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Section 2: Troubleshooting DTCs
DTC P0122/P0123 Throttle Position Sensor (TPS)
Circuit Description
The TPS is a potentiometer connected to the
throttle shaft on the throttle body. The ECM
calculates throttle position by monitoring volt-
age on the signal circuit. As the throttle angle
changes, the TPS signal also changes. At a
closed throttle position, the voltage output of
the TPS is low, but as the throttle opens, the
voltage output increases.
BROWN
RED/WHITE
J2 10
5 Volt
Return
Reference
Signal Voltage Low, Open or High
2
TPS
1
3
PINK/BLACK
J2 16
J2 12
5 Volt
TPS
Sensor
Signal
Check for the following conditions:
1. Poor ECM connection. Inspect wire har-
ness connectors for backed out terminals,
improper mating, broken locks, improperly
formed or damaged terminals, and poor
terminal to wire connection.
2. Damaged wire harness and/or connec-
tors. If harness appears to be OK, shake or
wiggle wire harness and/or connector with
DVOM or ETA connected. Radical voltage
changes or a change in the TPS display
can indicate the location of the fault condi-
tion.
Always clear DTCs after performing repairs.
ECM
Diagnostic Aids
35
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