DTC Advanced Diagnostics: P1684
DTC P1684:Throttle Valve Return Spring Performance Problem

General Description

The powertrain control module (PCM) monitors the electronic throttle control system for functionality failures. The return motion forced by the return spring is checked. If the actual position exceeds a specified value, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
None
Duration
0.36 second or more
DTC Type
One drive cycle, MIL on

Enable Conditions
Condition
Minimum
Maximum
Engine coolant temperature [ECT Sensor 1]
41.47 °F (5.26 °C)
212.82 °F (100.46 °C)
Intake air temperature [IAT Sensor (1)]
41.47 °F (5.26 °C)
289.86 °F (143.26 °C)
Engine speed [Engine Speed]
–
250 rpm
Vehicle speed [Vehicle Speed]
–
0.6 mph (1 km/h)
12 volt battery voltage [Battery]
10.5 V
16.5 V
[ ]: HDS Parameter

Malfunction Threshold
Either of the conditions is met:
First learning performed
The throttle valve position is more than 18.9275 %.
First learning not performed
The throttle valve position is more than 15.9375 %.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Throttle body failure

Confirmation Procedure
Operating Condition
1.
Start the engine. Hold the engine speed [ENGINE SPEED] at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.
2.
Turn the vehicle to the OFF (LOCK) mode, and wait 30 seconds.
3.
Turn the vehicle to the ON mode.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.