CS35 2013.04
3.1.13-137 3.1.13-137Electronic Control System - ME7
DTC P0121, P0122, P0123
1. DTC Description
2. Possible Sources
Fault Code Description Definition
P0121
Electrical throttle position sensor
signal 1 unreasonable
• ECM provides 5V reference voltage to terminal 3 of
TPS sensor wiring harness connector E23 through
terminal 32 of wiring harness connector E01.
• TPS provides sensor signal voltage to terminal 54
of ECM wiring harness connector E01 through ter-
minal 6 of wiring harness connector E23.
• ECM positions terminal 2 of TPS sensor wiring har-
ness connector E23 at low electrical potential
through terminal 78 of wiring harness connector
E01.
P0122
Electrical throttle position sensor
signal 1 circuit voltage too low
P0123
Electrical throttle position sensor
signal 1 circuit voltage too high
Fault
Code
Test Tactics
Setting Conditions (Control
Strategy)
Fault
P0121
Throttle position
sensor 1 and the
throttle position
sensor 2 is incon-
sistent, more than
the specified value,
or throttle position
sensor 1 and the
expected value is
inconsistent, more
than the specified
value.
Turn ignition switch to position "ON",
and engine is off or is running.
• Sensor circuit fault
• Sensor fault
• ECM fault
P0122
Signal circuit volt-
age too low, short
circuit to ground
P0123
Signal circuit volt-
age too high, short
circuit to power
supply
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