Electric throttle fault


Created: 25. 07. 2008
Updated: --. --. ----

Model:
Peugeot 307, EW10A Engine, MM6LPB Engine management.

Problem:
Intermittent, no throttle response, erratic idle, engine stalls.
Engine warning light on. Message on display, -Depollution system faulty-

Diagnosis
Fault codes logged in the engine ECU.
1. P1153 Throttle stop programming.
2. P1161 Throttle position check.
During the initial inspection of the relevant connectors
a liquid was discovered in the engine ECU. See images below.

Cause
Short circuit in throttle body wiring circuit due to:
Engine coolant entry to control unit connector 32 way gray. (32V GR)
Coolant originated from leaking coolant temperature sensor.

Image: Connector 32V GR on the right

Image: Coolant inside the ECU connector.

Image:
Schematic of coolant temp. sensor wiring.
The electric throttle body and the coolant temperature wiring
terminate both in the same ECU connector.

Solution:
Dry out the connector and ECU.
Replace the leaking coolant temperature sensor.

Fault codes. (DTC):
This is a list of other fault codes relating to the electric throttle housing.
P2100, P2101, P2102, P2103; Motorised throttle control.
P1157, P1158; Motorised throttle track 2.
P0122, P0113; Motorised throttle track 1


Technical information by
peugeotlogic.com