P0238

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The Accelerator Pedal Position (APP) module provides a voltage signal that changes relative to accelerator pedal position. There are three sensors located within the APP module that are scaled differently. This is a type D DTC.

CONDITIONS FOR SETTING THE DTC
- Boost Pressure greater than or equal 4.8 volts (202 kPa).
- Engine Speed less than 3506 RPM.

ACTION TAKEN WHEN THE DTC SETS
No turbo boost.

CONDITIONS FOR CLEARING THE MIL/DTC
- The Powertrain Control Module (PCM) will turn the MIL oft after three consecutive trips without a fault condition.
- A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (16O°F) that same ignition cycle.

DIAGNOSTIC AIDS
With the ignition ON and the engine stopped, boost pressure is approximately equal to Baro. Comparison of this reading with a known good vehicle using the same sensor is a good way to check accuracy of a suspect' sensor. Readings should be the same + 0.4 volt. Very little boost can be attained by revving the engine in neutral. A J 39200 can be used to measure (actual) signal voltage at the PCM harness connector.

TEST DESCRIPTION
Number(s) below refer to the Step number(s) on the Diagnostic Table.

2. This Step simulates conditions for a DTC P0237 If the PCM recognizes the change, the PCM and the signal circuit are OK.
3. Step will make sure the PCM is responding to a low signal voltage. This will indicate that the PCM is OK.