DTC C1277

id010200003100

DTC C1277

Steering angle sensor circuit malfunction

DETECTION CONDITION

• The PCM monitors input voltage from the steering angle sensor. If the input voltage at PCM terminal 1M or 1R is 4.9 V or more or 0.1 V or less, the PCM determines that the steering angle sensor circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
• PENDING CODE is available if the PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Steering angle sensor malfunction
• Poor connection at connectors (female terminal)
• Improper installation or positioning of the steering angle sensor
• Open circuit in the wiring harness between steering angle sensor terminal A and ignition switch
• Open circuit in the wiring harness between steering angle sensor terminal B and PCM terminal 1M, short to power or to ground
• Open circuit in the wiring harness between steering angle sensor terminal D and PCM terminal 1R, short to power or to ground
• Open circuit in the wiring harness between steering angle sensor terminal C and body ground.
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PRODESERE
• Perform DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Go to INTERMITTENT CONCERN TROUBLESHOOTING procedures.
2
INSPECT STEERING ANGLE SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the steering angle sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 11.
No
Go to the next step.
3
INSPECT STEERING ANGLE SENSOR POWER SUPPLY FOR OPEN CIRCUIT
• Turn the ignition switch to the ON position. (Engine off)
• Measure the voltage between the steering angle sensor terminal A and body ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the harness for open circuit between steering angle sensor terminal A and ignition switch, then go to Step 11.
4
INSPECT STEERING ANGLE SENSOR GROUND FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the steering angle sensor terminal C and body ground.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the harness for open circuit between steering angle sensor terminal C and body ground, then go to Step 11.
5
INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to the ON position. (Engine off)
• Measure the voltage between the following steering angle sensor connector terminals (vehicle harness-side) and body ground:
- Steering angle sensor (Sensor 1): B and body GND
- Steering angle sensor (Sensor 2): D and body GND
• Is the voltage B+?
Yes
Repair or replace wiring harness for short to power, then go to Step 11.
No
Go to the next step.
6
INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR SHORT TO GND
• Turn the ignition switch off.
• Turn the ignition switch off.
• Inspect for continuity between the following steering angle sensor terminals (vehicle harness-side) and body ground:
- Steering angle sensor (Sensor 1): B and body GND
- Steering angle sensor (Sensor 2): D and body GND
• Is there continuity?
Yes
Repair or replace wiring harness for short to GND, then go to Step 11.
No
Go to the next step.
7
INSPECT FOR IMPROPER INSTALLATION OF STEERING ANGLE SENSOR
• Is the installation normal?
Yes
Go to the next step.
No
Repair or replace the steering angle sensor, then go to the Step 11.
8
INSPECT STEERING ANGLE SENSOR
• Inspect the steering angle sensor.
• Is there any malfunction?
Yes
Replace the steering angle sensor, then go to Step 11.
No
Go to the next step.
9
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 11.
No
Go to the next step.
10
INSPECT STEERING ANGLE SENSOR CIRCUIT FOR OPEN CIRCUIT
• Disconnect the PCM connectors.
• Inspect for continuity between PCM terminals (vehicle harness-side) and body ground:
- Steering angle sensor (Sensor 1): 1M-B
- Steering angle sensor (Sensor 2): 1R-D
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to the next step.
11
VERIFY TROUBLESHOOTING OF DTC C1277 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Start the engine.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
12
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.