P070

Circuit Description

This diagnostic test monitors Manifold Absolute Pressure (MAP) and Throttle Position (TP) sensors. Engine operation requires that any large change in throttle angle (TP) sensor must be followed by a change in manifold pressure (MAP). If the MAP remains constant and there is a large change in TP sensor, PCM Code P070 will set.

Test Condition(s)

1. Codes P031, P032 and P034 not set.
2. Throttle angle changes more than 5 degrees in 12.5 milliseconds (0.0125 second).
3. MAP greater than 22 kPa.
4. MAP not within 12 kPa of atmospheric pressure (BARO).
5. Engine running.
6. Low coolant level and engine overheat not present.
7. Traction control not active.
8. Key 'ON' for at least 2 seconds.

Failure Condition(s)

MAP change of 3 kPa or less in 0.21 second following a 5 degree or greater change in throttle angle.

Action Taken

None.

Notes on Fault Tree

1. Checking Code P070 snapshot value is used to determine if an intermittent low voltage or an intermittent high voltage caused the code to set. An intermittent low voltage can be caused by an open or short to ground on CKT 417 or by an open in CKT 474 or the TP sensor itself. An intermittent high voltage can be caused by an open in CKT 476 or a short to voltage on CKT 417.