DTC C1279, C1280, C1281, C1282, C1951, C1952, C1959, C2768


id040200801700

DTC
C1279, C1280, C1281, C1282, C1951, C1952, C1959, C2768
Combined sensor system
DETECTION CONDITION
•  C1279
―  The yaw rate value from the combined sensor (yaw rate part) exceeds specification while the vehicle is stopped or while accelerating from a standstill.
•  C1280
―  The difference between the yaw rate value calculated by each sensor and the yaw rate value from the combined sensor (yaw rate part) exceeds specification.
•  C1281
―  The difference between the lateral-G value calculated by each sensor and the lateral-G value from the combined sensor (lateral-G part) exceeds specification.
•  C1282
―  Specified signal pattern from combined sensor has not output after the ignition switch is turned to the ON position.
•  C1951
―  The monitor voltage from the combined sensor (lateral-G part) is not within specification.
•  C1952
―  The monitor voltage from the combined sensor (yaw rate part) is not within specification.
•  C1959
―  The lateral-G value from the combined sensor (lateral-G part) exceeds specification.
•  C2768
―  There is an abnormality in the signal from the combined sensor (yaw rate part).
POSSIBLE CAUSE
•  Open circuit in the wiring harness between ignition switch and combined sensor terminal E or short circuit to ground
•  Open circuit in the wiring harness between DSC HU/CM terminal Y and combined sensor terminal F or short circuit to ground
•  Open circuit in the wiring harness between DSC HU/CM terminal AA and combined sensor terminal B or short circuit to ground
•  Open circuit in the wiring harness between DSC HU/CM terminal AI and combined sensor terminal D
•  Open circuit in the wiring harness between DSC HU/CM terminal AE and combined sensor terminal A or short circuit to ground
•  Open circuit in the wiring harness between DSC HU/CM terminal AB and combined sensor terminal C or short circuit to ground
•  Combined sensor malfunction
•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT COMBINED SENSOR POWER SUPPLY FOR OPEN CIRCUIT
•  Turn the ignition switch to the ON position (engine off).
•  Measure voltage between combined sensor terminal E (harness-side) and ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between combined sensor terminal E and ignition switch, then go to Step 12.
2
INSPECT COMBINED SENSOR GROUND FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Disconnect DSC HU/CM and combined sensor connectors.
•  Inspect for continuity between DSC HU/CM terminal Y (harness-side) and combined sensor terminal F (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between DSC HU/CM terminal Y and combined sensor terminal F, then go to Step 12.
3
INSPECT COMBINED SENSOR (YAW RATE PART) SIGNAL FOR OPEN CIRCUIT
•  Inspect for continuity between DSC HU/CM terminal AA (harness-side) and combined sensor terminal B (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AA and combined sensor terminal B, then go to Step 12.
4
INSPECT COMBINED SENSOR (YAW RATE PART) SIGNAL FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between DSC HU/CM terminal AA (harness-side) and ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AA and combined sensor terminal B, then go to Step 12.
No
Go to the next step.
5
INSPECT COMBINED SENSOR (LATERAL-G PART) SIGNAL FOR OPEN CIRCUIT
•  Inspect for continuity between DSC HU/CM terminal AI (harness-side) and combined sensor terminal D (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AI and combined sensor terminal D, then go to Step 12.
6
INSPECT COMBINED SENSOR (LATERAL-G PART) SIGNAL FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between DSC HU/CM terminal AI (harness-side) and ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AI and combined sensor terminal D, then go to Step 12.
No
Go to the next step.
7
INSPECT REFERENCE SIGNAL FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Inspect for continuity between DSC HU/CM terminal AE (harness-side) and combined sensor terminal A (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AE and combined sensor terminal A, then go to Step 12.
8
INSPECT REFERENCE SIGNAL FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between DSC HU/CM terminal AE (harness-side) and ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AE and combined sensor terminal A, then go to Step 12.
No
Go to the next step.
9
INSPECT TEST SIGNAL FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Inspect for continuity between DSC HU/CM terminal AB (harness-side) and combined sensor terminal C (harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between DSC HU/CM terminal AB and combined sensor terminal C, then go to Step 12.
10
INSPECT TEST SIGNAL FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between DSC HU/CM terminal AB (harness-side) and ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal AB and combined sensor terminal C, then go to Step 12.
No
Go to the next step.
11
INSPECT COMBINED SENSOR
•  Inspect the combined sensor.
•  Is the combined sensor normal?
Yes
Go to the next step.
No
Replace the combined sensor, then go to the next step.
12
VERIFY DTC TROUBLESHOOTING COMPLETED.
•  Clear the DTC from the memory.
•  Are the same DTCs present?
Yes
Replace the DSC HU/CM, then go to the next step.
No
Go to the next step.
13
VERIFY AFTER REPAIR PROCEDURE.
•  Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.