DTC Advanced Diagnostics: P1658
DTC P1658:Electronic Throttle Control System (ETCS) Control Relay ON Malfunction (Engine Type: K24W1)

General Description

The electronic throttle control system controls the throttle valve opening. The system includes the throttle actuator, the throttle valve, throttle position (TP) sensors A and B, the electronic throttle control system (ETCS) control relay, the accelerator pedal position (APP) sensor, and the powertrain control module (PCM). When the accelerator pedal is pressed, the APP sensor detects the accelerator pedal opening value. The accelerator pedal opening value is converted to a signal in the APP sensor and transmitted to the PCM to compute the target position. The PCM determines the throttle valve target position according to the signal received and operates the throttle actuator to move the throttle valve to the target position. The actual throttle valve position is determined by TP sensors A and B (installed in the throttle body). When the voltage is applied from the ETCS control relay to the VBDBW terminal for a set time after the ETCS control relay is turned off, the PCM detects a malfunction in the ETCS control relay power switch and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Once per driving cycle
Sequence
None
Duration
2.0 seconds or more
DTC Type
One drive cycle, MIL on
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
 
Ignition switch*1
LOCK (0)
Engine start/stop button*2
OFF mode
No active DTCs set (prevents monitor from running)*3
P0122, P0123, P0222, P0223, P1659, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176
No active DTCs set (prevents monitor from running)*4
–
*1: Without keyless access system

*2: With keyless access system

*3: 2013, 2014 models

*4: 2015 model on and after

Malfunction Threshold
The communication signal is input from the PCM for at least 2.0 seconds after the ETCS control relay is turned off.

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.
ETCS control relay failure
ETCS control relay DBW RLY CL- line short to ground
PCM failure

Confirmation Procedure
Operating Condition
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

With the HDS
Do the ETCS TEST in the INSPECTION MENU with the HDS.

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 or by disconnecting the battery.