Mazda 6 2002 Workshop Manual page 1036

ON-BOARD DIAGNOSTIC [CRUISE CONTROL SYSTEM]
STEP
5 INSPECT TR SWITCH
• Inspect TR switch.
(See K–14 TRANSAXLE RANGE (TR) SWITCH
INSPECTION)
• Is TR switch okay?
* 6 INSPECT WIRING HARNESS BETWEEN TR
SWITCH AND GROUND FOR CONTINUITY
• Disconnect TR switch connector.
• Is there continuity between TR switch
connector terminal A and ground?
* 7 INSPECT WIRING HARNESS BETWEEN
CRUISE ACTUATOR AND TR SWITCH FOR
CONTINUITY
• Disconnect cruise actuator connector.
• Is there continuity between cruise actuator
connector terminal F and TR switch
connector terminal F?
End Of Sie
DTC 37
DTC 37 Vehicle speed sensor
DETECTION
• Vehicle speed signal is not detected at cruise actuator connector terminal A.
CONDITION
• Cruise actuator malfunction
POSSIBLE • DSC HU/CM (with ABS/TCS HU/CM)
CAUSE • Open or short circuit in wiring harness between ABS/TCS cruise actuator and DSC HU/CM (without
DSC: ABS/TCS HU/CM)
Diagnostic procedure
STEP
1 INSPECT SPEEDOMETER OPERATION
• Does speedometer operate correctly?
2 INSPECT PCM ON-BOARD DIAGNOSTIC
• Drive the vehicle at more than 40 km/h {25 mph}.
• Check the DTC for PCM ON-BOARD
DIAGNOSTIC.
• Is DTC P0500 displayed?
* 3 VERIFY WHICH IS MALFUNCTIONING‚ WIRING
HARNESS WITH DSC OR CRUISE ACTUATOR
• Disconnect cruise actuator connector and DSC
HU/CM connector.
• Is there continuity between cruise actuator
connector terminal A and DSC HU/CM connector
terminal AE?
With ABS/TCS
• Disconnect cruise actuator connector and ABS/
TCS HU/CM connector.
• Is there continuity between cruise actuator
connector terminal A and ABS/TCS connector
terminal V?
T–184
INSPECTION
INSPECTION
Yes Go to net step.
No Repair TR switch.
(See K–15 TRANSAXLE RANGE (TR) SWITCH
REMOVAL/INSTALLATION)
Yes Go to net step.
No Repair wiring harness (TR switch—ground ) or inspect
starter.
Yes Replace cruise actuator.
(SeeT–110 CRUISE ACTUATOR REMOVAL/
INSTALLATION)
No Repair wiring harness. (cruise actuator—TR switch)
Yes Go to net step.
No Perform instrument cluster input/output check
mode.
(See T–75 INSTRUMENT CLUSTER INPUT/
OUTPUT CHECK
Yes Go to applicable DTC inspection.
No Go to net step.
Yes Replace cruise actuator.
(See T–110 CRUISE ACTUATOR REMOVAL/
INSTALLATION)
No Repair wiring harness.
With DSC
(DSC HU/CM—Cruise actuator)
With ABS/TCS
(ABS/TCS HU/CM—Cruise actuator)
ACTION
A6E817266350W07
ACTION
MODE)