P1271
DTC P1271 APS 1 - 2 Correlation ErrorCircuit Description
- The accelerator position (AP) sensor circuit provides a voltage signal relative to accelerator pedal angle.
The accelerator pedal sensor (AP1) will vary from about 13 % at idle position to about 87 % at wide open throttle(WOT) to specified voltage (about 5 V).
This code detects a correlation error between APS1 and APS2.
Conditions for setting the DTC
- The Ignition is "ON".
- The accelerator pedal angle difference is more than 4.5 % between ASP1 and APS2 for more than 265 milliseconds.
Action Taken When the DTC Sets
- The PCM will not turn the malfunction indicator lamp (MIL) "ON".
- The PCM will store conditions which were present when the DTC was set as Failure Records only. This information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
- The PCM will turn the MIL "OFF" on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
- A history DTC P1271 will clear after 40 consecutive trip cycles during which the warm up cycles have occurred without a fault.
- DTC P1271 can be cleared using the Tech 2 "Clear Info" function or by disconnecting the PCM battery feed.
Diagnostic Aids
An intermittent may be caused by the following:
- Poor connections.
- Mis routed harness.
- Rubbed through wire insulation.
- Broken wire inside the insulation.
Check for the following conditions:
- Poor connection at PCM-Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
- Damaged harness-Inspect the wiring harness for damage. If the harness appears to be OK, observe the AP sensor 1, AP sensor 2 display on the Tech 2 while moving connectors and wiring harnesses related to the sensor.
A change in the display will indicate the location of the fault. If DTC P1271 cannot be duplicated, the information included in the Failure Records data can be useful in determined vehicle mileage since the DTC was last set.
If it is determined that the DTC occurs intermittently, performing the DTCP1271 Diagnostic Chart may isolate the cause of the fault.
Step 1 - 5:
Step 6 - 9:
DTC P1271 - APS 1 - 2 Correlation Error