Rick's Free Auto Repair Advice

Toyota P2118

Toyota P2118 trouble code

Shops are reporting a high incidence of Toyota P2118 trouble code conditions. The code is defined as P2118 Throttle Actuator Control Motor Current Range / Performance. The most common cause of this code is a blown ETCS fuse 10A in the underhood fuse box on the left side of the engine.  Start by checking the ECTS fuse. If it is blown, replace it.

What causes a Toyota P2118 trouble code

#1 Dead battery
#2 Cross polarity when jumping
#3 Failure to perform a throttle body relearn after disconnecting the battery

The Toyota Electronic Throttle Control System (ECTS) is an electronic throttle body that remains slightly open when the engine is off. When checking the condition of the ECTS with the engine off, you should see the throttle plate cracked open 5.5°. This is Toyota’s fail-safe mode.

During a fail-safe mode where the throttle body fails, the ECM stops feeding power to the ECTS and allows you to drive by controlling the fuel injector and spark timing to respond to your accelerator pedal inputs. This allows you to drive with a failed ECTS, although at minimal speed.

If you have a dead battery or have replaced the battery, you must perform an idle relearn. If you fail to do this, the throttle body may not operate properly.

Toyota Throttle Body Idle Relearn

Turn the ignition switch off and wait for at least 30 seconds.
Start the engine and warm it up until the engine coolant temperature is 80°C (176°F) or higher.
After the engine is warmed up, allow it to idle for 5 minutes with the air conditioning and all accessories off.
Confirm that the idle speed is within the standard range.

Other Toyota P2118 trouble code tests

Refer to the Toyota throttle body wiring diagram below. Confirm battery voltage at the throttle body connector M2. Confirm ground on throttle body connector M1. If you have both, disconnect the connector at the throttle body and check for resistance across M1 and M2. At room temperature, you should see 0.3-100Ω. If not, you may have a bad throttle body.

Toyota electronic throttle body wiring diagram

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Posted on by Rick Muscoplat

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