wheel torque MERCEDES-BENZ SPRINTER 2006 Repair Manual

TABLE OF CONTENTS - Continued
BACKUP LAMP CKT SHORT TO VOLTAGE OR OPEN........................15
BACKUP LAMP SUPPLY CIRCUIT OPEN...................................16
CAN BUS CIRCUIT......................................................17
INCORRECT CAN MESSAGE FROM ABS...................................18
INTERNAL CONTROLLER................................................19
LR WHEEL SPIN CAN MESSAGE NOT VALID...............................20
OVER VOLTAGE........................................................21
RR WHEEL SPIN CAN MESSAGE NOT VALID...............................22
UNDER VOLTAGE......................................................23
TRANSMISSION - NAG1
1-2/4-5 SOLENOID CIRCUIT..............................................24
1-2/4-5 SOLENOID CIRCUIT SHORT TO GROUND...........................24
2-3 SOLENOID CIRCUIT.................................................27
2-3 SOLENOID CIRCUIT SHORT TO GROUND..............................27
3-4 SOLENOID CIRCUIT.................................................30
3-4 SOLENOID CIRCUIT SHORT TO GROUND..............................30
ABS BRAKE MESSAGE..................................................33
ABS CAN MESSAGE INCORRECT.........................................35
ABS CAN MESSAGE MISSING............................................36
ABS LF SENSOR MESSAGE..............................................38
ABS LR SENSOR MESSAGE.............................................40
ABS RF SENSOR MESSAGE.............................................42
ABS RR SENSOR MESSAGE.............................................44
ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT.......................46
CAN BUS CIRCUIT......................................................48
CAN MESSAGE FROM ECM FROM SLA....................................53
CONTROL MODULE TCM IS NOT CODED..................................55
ENGINE CAN MESSAGE INCORRECT.....................................56
ENGINE CAN MESSAGE MISSING........................................58
ENGINE OVERSPEED...................................................60
ENGINE RPM MESSAGE.................................................62
ENGINE TEMP MESSAGE................................................64
ENGINE TORQUE MESSAGE INCORRECT.................................66
ENGINE TORQUE REDUCTION...........................................68
IC CAN MESSAGE INCORRECT..........................................70
IC/ATC CAN MESSAGE MISSING..........................................72
IMPROPER GEAR......................................................74
IMPROPER RATIO......................................................76
INPUT SENSOR MISMATCH..............................................78
INPUT SENSOR OVERSPEED............................................80
INTERNAL CONTROLLER................................................82
INVALID CONTROL MODULE VERSION....................................83
MODULATING PRESSURE SOLENOID CIRCUIT.............................84
N2 INPUT SPEED SENSOR CIRCUIT......................................87
N3 INPUT SPEED SENSOR CIRCUIT......................................91
SENSOR SUPPLY VOLTAGE..............................................95
SHIFT LEVER POSITION INVALID.........................................97
SHIFT PRESSURE SOLENOID CIRCUIT....................................99
SLA CAN MESSAGE INCORRECT........................................102
SOLENOID SUPPLY VOLTAGE...........................................103
SOLENOID SUPPLY/WATCHDOG.........................................105
SYSTEM OVERVOLTAGE...............................................107
ii

3-4 solenoid -The 3-4 solenoid is activated when
the TCM determines that the transmission must
shift into or out of 4th gear. The solenoid is only
activated during the shifting of the transmission.
When the solenoid is activated, hydraulic pressure
is applied to the proper shift elements in the trans-
mission to allow the desired shift. Once the shift is
completed, the solenoid is turned off.
TCC solenoid -The TCC solenoid is activated
when the TCM determines that the Torque con-
verter clutch should be activated. The TCC clutch is
a variable slip torque clutch that allows control of
torque converter slip from 5% to 95.5% of full TCC
engagement. The clutch is controlled by the TCC
solenoid which is pulse width modulated (PWM) to
provide the desired amount of slip.
Shift Pressure Solenoid -The Shift Pressure
Solenoid is activated when the TCM determines
that a transmission shift is required. The solenoid
is PWM controller to allow the proper amount of
hydraulic pressure to the shift elements. The sole-
noid is only activated during the shifting of the
transmission. When the solenoid is activated, hy-
draulic pressure is removed from the proper shift
elements to allow the desired shift. Once the shift is
completed, the solenoid is turned off.
Modulation pressure solenoid -The modulation
pressure is always active. The solenoid is pulse
width modulated (PWM) controlled and is used to
modulate the hydraulic system pressure to the
desired pressure.
3.2.4 TRANSMISSION COMPONENT
DESCRIPTIONS
Shift Assembly
The Shift Lever Selector transmits all selector lever
positions, as well as selected shift ranges to the
TCM over the CAN Bus. At the same time, the
selector lever positions P, R, N, and D are transmit-
ted by a cable to the selector lever shaft in the
transmission.
Brake shift inter-lock
To prevent unauthorized shifting out of the park
position, the Selector lever is locked in the Park
position until the ignition key is turned to the run
position and the brake pedal is pressed. This will
allow the driver to shift out of the park position.
Reverse Lamp Output
The Reverse Light Switch is integrated into the
shifter module and controls the reverse lights.
Reverse Inhibitor
The Shift Lever Assembly constantly monitors ABS
wheel speed to prevents an inadvertent selection of
reverse at speeds above approximately 6.4 Km/h(4MPH). The Reverse inhibitor is part of the Shift
Lever Assembly and is controlled by the Shift Lever
Assembly module.
Trans temp sensor - P/N Switch circuit
The TCM will detect the selector lever in park and
neutral positions. The TCM does this by monitoring
the Transmission temperature sensor signal along
with the shifter position signals. The P/N switch
contact is operated by a cam located in the trans-
mission which, opens a reed contact switch that is
wired in series with the transmission temperature
sensor. When the P/N contact switch is opened in
park and neutral, the TCM senses a high transmis-
sion temperature. Confirming the P/N switch sta-
tus. Note: In park or neutral, the TCM uses engine
temperature (to avoid setting a DTC). The TCM
sends a hardwired signal to the ECM that will allow
the ECM controlled start circuit to engage in P or N
only. The TCM also sends a P/N bus message to the
ECM to confirm the P/N switch status.
The Normal Transmission Temperature Sensor
resistance is between 500.0 and 2500.0 ohms.
The normal voltage limits for the transmis-
sion temperature sensor, are between 0.5 and
3.0 volts.
Input Speed Sensors
The NAG1 transmission has two input speed sen-
sors N2 and N3, both speed sensors are located on
the valve body and report DTC's for the input speed
sensors errors. The speed sensors are Hall Effect
speed sensors that are used by the TCM to calculate
the transmissions input speed. Since the input
speed could not be measured directly, two of the
drive elements are measured. Two input speed
sensors were required because both drive elements
are not active in all gears. The input sensors N2 and
N3 will report the same input speed in gears 2nd,
3rd or 4th. If the N2 and N3 input speed signals are
not the same in these gears then there is an issue
with the transmission and the DTC Input Sensors
Mismatch will be set.
The N3 input speed is not reported in1st and 5th
gears. The N2 sensor is not reported in Reverse.
The Input Speed Sensor Overspeed is a rationality
check that is intended to indicate a major transmis-
sion failure and will cause a loss of drive (place the
transmission in Neutral)
Output Speed Sensor (ABS signal)
The NAG1 transmission does not have an output
shaft speed sensor. The TCM uses the ABS (An-
tilock Brake System) Wheel Speed sensor informa-
tion, it receives over the CAN bus, to calculate the
transmissions output shaft speed. The TCM moni-
tors the ABS system for functionality and reports
ABS speed sensor and communication DTCs, which
will affect proper transmission operation.
3
GENERAL INFORMATION