Description

Short circuit or low-resistance connection to supply voltage at operating coil.

Effects on the driving operation

Depending on where the fault is located in the operating coil circuit, the vehicle will respond as follows:

Driving is not possible.

No retarder operation

Driving in reverse gear is restricted.

Possible causes

Short-circuit in plug connection or cabling.

Connection of the solenoid valve

Connector pin assignment of 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

Pin assignment of 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 solenoid valve

Place of action

WP solenoid valve

Cabling between solenoid valve WP and transmission control unit

Instruction

Check plug connections and cabling.

Setting conditions of the event

No description available.

Test conditions of the event

No description available.

Connector switched solenoid valve

Troubleshooting

1. Check plug connections and cables.
2. Pull connector at solenoid.
   Check that solenoid is internally intact:
   When measuring the coil resistance, please observe the dependence on the temperature.
   Simultaneously to the resistance measurement, the temperature of the solenoid housing has to be measured also or estimated with utmost accuracy. Read the nominal resistance indicated in the temperature curve below and compare it to the measured or estimated temperature.
   Operating coil
   Measure the resistance between pin 4 and pin 2.
   The operating coil works correctly if the measured resistance deviates from the nominal resistance by not more than ± 1 Ω.
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