTER LAMP FLASHES DIAGNOSTIC CODES

Sequence of Button Press	Button	Resulting Cluster Lamp Flashes
1	Off	1 Flash: confirms button was pressed correctly 5 Flashes: indicates a faulty speed control module
2	On	1 Flash: confirms button was pressed correctly
3	Resume	1 Flash: confirms button was pressed correctly
4	Coast	1 Flash: confirms button was pressed correctly
5	Set/Accel	There is a delay which is followed by diagnostic flash codes consisting of 0 to 5 flashes. The dynamic test occurs within .25 seconds after the flash codes. 0 Flashes: no flash after last button pressed - suspect circuitry or speed control steering wheel switches 1 Flash: static test passed 2 Flashes: BPP switch is damaged, circuit is damaged or the brake pedal or clutch is applied 3 Flashes: brake deactivation switch is open or circuit is damaged 4 Flashes: Tribute the clutch (CPP)/neutral switch (TR sensor) circuit is damaged, clutch switch is damaged or the clutch is not applied. 4 Flashes: B-Series indicates the speed signal is open or damaged. 5 Flashes: suspect circuitry or module.

Self Test Diagnostic Procedure - Dynamic Test.
1. Within 0.25 seconds after the static test has completed, the cruise control actuator carries out a dynamic pull test. The actuator automatically pulls the cruise control cable 0.04 to 0.39" (1 to 10 mm) to move the throttle from idle position and then releases the cruise control cable returning the throttle to idle position.
  NOTE: 200-2006 TRIBUTE: THE CRUISE CONTROL MODULE HOLDS THE THROTTLE PULL FOR 3 SECONDS PRIOR TO RELEASING.
2. During dynamic throttle-pull, you will need to quickly go to engine compartment or have someone else observe actuator/cable operation to check for any binding or sticking of actuator cable to throttle lever.
3. Make sure throttle returns to idle position.
  NOTE: If the throttle is not actuated (moved) go to the 2005 or 2006 WSM Symptom chart for dynamic pull test failure.
Return Ignition Switch to OFF position.
Self-Test complete.

SPEED CONTROL DIAGNOSTIC TIPS

Servo Pin-Out Test Tips

NOTE: MEASURING THE RESISTANCE OF A SERVO WILL INDICATE THAT A SERVO IS BAD IF READINGS ARE OUTSIDE THE RANGES SPECIFIED BELOW. HOWEVER, A SERVO CAN HAVE RESISTANCE READINGS WITHIN THE SPECIFIED RANGES AND STILL BE FAULTY.

The following readings are the expected values for a good servo.

Resistance between Pins 6 and 10 should measure less than 5 ohms. This is the ground circuit through the module. Resistance between Pins 7 and 10 will vary with polarity, the type of meter, and source voltage of the meter. Also measurements between Pins 7 and 10 can be any of the following: an open circuit, increasing reading (as a capacitor charging), or changing value (re-apply leads and different value indicated), or a stable reading of 10,000 ohms or greater are all valid results as this is a solid state circuit.

DST Testing Tips (TPS PID)

Pinpoint Test: The Speed Control Does Not Disengage When The Brakes Are Applied
With the vehicle speed above 30 MPH (48 Km/h) engage the speed control. Then check to see if the TPS PID returns to base voltage when the brakes are applied. If it does return to base voltage, then the speed control system is working. Need to advise customer that tapping the brakes deactivates speed control and that the brakes must be applied to make the vehicle slow down. On Tribute, the brake pedal should be depressed at least 13/32" (10 mm) in order to deactivate speed control.

NOTE: CHECK FOR CALIBRATION SERVICE MESSAGES RELATING TO DASHPOT OR IDLE SPEED-CONTROL UPDATES.
Pinpoint Test: The Speed Control Does Not Disengage When The Clutch is Applied.
Check to see if the TPS PID returns to base voltage when the clutch is pressed. If it does then the speed control system is working. Need to advise customer that pressing clutch deactivates speed control and that the brakes must be applied to make the vehicle slow down.

NOTE: CHECK FOR CALIBRATION SERVICE MESSAGES RELATING TO DASHPOT OR IDLE SPEED CHANGES. ALSO A SLIGHT ENGINE RPM FLARE MAY OCCUR ON SOME VEHICLES WHEN SPEED CONTROL IS DISENGAGED WHICH IS A NORMAL CONDITION.

Speed Signal Testing Tips

NOTE:

A FAULTY VEHICLE SPEED SIGNAL TO THE SERVO CAN RESULT IN INTERMITTENT, IRREGULAR OR INOPERATIVE SPEED CONTROL.
FOR VEHICLES THAT HAVE OSS OR HALL EFFECT VEHICLE SPEED SIGNALS TO THE SERVO, REFER TO WSM FOR DIAGNOSTICS.

To verify that the speed control signal sent to the servo is valid, the following inspection may be done for ABS and PCM generated speed signals:

Disconnect speed control module (C122).
Connect DVOM set to Hz to C122 Pin 3 harness side and C122 Pin 10 (ground) harness side.
Start the vehicle; place the transmission in DRIVE, test drive vehicle between 25-30 MPH (40-48 Km/h).
Measure the frequency between the speed control actuator C122 Pin 3 harness side and C122 Pin 10 (ground) harness side. Divide frequency by 2.2 to give MPH and compare to speedometer reading. Measure AC Volts and record.
If the AC Voltage is greater than 4.5V and the frequency reading does match the speedometer reading then the speed signal is valid. If further diagnostics are required see WSM.

Deactivator Switch Inspection Tips

A faulty deactivator switch can result in intermittent or inoperative speed control. There are two types of deactivator switches; a brake line pressure switch, which is integrated into the brake master cylinder, and a pedal travel switch, which is connected to the brake pedal arm.

Proper switch function should be confirmed. Inoperative switches of both types should be inspected for connector corrosion or pin push-out. Pedal travel switches should also be inspected for proper mechanical adjustment relative to brake pedal travel.

ADDITIONAL REFERENCE INFORMATION

Speed Control Servo Operation and Function

NOTE: ALL FUNCTIONALITY LISTED BELOW IS PERFORMED WITH CONNECTORS CONNECTED AND KEY IN RUN POSITION UNLESS OTHERWISE NOTED.

Pin 1 - Indicator. (if used) Speed control servo grounds this circuit to turn the speed control lamp in cluster on during operation. This will not affect operation of system.

Pin 2 - Clutch/TRS Input (Tribute Only). Signal comes from clutch switch (MT) or TRS (AT). On the harness side the signal can be measured by connecting a DVOM, set to ohms, between Pins 2 and B-. With clutch depressed (MT) or in N (AT) you should read 0 ohms, which disables speed control. With clutch released (MT) or in D (AT) signal should read greater than 10,000 ohms, which enables speed control operation.

Pin 3 - VSS Input.

NOTE: Performed with engine running and vehicle driven.)

Signal comes from PCM, ABS, OSS, hall effect sensor depending on application. Except for hall effect sensor, the signal can be measured by removing Connector C122 and measuring the frequency between Pins 3 and 10 with a DVOM set to AC Hz. The signal should measure 2.2 Hz/MPH. The vehicle must be traveling 30 MPH (48 Km/h) before the system will set, therefore a minimum of 66 Hz must be observed. Take note that on vehicles equipped with SVC (speed sensitive volume control), an internal problem within the radio can bring signal down to 0 Hz even though it reads correctly in PCM PIDs. If signal is missing disconnect radio and retest. Note, for vehicles with a hall effect input to the speed control servo, see WSM for speed signal verification.

Pin 4 - Brake Switch Input (BOO/BPP).

NOTE: ENSURE THAT BRAKE LAMPS ARE FUNCTIONING CORRECTLY.

Tribute vehicles (both A/T and M/T) and B-Series vehicles with automatic transmissions: With a DVOM set to ohms, measure resistance between Pins 4 and B- with brake pedal not depressed, you should get less than 5 ohms. Then measure voltage with brake pedal depressed, you should get 12 V. Operation: The servo sends out a reference voltage on Pin 4 (4-7V) which is grounded through the brake lamps or switched directly to ground.

B-Series vehicles with manual transmissions: With a DVOM set to ohms, measure resistance between Pin 4 and B- with brake pedal not depressed and clutch pedal not depressed, you should get less than 5 ohms. Next, depress clutch pedal only, measuring resistance, you should get an open circuit/infinite resistance. Then measure voltage with brake pedal depressed, clutch pedal not depressed and you should get 12 volts. Repeat with both pedals depressed and you should get 0 volts. Operation: The servo sends out a reference voltage on Pin 4 (4-7V) which is grounded through the brake lamps or switched directly to ground when the clutch pedal is not depressed.

Pin 5 - Control Switch Input.

NOTE: (Performed with key in OFF position.)

Remove Connector C122, using a DVOM set to resistance, measure the resistance between Pins 5 and 6. See table of resistance readings below for each switch when it is depressed.

RESISTANCE REFERENCE CHART

Speed Control Switch	Resistance Value
Coast	Between 114 and 126 ohms
Set/Accel	Between 646 and 714 ohms
Resume	Between 2,090 and 2,310 ohms
Off	Less than 5 ohms
No Buttons Pressed	Infinite

Pin 6 - Control Switch Return. This is the return side of the switches, which are grounded internally to the servo to Pin 10. If test for Pin 5 checks good then Pin 6 is functioning normally.

Pin 7 - Power. Remove Connector C122, Using a DVOM set to DC volts, measure the voltage between Pin 7 and ground. You should read greater than 10 volts with the key in the run position. Record the voltage from Pin 7 to ground, then re-measure with a test lamp (1156) from Pin 7 to ground, to ensure current carrying capability. The difference between the two measurements should be less than 0.3 VDC. If voltage drop test fails then check wiring.

Pin 8 - Not used.

Pin 9 - Brake Deactivator Switch (BPS). This is a redundant shutoff switch. Without depressing the brake pedal, measure voltage on Pin 9, and re-measure with a test lamp (1156) from Pin 9 to ground, to ensure current carrying capability. The difference between the two measurements should be less than 0.3 VDC. The system requires enough current at this pin to engage properly. If voltage drop test fails, check for corroded wiring or deactivation switch. You should measure 0 volts at Pin 6 when the brake pedal is depressed firmly.

An alternate to the voltage drop test would be to disconnect the switch connector and measure the switch resistance. It should be less than 5 ohms. If the switch is suspected, a bypass test may also be done: On the harness side of the BPS connector, connect a jumper between the two deactivation switch pins and drive vehicle above 30 MPH (48 Km/h). If speed control engages then the brake deactivation switch was faulty, otherwise wiring is at fault

Pin 10 - Ground. Using a DVOM set to DC volts, measure the voltage between B+ and Pin 10. You should read greater than 10 volts. Record the voltage between B+ and Pin 10, then re-measure with a test lamp (1156) from B+ to Pin 10. The difference between the two measurements should be less than 0.3 VDC. If voltage drop test fails then check wiring. This verifies circuit can carry proper load as well as continuity to ground.

WARRANTY INFORMATION

NOTE: This bulletin is for information and diagnostic support only. Use existing warranty information for warranty repairs and claims.