Installation manual

7-15

90-898305

HEAT TEST

With engine at idle, heat the TPS (with a hot air gun) below the electrical

connection until warm to the touch. Watch for any one or a combination of the

following symptoms:

• RPM change

• Check engine light illumination

• Momentary warning horn signal

• TPS voltage value change (1/2 volt) on DDT

NOTE: Excessive heat will damage TPS.

PRESSURE TEST

IMPORTANT: When testing TPS voltage, do not move the drive

mechanism (rotor/wiper).

1) Connect DDT and rotate the key to the “ON” position.

2) Set DDT to read TPS voltage; expand the screen to show Now/Min/Max.

NOTE: Test accuracy is improved when TPS is at its lowest voltage reading;

this may be idle or WOT depending on model year.

3) Clear the minimum/maximum values on the DDT - press the “0” button.

4) Watch the DDT reading while pressing below the electrical connection

point on the TPS cover.

a) Press on Cover Below Electrical Connection

5) Voltage reading should change:

• Less than a couple of digits (i.e. 1.90 v to 1.92 v)

NOTE: Version 5.0 cartridge gives 3 decimal point (millivolts) accuracy if

below 1 volt.

• Less than 10 millivolts (i.e. 0.293 v to 0.285 v)

• Replace any TPS that fails either test.

Notes

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