Description

Short-circuit or low-resistance connection to supply voltage at the positive sensor terminal.

Effects on the driving operation

Unable to detect temperature, possible consequences:

Hard shifts with transmission oil cold.

The temperature-related deactivation of the retarder is restricted.

Possible causes

Short-circuit in connector, cabling or sensor.

Connection of the temperature sensor

Connector pin assignment of the transmission control unit

Pin	Stecker A	Stecker B	Stecker C	Stecker D
1	SHIELD	EK	FLEXI-1	-BATT
2	TIM+	DK	---	IGN
3	TIM-	SK	FLEXI-3	FLEXI-11
4	N1+	RBK	FLEXI-4	K-LINE
5	N1-	TB	FLEXI-5	CAN1-H
6	N2+	---	FLEXI-6	CAN1-H
7	N2-	RBG	FLEXI-7	CAN-SHLD
8	N3+	PB	FLEXI-8	CAN1-L
9	N3-	WR	FLEXI-9	CAN1-L
10	---	WP	FLEXI-10	CAN2-H
11	---	---	FLEXO-2H	CAN2-H
12	EKM	FLEXI-12	FLEXO-4H	CAN2-L
13	DKM	S-GND	FLEXO-3H	CAN2-L
14	SKM	OIL-LVL	FLEXO-5L	CAN1-R
15	PBM	T-SUMP	---	---
16	TBM	---	---	FLEXO-1L
17	RBKM	T-CONV	---	CAN2-R
18	MVM-GND	MV-GND	---	+BATT

Connector pin assignment of the transmission connector

Pin	Name	Pin	Name	Pin	Name
1	S-GND	14	RBK	27	EKM
2	MV-GND	15	RBG	28	PBM
3	MV-GND	16	TB	29	RBKM
4	---	17	WR	30	TBM
5	T-CONV	18	---	31	MVM-GND
6	T-SUMP	19	---	32	N1+
7	OIL-LVL	20	---	33	N1-
8	P-DIFF	21	TIM-	34	N2+
9	SK	22	TIM+	35	N2-
10	DK	23	---	36	N3+
11	EK	24	SHIELD	37	N3-
12	PB	25	SKM
13	WP	26	DKM

Internal cable harness

Installation point of the temperature sensor

Location

Engine speed sensor

(negative terminal of sensor or sensor circuit)

Instruction

Check plug-in contacts, cabling and sensor.

Setting conditions for the event

No description available.

Test conditions for the event

No description available.

Temperature sensor connector T-SUMP E300.1

Troubleshooting

1. Check plug connections and cables.
   (Instruction: see "Related Topics")
2. Disconnect the plug connection at the temperature sensor.
   Check that the sensor is internally intact:
   When measuring the resistance, please observe the dependence on the temperature.
   Simultaneously to the resistance measurement, the sensor temperature has to be measured, too, or estimated with utmost accuracy. Compare the nominal resistance as indicated in the temperature curve below and compare it to the measured or estimated temperature.
   Measure the resistance between pin 1 and pin2 (bottom).
   The sensor works correctly if the measured resistance deviates from the nominal resistance by not more than ± 50 ohms.
   No resistance – no connection – must be measurable between the pins and the sensor housing; the resistance is infinitely large.
3. Replace the control unit.
4. If none of the above measures brings any improvement, please contact the Voith Turbo headquarters.

Characteristic

Final function check

If the defective component cannot be clearly identified, you should try to reproduce the fault:

• Reinstall the component in the vehicle.
• Test the function.

After the fault has been eliminated, the following steps have to be carried out:

• Conduct a test drive with function check.
• Read out the fault memory.
• Check the transmission for leaks.
• Perform a final visual inspection.

These steps are necessary to ensure the entire vehicle functions.

See also:

		Troubleshooting for short-circuit to 24 V
		Aftersales service index