TEST 2: Making Sure The TPS Has Power And Ground
If in the previous test section your 2.4L Honda CR-V's throttle position sensor did not produce an increasing/decreasing voltage signal, then there's a good chance that it might be missing power or Ground.
So, we're gonna' make sure that the TP sensor is getting both by doing a simple multimeter voltage test on both circuits (wires).
The yellow with blue stripe (YEL/BLU) wire is one that TP sensor with power. This power is in the form of 5 Volt DC (which are provided by the fuel injection computer).
The green with yellow stripe (GRN/YEL) wire is one that feeds the TPS with Ground (this Ground comes from your CR-V's fuel injection computer too).
IMPORTANT: The fuel injection computer on your 2.4L Honda CR-V is the component that provides Ground to the throttle position sensor. Be careful to not short-circuit the Ground wire to battery voltage or you will fry the fuel injection computer. The multimeter voltage test indicated below is a safe way to test this Ground circuit.
Let's get started:
Check the YEL/BLU wire for power with the Key On Engine Off (KOEO) (see illustration above).
Back probe terminal number 1 with the red multimeter test lead and connect the black lead to the battery negative (-) post.
The multimeter should register 4.5 to 5 Volts DC.
Check the GRN/YEL wire for Ground with the Key On Engine Off (KOEO) (see illustration above).
Back probe terminal #3 with the black multimeter test lead and connect the red lead to the battery positive (+) post.
The multimeter should register battery voltage (12+ Volts).
CASE 1: Both Ground and power (5 Volts) are present. This is the correct and expected test result.
If you have confirmed that the YEL/BLU has 5 Volts DC and that the GRN/YEL wire is providing Ground, then with this test result you can conclude the TPS is defective.
CASE 2: Either Ground or power ARE NOT present. Without power or Ground the throttle position sensor will not produce a throttle angle voltage signal.
A lack of power or Ground is usually the result of a problem in the wiring between the TP sensor connector and the fuel injection computer connector. Although it's beyond the scope of this tutorial to further diagnose this wiring problem, your next step is to check the continuity of the power and Ground circuits between the TPS and the fuel injection computer.
More 2.4L Honda CR-V Tutorials
You can find a complete list of tutorials here: Honda 2.4L Index Of Articles.
Here's a sample of the tutorials you'll find there:
- How To Test For A Blown Head Gasket (2.4L Honda CR-V).
- How To Test The Ignition Coils (2002-2005 2.4L Honda CR-V).
- How To Test Engine Compression (2002-2009 2.4L Honda CR-V).
- How To Test The MAP Sensor (2002-2004 2.4L Honda CR-V).
If this info really saved the day, buy me a beer!