GLI L4-2.0L Turbo (BPY) (2008)
A/T Shift Indicator Module: Testing and Inspection
Selector Lever Sensor System Control Module CAN-Bus Terminal Resistance, Checking
Selector Lever Sensor System Control Module CAN-Bus Terminal Resistance, Checking
Special tools, testers and auxiliary items required
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Multimeter.
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Wiring diagram.
Test requirement
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A CAN-Bus malfunction was recognized.
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The Motronic Engine Control Module (ECM) J220 fuses OK.
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The Selector Lever Sensor System Control Module J587 fuses OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
Function
The Motronic Engine Control Module (ECM) J220 communicates with other CAN-Bus capable control modules.
The control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information
(messages). Missing information on the CAN-bus is recognized as a malfunction by the Motronic Engine Control Module (ECM) J220 and the other
control modules connected to the CAN-bus.
Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Motronic Engine
Control Module (ECM) J220.
Procedure
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Disconnect the Motronic Engine Control Module (ECM) J220 electrical harness connector.
NOTE: The Selector Lever Sensor System Control Module J587 must remain connected for the following step.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) J220 electrical harness connector terminals 67 to 68 for resistance.
Specified value: 60 to 72 Ohms (at approx. 20 degrees C)
If the specified value was not obtained:
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Check the Selector Lever Sensor System Control Module J587 electrical harness connector terminals 7 and 8 to the Motronic Engine Control
Module (ECM) J220 electrical harness connector terminals 67 to 68 for an open circuit, short circuit to Battery (+) or Ground (GND).
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Check the wiring connection for damage, corrosion, lose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) J220.
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Using a Multimeter, check the Selector Lever Sensor System Control Module J587 electrical harness connector to the Motronic Engine Control
Module (ECM) J220 electrical harness connector T94 for resistance.
Selector Lever Sensor System
Motronic Engine Control Module
Control Module J587 electrical
(ECM) J220 electrical connector
harness connector terminals
T94 terminals or test box sockets
8 (Can_Bus Low)
67
7 (Can_Bus High)
68
Specified value: 1.5 Ohms Max.