Signal Missing

Signal missing

Selecting engine control module (ECM)
The engine control module (ECM) must be selected in order to carry out the fault-tracing.
1. B5252FS or B5202FS
2. D5252T
3. Other engine control modules (ECM)

1 - B5202FS or B5252FS

2 - D5252T

3 - Other engine control modules (ECM)

-------------------------------------------------

B5202FS or B5252FS




- Ignition on.
- Read off engine coolant temperature (ECT).
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Hint: To obtain the engine temperature, read off engine coolant temperature (ECT) from the engine control module (ECM).





Is the temperature reading OK?

Yes - Intermittent fault

No - Checking connectors

-------------------------------------------------

D5252T




- Ignition on.
- Read off engine coolant temperature (ECT).
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Hint: To obtain the engine temperature, read off engine coolant temperature (ECT) from the engine control module (ECM).





Is the temperature reading OK?

Yes - Intermittent fault

No - Checking connectors

-------------------------------------------------

Other engine control modules (ECM)




- Ignition on.
- Read off engine coolant temperature (ECT).
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Hint: To obtain the engine temperature, read off engine coolant temperature (ECT) from the engine control module (ECM).





Is the temperature reading OK?

Yes - Intermittent fault

No - Checking connectors

-------------------------------------------------

Checking connectors








- Ignition off.
- Check and remedy the ECC control module and engine control module (ECM) connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Carefully check for any damage etc.
- To disconnect ECC control module, see Replacing ECC control module Removal and Replacement.
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Read off engine coolant temperature (ECT).
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Hint: To obtain the engine temperature, read off engine coolant temperature (ECT) from the engine control module (ECM).

If temperature is now OK this indicates that the fault was caused by poor contact in the connectors.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Checking cables

-------------------------------------------------

Checking connectors








- Ignition off.
- Check and remedy the ECC control module and engine control module (ECM) connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Carefully check for any damage etc.
- To disconnect ECC control module, see Replacing ECC control module Removal and Replacement.
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Read off engine coolant temperature (ECT).
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Hint: To obtain the engine temperature, read off engine coolant temperature (ECT) from the engine control module (ECM).

If temperature is now OK this indicates that the fault was caused by poor contact in the connectors.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Checking cables

-------------------------------------------------

Checking connectors








- Ignition off.
- Check and remedy the ECC control module and engine control module (ECM) connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Carefully check for any damage etc.
- To disconnect ECC control module, see Replacing ECC control module Removal and Replacement.
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Read off engine coolant temperature (ECT).
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Hint: To obtain the engine temperature, read off engine coolant temperature (ECT) from the engine control module (ECM).

If temperature is now OK this indicates that the fault was caused by poor contact in the connectors.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Checking cables

-------------------------------------------------

Checking cables
Check cable between ECC control module #B2 and engine control module (ECM) for an open-circuit 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 and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Also check cable between ECC control module #B2 and combined instrument panel combined instrument panel #A26 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- Connection of breakout box to ECC control module, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- The frequency on the coolant temperature signal varies with the temperature. For other values, see Signal specification ECC Signal Specification ECC.














Continue - Verification

-------------------------------------------------

Checking cables
Check cable between ECC control module #B2 and engine control module (ECM) for an open-circuit 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 and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Also check cable between ECC control module #B2 and combined instrument panel combined instrument panel #A26 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- Connection of breakout box to ECC control module, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- The frequency on the coolant temperature signal varies with the temperature. For other values, see Signal specification ECC Signal Specification ECC.














Continue - Verification

-------------------------------------------------

Checking cables
Check cable between ECC control module #B2 and engine control module (ECM) for an open-circuit 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 and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Also check cable between ECC control module #B2 and combined instrument panel combined instrument panel #A26 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- Connection of breakout box to ECC control module, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- The frequency on the coolant temperature signal varies with the temperature. For other values, see Signal specification ECC Signal Specification ECC.














Continue - Verification

-------------------------------------------------

Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Engine running.
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Fault-tracing information

-------------------------------------------------

Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Engine running.
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Fault-tracing information

-------------------------------------------------

Verification

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








- Ignition off.
- Reinstall connectors, components etc.
- Engine running.
Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature.





Is the temperature reading OK?

Yes - FAULT FOUND

No - Fault-tracing information

-------------------------------------------------

Intermittent fault
Check the ECC control module and engine control module (ECM) connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check cable between ECC control module #B2 and engine control module (ECM) for an intermittent open circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Also check cable between ECC control module #B2 and combined instrument panel #A26 for an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.

Other information:
- To disconnect ECC control module, refer to Replacing ECC control module Removal and Replacement.
- Connection of breakout box to ECC control module, refer to Connection of breakout box ECC Connection of Breakout Box ECC.
- The frequency on the coolant temperature signal varies with the temperature. For other values, see Signal specification ECC Signal Specification ECC.














Continue - Fault-tracing information

-------------------------------------------------

Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

------------------------

Attempt New Test - Selecting engine control module (ECM)

-------------------------------------------------

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

------------------------

Attempt New Test - Selecting engine control module (ECM)

FAULT-TRACING FAILED - No Fault Found

-------------------------------------------------