7A1–100 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 37
TORQUE MANAGEMENT SERIAL LINE FAULTY
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP MODE.
Circuit Description:
•
Torque Management is a function that decreases
the engine torque during transmission shifts. To
do so the Transmission Control Module (TCM)
exchanges information on a wire with the Engine
Control Module (ECM) that governs the Engine.
This wire is the Data Link Connector which is also
used by the Scan tool to communicate with the
TCM and the ECM.
Diagnostic Aids:
•
This Diagnostic is not an electrical test done by
the TCM but a test between different information
(“logic test”).
•
Detection conditions:
1 Torque control failure detected
2 Each time a shift occurs with the Torque
Management active, the TCM sends a
message to the ECM. If the ECM does not
acknowledge this message, the DTC is stored.
•
Action after the detection time: BACKUP MODE
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
NOTE:
1
When connecting the TECH2 to the data link
connector, be sure to turn off the ignition
switch.
2
Since the torque management exchanges
information between the TCM and the ECM at
all times, the DTC37 is sometimes detects in
the following condition.
However, this is not an abnormal condition.
•
When the engine stops while driving and
then it is restarted.
•
When the battery voltage goes down
excessively and the engine does not start
again.
When DTC37 is detected in the above
conditions, turn off the ignition switch, correct
the abnormal condition and erase the trouble
code.
SERIAL DATA
TRANSMISSION
CONTROL
MODULE (TCM)
ENGINE
CONTROL
MODULE
(ECM)
C-95
C8(8)
E-61
35
C2
YEL
YEL
YEL
C-102
C-102
C-102
C-102
9
11
16
4
DATA LINK
CONNECTOR
BLK
YEL/BLK
GRN
FUSE (EB-12)
D16(32)
DIAGNOSIS
INPUT
C-102
5
D07LW017