DTC C1730, C1949, C1950

id040200876500

DTC
C1730, C1949, C1950
G sensor
DETECTION CONDITION
•  C1730
―  Voltage to G sensor is detected out of range
•  C1949
―  Monitor voltage of G sensor is detected at 4.7 Vor more, or 0.3 V or less for more than 1 s.
•  C1950
―  G sensor 0-point correction value is default or more
―  Output voltage value from G sensor remains absolutely unchanged
POSSIBLE CAUSE
•  Open circuit in harness between ABS HU/CM terminal V and G sensor terminal C
•  Open, short to power, or short to ground circuit in harness between ABS HU/CM terminal P and G sensor terminal B
•  Open circuit in harness between ABS HU/CM terminal W and G sensor terminal A
•  Malfunction of G sensor

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT G SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Turn ignition switch or engine switch to ON (engine OFF).
•  Measure voltage between G sensor terminal C (harness side)and ground.
•  Is voltage B+?
Yes
Go to the next step.
No
Repair or replace harness for open circuit between G sensor terminal C and ignition switch or engine switch, then go to Step 7.
2
INSPECT G SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Turn ignition switch or engine switch to OFF.
•  Disconnect ABS HU/CM and G sensor connectors.
•  Inspect continuity between ABS HU/CM terminal W (harness side) and G sensor terminal A (harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace harness for open circuit between ABS HU/CM terminal W and G sensor terminal A, then go to Step 7.
3
INSPECT G SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Inspect continuity between ABS HU/CM terminal P (harness side) and G sensor terminal B (harness side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace harness for open circuit between ABS HU/CM terminal P and G sensor terminal B, then go to Step 7.
4
INSPECT G SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
•  Turn ignition switch or engine switch to ON (engine OFF).
•  Measure voltage between ABS HU/CM terminal P (harness side) and ground.
•  Is voltage B+?
Yes
Repair or replace harness for short to power circuit between ABS HU/CM terminal P and G sensor terminal B, then go to Step 7.
No
Go to the next step.
5
INSPECT G SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Turn ignition switch or engine switch to OFF.
•  Inspect continuity between ABS HU/CM terminal P (harness side) and ground.
•  Is there continuity?
Yes
Repair or replace harness for short to ground circuit between ABS HU/CM terminal P and G sensor terminal B, then go to Step 7.
No
Go to the next step.
6
INSPECT G SENSOR
•  Inspect the G sensor.
•  Is it normal?
Yes
Go to the next step.
No
Replace the G sensor, then go to next step.
(See G SENSOR REMOVAL/INSTALLATION.)
7
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the memory.
•  Are the same DTCs present?
Yes
Replace the ABS HU/CM, then go to next step.
(See ABS HU/CM REMOVAL/INSTALLATION.)
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.