Checking Solar Sensor (ECC)

Checking solar sensor (ECC)

Checking sun sensor signal




- Ignition on
- Go into scrolling values.
- Read off sun sensor signal.
Mask the sun sensor, and read the value. Remove masking and aim a strong light source at close range at the sun sensor.

Note! The value from the sun sensor is updated slowly, so keep the masking / light source in place for approximately 20 seconds.

Check that the value changes.









Does the sun sensor value change?

Yes - No Fault Found

No - Checking cables

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Checking cables
Check the ECC control module and sun sensor connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check ground lead between ECC control module #B10 and sun sensor terminal 4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Check signal cable between ECC control module #B9 and sun sensor terminal 2 for an open circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If cables are OK, try a new sun sensor.
Remedy as necessary

Other information:
- To access/replace the sun sensor, refer to Replacing sun sensor (ECC) Removal and Replacement.
- To remove the control module, refer to Replacing ECC control module Removal and Replacement.
- To connect the breakout box, see Connection of breakout box ECC Connection of Breakout Box ECC.














Continue - Verification
FAULT FOUND

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
- Read off sun sensor signal.
Mask the sun sensor, and read the value. Remove masking and aim a strong light source at close range at the sun sensor.

Note! The value from the sun sensor is updated slowly, so keep the masking / light source in place for approximately 20 seconds.

Check that the value changes.





Does the sun sensor value change?

Yes - FAULT FOUND

No - Fault-tracing information
No Fault Found

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking sun sensor signal

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