P1122

TP Sensor CKT Intermittent Low Voltage:

TP System Performance:

Circuit Description

The Throttle Position (TP) sensor is potentiometer. A 5 volt reference is provided on CKT 605 and ground is provided on CKT 808. The TP sensor signal CKT 417 varies between ground and 5 volts based on the position of the throttle plates. At low throttle angle, the TP sensor signal voltage is low. The PCM uses TP sensor information to determine idle, Wide Open Throttle (WOT), deceleration enleanment and acceleration enrichment. DTC P1122 sets when the PCM detects a TP sensor signal that is 0.1 volts or less.

Conditions for Setting the DTC

Test Conditions

^ DTCs P0122 and P0123 not set.

^ 2 seconds have passed since key ON.

Failure Condition

Throttle position 0.1 volts or less.

Action Taken When the DTC Sets

^ The Malfunction Indicator Lamp (MIL) will not illuminate.

^ No message will be displayed.

Conditions for Clearing the DTC

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.

^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

^ PCM battery voltage is interrupted.

^ Using a Scan tool.

Diagnostic Aids

If fault is not present perform Powertrain Ground Check and also review Failure Record to determine conditions under which and how long ago the DTC set. Powertrain Ground Check

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. Checking if DTC P0120 is also set. If it is, go there first because it may help to pinpoint a faulty TP sensor.

5. Checking for an intermittent open or short to ground on the TP sensor 5 volt reference circuit or the TP sensor signal circuit that may be causing a low TP input.