Member Since: 03 Feb 2019
Location: Toronto
Posts: 133
P0170-00 - Fuel trim (bank 1) (E8)
I got the above error code in IID and yellow CEL
I have also noticed my fuel useage is insane (25l/100km) I can almost watch the fuel gague falling as I drive
any advice on how to troubleshoot this please? recent work done has included new sparkplugs and 4 new O2 sensors. Plus tensioner and belts replaced
6th May 2023 3:11 pm
Endeavour
Member Since: 03 Feb 2019
Location: Toronto
Posts: 133
To answer my own problem:
Once the O2 sensors were replaced, I needed to use the IID tool to Clear Adaption Values under PCM
Usage
The clear adaption routine is necessary when, for example but not limited to, one of these components
is replaced:
• Idle speed control valve. Over a period of time, the engine ECU adapts the position it sets the
idle speed control valve relative to the engine temperature, load and idle speed control valve
itself.
• Throttle position sensor. The engine ECU “learns” the closed position voltage delivered by the
throttle position sensor.
• Heated oxygen sensors and airflow sensor. The engine ECU will monitor and compensate for
deterioration of the Oxygen, MAF (Mass Air Flow) and other sensors over a period of time. It will
also monitor the current correction associated with these sensors.
• Crankshaft position sensor. Due to small variations between different flywheels and different
sensors, the ECU performs an adaption of the crankshaft position sensor. This in turn allows for
misfire detection.
• Etc.
Now all my errors have cleared and my fuel "economy" has returned to normal
9th May 2023 12:11 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4518
Well done.
There weren't many answers to help you, but that reflects how few petrol Discoveries there are here against Diesel ones.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
9th May 2023 12:50 pm
z1234567890
Member Since: 30 Nov 2015
Location: Dubai
Posts: 165
Endeavour wrote:
To answer my own problem:
Once the O2 sensors were replaced, I needed to use the IID tool to Clear Adaption Values under PCM
Usage
The clear adaption routine is necessary when, for example but not limited to, one of these components
is replaced:
• Idle speed control valve. Over a period of time, the engine ECU adapts the position it sets the
idle speed control valve relative to the engine temperature, load and idle speed control valve
itself.
• Throttle position sensor. The engine ECU “learns” the closed position voltage delivered by the
throttle position sensor.
• Heated oxygen sensors and airflow sensor. The engine ECU will monitor and compensate for
deterioration of the Oxygen, MAF (Mass Air Flow) and other sensors over a period of time. It will
also monitor the current correction associated with these sensors.
• Crankshaft position sensor. Due to small variations between different flywheels and different
sensors, the ECU performs an adaption of the crankshaft position sensor. This in turn allows for
misfire detection.
• Etc.
Now all my errors have cleared and my fuel "economy" has returned to normal
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Well done.
