Dtc C1949, C1950 - Mazda Mazda6 Workshop Manual Supplement

Diagnostic procedure
STEP
1 CHECK FOR PCM FOR DTCs
• Turn ignition key to OFF.
• Connect WDS or equivalent to DLC-2
• Turn ignition key to ON (engine OFF).
• Is DTC for engine control system obtained?
2 MONITOR CAN SIGNAL
• Access PID RPM and TP using WDS or
equivalent.
• Are engine speed and throttle position within
specification?
3 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory.
• Start engine.
• Is same DTC present?
End Of Sie

DTC C1949, C1950

Caution
• When attaching the tester lead to the DSC HU/CM connector, the SST (49 G066 004) must be used.
DTC C1949, C1950
• C1949:
— Monitor voltage of forward-G sensor is detected at 4.5 V or more, or 0.5 V or less.
— Monitor voltage difference of 0.4 V or more within 1 cycle is detected 8 times in 1 second.
DETECTION
• C1950:
CONDITION
— Forward-G sensor 0-point correction value is default or more
— Output voltage value from G sensor remains absolutely unchanged
— Difference between estimated G-force calculated from 2 channels exceeds specification
• Open circuit in harness between combine sensor terminal C and DSC HU/CM terminal P
• Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal V and
combine sensor terminal A
POSSIBLE
• Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal S and
CAUSE
combine sensor terminal F
• Open circuit in harness between combine sensor terminal E and DSC HU/CM terminal Y
• Malfunction of combine sensor
ON-BOARD DIAGNOSTIC
INSPECTION
Combine sensor (forward G-sensor)
Yes Follow inspection procedures for engine control system.
No Go to next step.
Yes Go to next step.
No Follow inspection procedures for engine control system.
Yes Replace DSC HU/CM, then go to next step.
No Troubleshooting completed.
ACTION
A6E697067650203
P–27
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