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

BHE040243000W27

DTC

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

Combined sensor

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 DSC HU/CM terminal A and combined sensor terminal A or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal D and combined sensor terminal C or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal F and combined sensor terminal B or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal G and combined sensor terminal D or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal L and combined sensor terminal E or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal P and combined sensor terminal F
• 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 4.5-5.5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between combined sensor terminal E and DSC HU/CM terminal L, 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 P (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 P 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 F (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 F 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 F (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal F 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 G (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 G 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 G (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal G 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 A (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 A 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 A (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal A 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 D (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 D 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 D (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between DSC HU/CM terminal D 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.
(See DTC Table.)
No
DTC troubleshooting completed.