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DTC C1949, C1950 [DSC]

id040220875200

DTC | C1949, C1950 | Combined sensor (forward G-sensor)
DETECTION CONDITION | • 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 s • C1950: - 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
POSSIBLE CAUSE | • Open circuit in harness between combined 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 combined sensor terminal A • Open circuit, short to power, or short to ground in harness between DSC HU/CM terminal S and combined sensor terminal F • Open circuit in harness between combined sensor terminal E and DSC HU/CM terminal Y • Malfunction of combined sensor

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT COMBINED SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn ignition key to ON (engine OFF). • Measure voltage between combined sensor terminal C (harness side) and ground. • Is voltage 4.5-5.5 V? | Yes | Go to next step.
No | Repair or replace harness for open circuit between combined sensor terminal C and ignition switch, then go to Step 8.
2 | INSPECT COMBINED SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Turn ignition key to OFF. • Disconnect DSC HU/CM and combined sensor connectors. • Inspect continuity between DSC HU/CM terminal Y (harness side) and combined sensor terminal E (harness side). • Is there continuity? | Yes | Go to next step.
No | Repair or replace harness for open circuit between DSC HU/CM terminal Y and combined sensor terminal E, then go to Step 8.
3 | INSPECT FORWARD-G SENSOR PART SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect continuity between DSC HU/CM terminal V (harness side) and combined sensor terminal A (harness side). • Is there continuity? | Yes | Go to next step.
No | Repair or replace harness for open circuit between DSC HU/CM terminal V and combined sensor terminal A, then go to Step 8.
4 | INSPECT FORWARD-G SENSOR PART SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn ignition key to OFF. • Inspect continuity between DSC HU/CM terminal V (harness side) and ground. • Is there continuity? | Yes | Repair or replace harness for short to ground circuit between DSC HU/CM terminal V and combined sensor terminal A, then go to Step 8.
No | Go to next step.
5 | INSPECT DIAGNOSIS SIGNAL CIRCUIT FOR SHORT FOR OPEN CIRCUIT • Turn ignition key to OFF. • Inspect continuity between DSC HU/CM terminal S (harness side) and combined sensor terminal F. • Is there continuity? | Yes | Repair or replace harness for open circuit between DSC HU/CM terminal S and combined sensor terminal F, then go to Step 8.
No | Go to next step.
6 | INSPECT DIAGNOSIS SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn ignition key to OFF. • Inspect continuity between DSC HU/CM terminal S (harness side) and ground. • Is there continuity? | Yes | Repair or replace harness for short to ground circuit between DSC HU/CM terminal S and combined sensor terminal F, then go to Step 8.
No | Go to next step.
7 | INSPECT COMBINED SENSOR • Inspect combined sensor. • Is it normal? | Yes | Go to next step.
No | Replace combined sensor, then go to next step.
8 | VERIFY TROUBLESHOOTING COMPLETED • Clear DTC from memory. (See Clearing DTCs Procedures.) • Is same DTC present? | Yes | Replace DSC HU/CM, then go to next step.
No | Go to next step.
9 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.