Mercedes-Benz Sprinter / Dodge Sprinter. Service manual — part 560

Symptom:

TRANS TEMP SENSOR SHORTED

When Monitored and Set Condition:

TRANS TEMP SENSOR SHORTED

When Monitored:

Always monitored with system active

Set Condition:

Temperature sensor input below a threshold, failed temperature sensor,

short to ground, TCM

POSSIBLE CAUSES

TEMP SENSOR - P/N SWITCH CIRCUIT SHORT TO GROUND

TEMP SENSOR - P/N SWITCH CIRCUIT SHORT TO OTHER CIRCUITS

TCM - P/N SWITCH CIRCUIT

TRANSMISSION TEMPERATURE SENSOR

TCM - TRANS TEMP SENSOR SHORTED

TRANSMISSION TEMP SENSOR - P/N SWITCH

TEST

ACTION

APPLICABILITY

1

NOTE: 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 DRBIII

t, read the engine DTCs. Check and repair all engine DTCs prior to

performing transmission symptom diagnostics.
With the DRBIII

t, 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

2

Attempt to start the vehicle in Park and Neutral.
Does the engine start in either position, Park or Neutral?

All

Yes

→ Go To 3

No

→ Go To 5

122

TRANSMISSION - NAG1

TEST

ACTION

APPLICABILITY

3

Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Place the gear selector to Drive (D).
Measure the resistance of the Transmission Temperature Sensor between the Temp
Sensor - P/N Switch circuit and the Sensor Ground circuit in the TCM C2 harness
connector.
Is the resistance between 500 ohms and 2500 ohms.

All

Yes

→ Go To 4

No

→ Check for a poor terminal to pin connections at the Solenoid

Assembly harness connector and repair as necessary. If no prob-
lems are found in the connector, replace the Transmission Tem-
perature Sensor - P/N Switch Assembly per the Service Informa-
tion.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

4

If there are no possible causes remaining, view repair.

All

Repair

Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

5

Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid harness connector.
NOTE: This procedure may set several DTCs in both the ECM and TCM.
Disregard and erase DTCs after this procedure.
With the gear selector in park, attempt to start the vehicle.
Does the vehicle start?

All

Yes

→ Replace the Transmission Temperature Sensor - P/N Switch

Assembly per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 6

6

Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.
Measure the resistance between ground and the Temp Sensor - P/N Switch circuit.
Is the resistance below 5.0 ohms?

All

Yes

→ Repair the Temp Sensor - P/N Switch circuit for a short to ground.

Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 7

7

Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Disconnect the TCM C1 and C2 harness connectors.
Measure the resistance of the Temp Sensor - P/N Switch circuit to all other circuits
in the TCM C1 and C2 harness connectors.
Is the resistance below 5.0 ohms between any other circuit?

All

Yes

→ Repair the Temp Sensor - P/N Switch circuit for a short to other

circuits.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 8

123

TRANSMISSION - NAG1

TRANS TEMP SENSOR SHORTED —

Continued

TEST

ACTION

APPLICABILITY

8

If there are no possible causes remaining, view repair.

All

Repair

Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

124

TRANSMISSION - NAG1

TRANS TEMP SENSOR SHORTED —

Continued

Symptom:

TRANSMISSION SLIPPING

When Monitored and Set Condition:

TRANSMISSION SLIPPING

When Monitored:

Engine rpm greater than 450 rpm, output speed greater than 180 rpm,

no N2 - N3 input speed sensor errors present, no gear selector lever errors present, no ABS
system errors, no transfer case errors present, and all wheel speeds between 70 - 380 rpm
with no wheel slip detected. Set Condition: Calculated ratio not within allowable range for
the engaged gear. No shifting operation.

Set Condition:

The TCM constantly calculates the transmission ratio based on the N2 -

N3 input speed signals and the calculated output shaft speed (CAN message from the
ABS). The TCM will detect if the transmission is slipping or an invalid gear ratio is present

POSSIBLE CAUSES

OTHER DTCS PRESENT

AXLE - MECHANICAL - GEAR RATIO

INTERNAL TRANSMISSION

TCM - TRANSMISSION SLIPPING

TEST

ACTION

APPLICABILITY

1

NOTE: 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 DRBIII

t, read the engine DTCs. Check and repair all engine DTCs prior to

performing transmission symptom diagnostics.
With the DRBIII

t, 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

125

TRANSMISSION - NAG1