Pcm Code EO70, Intermittent TPS Signal: Action:

No code set. No service message.

This diagnostic test monitors MAP and TPS sensors. If MAP value remains constant and there is a large change in TPS value, code will set. Engine operation requires that any large change in TPS value must be followed by a change in MAP sensor value.

1. Code EO70 is not present at this time unless a Code 21, 22, 31 or 34 is current. This code indicates an unacceptable high rate of TPS change.
2. As the ISC extends, TPS voltage as measured at the TPS jumper should increase at a steady rate. A dead spot in the TPS will cause voltage to jump erratically as the ISC moves the TPS past that spot. Use a high impedance needle-type voltmeter this test.
3. If the throttle blade cannot return to the idle stop, the throttle valves may be coked or binding. These conditions may set Codes EO55 and EO58.
4. Improper TPS adjustment, such as forcing or tapping on the TPS without loosening the attaching screws, will damage the TPS and can cause Code EO70 to set.