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
Compare the engine control module (ECM) P/N visually with the replacement parts catalogue to determine if it is the correct control module for the engine type 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. Neither may it be disconnected while the engine cooling fan (FC) is still running. (If nothing else is indicated when replacing the relevant engine control module (ECM)).

Select Continue when the fault has been remedied.

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. Neither may it be disconnected while the engine cooling fan (FC) is still running. (If nothing else is indicated when replacing the relevant engine control module (ECM)).

- Disconnect immobilizer control module. Replacing immobilizer control module Replacing Immobilizer 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, Immobilizer Connecting the Breakout Box.
Engines with control module MSA 15.7; check the cable between breakout box terminal #50 (#4) and engine control module (ECM) #B36 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Engines with control module ME7, DENSO and MSA 15.8, check the cable between breakout box terminal #50 (#4) and engine control module (ECM) #B22 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.

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

Continue - Checking open-circuit/oxidation

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Checking open-circuit/oxidation
Engines with control module MSA 15.7; check the cable between breakout box terminal #50 (#4) and engine control module (ECM) #B36 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Engines with control module ME7, DENSO and MSA 15.8, check the cable between breakout box terminal #50(#4) and engine control module (ECM)) #B22 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
On engines with control module Fenix 5.2, check the cable between breakout box terminal #48(#2) and engine control module (ECM) #B5 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 remedied.

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.
Note! When the ignition has been switched on and off numerous times (within 30 seconds), certain engine control modules (ECM) transmit no new "question" (initiation signal). Wait 30 seconds with ignition off before switching the ignition on, if the ignition has been switched on and off in quick succession.

- Ignition on.
Read 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)
1. MSA 15.7 (engine D5252T) and Fenix 5.2 (engine types not listed below)
2. ME7, DENSO (engine type B5xx4T and B5xx4S) and MSA 15.8 (engine D5252T)

Which engine control module (ECM) is installed in the car?

1 - Checking communication with engine control module (ECM) MSA 15.7 and Fenix 5.2

2 - Checking communication with engine control module (ECM) ME7, DENSO and MSA 15.8

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Checking communication with engine control module (ECM) MSA 15.7 and Fenix 5.2

- Ignition on.
This can be done by reading the engine coolant temperature (ECT) for example.

- Ignition on.
This can be done by reading engine control module ID for example.

Does communication with the engine control module (ECM) function?

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 immobilizer control module Replacing Immobilizer Control Module.
Initiate the new immobilizer control module according to Initiate the immobilizer control module. Initiate the Immobilizer Control Module.

Select Continue when the fault has been remedied.

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. Neither may it be disconnected while the engine cooling fan (FC) is still running. (If nothing else is indicated when replacing the relevant engine control module (ECM)).

Replace control module according to:
- Engine B5xx4T according to Replacing the engine control module (ECM) Service and Repair.
- Engine B5xx4S.
- For other engines, the software is already in the control module when it is delivered.

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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Attempt New Test - Checking engine control module (ECM) type

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