Abs Return Flow Pump Runs Without Control (LI42.30-P-045530)

Publication date: 2009-01-16
Reference number: LI42.30-P-045530
Supersedes refnos: 42.30/103

ABS RETURN FLOW PUMP RUNS WITHOUT CONTROL

TECHNICAL SERVICE BULLETIN

Reference Number(s): LI42.30-P-045530 Version 1 (P-B-42.30/103, January 13, 2009), Date of Issue: January 16, 2009

Mercedes-Benz:	All Model 202 Vehicles, Equipped with Anti-lock Brake System (ABS) (Code 470a); All Model 208 Vehicles, Equipped with Anti-lock Brake System (ABS) (Code 470a)
Design Group:	42.30 Anti-lock brake system (ABS)
Reason For Change:

COMPLAINT

Anti-Lock Brake System (ABS) return flow pump running without control with corresponding fault code C1401

CAUSE

N/A

REMEDY

Clean and insulate the connector for the return flow pump relay. Refer to WIS document GF42.30-P-0003-09B.

NOTE: Due to standardization of the ABS wire harness for both the Bosch and ITT systems, the plug for the return flow pump is not assigned on ITT systems. As such, oxidation can occur within the plug causing the return flow pump in the ABS hydraulic unit to start.

SYMPTOMS

Brakes/traction regulation system / Antilock Brake System ABS / Function / Does not control / Chassis/suspension / Brake system /

CONTROL UNIT/FAULT CODE

Control unit	Fault code	Fault text
ABS-Antilock brake system (ABS30_H)	C1401	A7/3m1 (High pressure and return pump)

WIS-REFERENCES

Document number	Title	Note	Allocation
GF42.30-P-0003-09B	Anti-lock brake system (ABS), location of electrical/ electronic components		Remedy