Signal Missing

Signal missing

IMM-321 Initiating signal from engine control module (ECM)
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495
Checking engine control module (ECM) type
Check that the engine control module (ECM) P/N to determine that the correct control module for the engine type that is in the car.

Is it the correct engine control module (ECM)?

Yes - Checking for a short-circuit to supply voltage

No - Replacing component

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Replacing component
Install the new engine control module (ECM) with correct P/N.

Caution! The engine control module (ECM) must not be disconnected until at least 4 minutes after switching off the ignition and the engine cooling fan (FC) stopping.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Checking for a short-circuit to supply voltage

- Ignition off.
- Disconnect engine control module (ECM)

Caution! The engine control module (ECM) must not be disconnected until at least 4 minutes after switching off the ignition and the engine cooling fan (FC) stopping.

- Disconnect immobilizer control module. Replacing the control module Replacing the Control Module.
- Connect adapter box 981 3194 Replaced by 9511495 981 3194 Replaced by 951 1495 and breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 according to Connecting the breakout box Connecting the Breakout Box.
Check cable between breakout box terminal #50(#4) and engine control module (ECM) #B36 on engines with control module M4.4 and MSA 15.7 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between breakout box terminal #48(#2) and engine control module (ECM) #B5 on engines with control module Fenix 5.2 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Continue - Checking open-circuit/oxidation

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Checking open-circuit/oxidation
Check cable between breakout box terminal #50(#4) and engine control module (ECM) #B36 on engines with control module M4.4 and MSA 15.7 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between breakout box terminal #48(#2) and engine control module (ECM) #B5 on engines control module Fenix 5.2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check ground terminals and switches for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: For information about the terminals in the engine control module (ECM) see Wiring diagram.

Select "Continue" when the fault has been repaired.

Continue - Checking if the fault persists

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Checking if the fault persists

- Ignition off.
- Connect the engine control module (ECM).
- Connect the immobilizer control module.
- Ignition on.
Read diagnostic trouble codes (DTCs).

Is the diagnostic trouble code (DTC) still stored?

Yes - Select engine control module (ECM)

No - Verification

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Select engine control module (ECM)

What engine control module (ECM) is in the car?

1 - Checking communication with engine control module (ECM) Fenix 5.2

2 - Checking communication with Motronic 4.4 engine control module (ECM)

3 - Check communication with engine control module (ECM) MSA 15.7

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Checking communication with engine control module (ECM) Fenix 5.2

- Ignition on.
This can be done by reading the diagnostic trouble codes (DTCs).

Has communication with the engine control module (ECM) been established?

Yes - Replacing immobilizer control module

No - Replacing engine control module (ECM)

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Replacing immobilizer control module
Try a new immobilizer control module according to Replacing the control module Replacing the Control Module and initiate according to Initiating a new immobilizer control module Initiating A New Immobilizer Control Module.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Replacing engine control module (ECM)
Try a new engine control module (ECM).

Caution! The engine control module (ECM) must not be disconnected until at least 4 minutes after switching off the ignition and the engine cooling fan (FC) stopping.

Select "Continue" when the fault has been repaired.

Continue - Verification

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Verification

Verification

Hint: After finishing the repair check that the repair is successful and that the fault is corrected as follows.

Try to start the car.

Does the car start?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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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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