These two codes are pointing at your TPS.
Your car may have a rough or high idle, or it could be surging or stumbling when accelerating and decelerating
The causes could be any of the following:
Your TPS may not be secured properly
You could have a short in the wiring to your TPS
The connectors to your TPS may be loose
Your TPS may be bad
P0121 (M) - Accelerator Position Sensor (APPS)
APPS voltage input below the minimum acceptable voltage.
P0123 (M) - Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Throttle position sensor input above the
maximum acceptable voltage. Follow all appropriate diagnostics for the
fault that is present. Prior to replacing parts, check all connectors
between the speed control switch and the PCM for moisture Internally
the PCM uses the same A/D (analog to digital) converter for TPS voltage
as it does for the speed control switch sense. If the v-37 circuit has
voltage bleed over from another source, a code of TPS Shorted to
voltage may be set in the PCM. The DN model equipped with rear heat
option, has an external water pump to circulate coolant to the rear
heater. If you find coolant in the bulkhead connector, the likely cause
would be a leaking coolant pump. Pump should be replaced if found
leaking. If the code sets when the A/C is turned on go right to the
bulk head connector and check for moisture. Check for a shorted clock
spring causing the speed control 5 volt feed to be shorted to power.
Here can find more details about OBD (On-Board Diagnostic) systems.
I hope help you. Good luck (remember rated this help).
Codes relate to improper voltages at throttle position sensor and map sensor. Do tests outlined in haynes or chiltons with a digital volt/ohmeter and compare what you have to readings in book. Both are information sensors and show common wiring.
Trouble Code: P0113
IAT Sensor Circuit High Input
Possible Causes:
IAT Sensor signal circuit shorted to VREF (5v)
IAT Sensor signal circuit is open, or the ground circuit is open
Trouble Code: P0123
TP Sensor/APPS Circuit High Input
Possible Causes:
Related TP Sensor engine DTCs present
Intermittent wiring or connector problem
TP signal circuit is open or is shorted to battery voltage or to 5v supply circuit
TP sensor has failed
TP sensor ground circuit is open
PCM has failed IAT Sensor is damaged or it has failed (an internal open circuit)
PCM has failed
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