key MERCEDES-BENZ SPRINTER 2006 Service Manual

Symptom:
ABS CAN MESSAGE MISSING
When Monitored and Set Condition:
ABS CAN MESSAGE MISSING
When Monitored: CAN Bus Circuit error not present, 1 second after ignition on and not
in Park or Neutral, no System Overvoltage or System Undervoltage conditions present, or
transmission in Park or Neutral and engine RPM greater than 850 RPM
Set Condition: This DTC is set when a CAN ID was not received in the required time are
not being sent from the ABS Controller. NOTE: The ABS controller is powered by the run
only ignition feed. This means that this DTC will be set if the key is placed in the start
position with the transmission in gear or if in Park or Neutral and the engine RPM is
greater than 850 RPM.
POSSIBLE CAUSES
CAN BUS CIRCUIT DTC PRESENT
CAN BUS +/- CIRCUIT OPEN
ABS DTCS PRESENT
ABS - CAN MESSAGE MISSING
TCM - CAN MESSAGE MISSING
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the service information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTCs. Check and repair all engine DTCs prior to
performing transmission symptom diagnostics.
With the DRBIIIt, read and record all Transmission DTCs.
NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal
connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Most DTCs set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for any Technical Service Bulletins that may apply.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
36
TRANSMISSION - NAG1

Symptom:
CAN BUS CIRCUIT
When Monitored and Set Condition:
CAN BUS CIRCUIT
When Monitored: Always monitored with system active at each ignition cycle.
Set Condition: Open circuit in the CAN C Bus (+) circuit or CAN C Bus (-) circuit, Short
to ground of CAN C Bus (+) circuit or CAN C Bus (-) circuit, Short to Voltage of CAN C Bus
(+) circuit or CAN C Bus (-) circuit, CAN C Bus (+) circuit shorted to CAN C Bus (-) circuit,
or a TCM failure. Note: All CAN message missing DTCS will also be present, which
indicates a Bus Failure.
POSSIBLE CAUSES
CAN BUS CIRCUITS OPEN TO SKREEM OR ECM
CAN BUS CIRCUITS OPEN TO TCM
CAN CIRCUITS SHORTED TO GROUND
CAN CIRCUIT SHORT TO VOLTAGE
CAN CIRCUITS SHORTED TOGETHER
MODULE SHORT INTERNALLY
MODULE SHORT TO GROUND
MODULE SHORT TO VOLTAGE
ECM - TERMINATING RESISTOR
SENTRY KEY REMOTE ENTRY MODULE
TRANSMISSION CONTROL MODULE
48
TRANSMISSION - NAG1

TEST ACTION APPLICABILITY
10 Turn the ignition off to the lock position.
Disconnect the ECM harness connector.
Measure the resistance between the CAN C Bus (+) and CAN C Bus (-) circuits in the
ECM harness connector.
Is the resistance 120.0 ohms   5.0 ohms?All
Ye s!Replace the ECM per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 11
11 Turn the ignition off to the lock position.
Reconnect the ECM harness connectors.
Disconnect the SKREEM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the SKREEM harness connector.
Is the resistance 120.0 ohms   5.0 ohms?All
Ye s!Replace the Sentry Key Remote Entry Module per the Service
Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Repair the CAN C Bus (+) and/or CAN C Bus (-) circuit for an
open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
12 Turn the ignition off to the lock position.
Disconnect the negative battery cable.
Disconnect the TCM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit at the TCM harness connector.
Is the resistance 60.0 ohms   5.0 ohms?All
Ye s!Replace the Transmission Control Module per the Service Infor-
mation.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Repair the CAN C Bus (+) and/or CAN C Bus (-) circuit for an
open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
52
TRANSMISSION - NAG1
CAN BUS CIRCUIT ÐContinued