DTC P0121:00 [SKYACTIV-D 2.2]

id0102s4146900

DTC P0121:00

APP sensor No.1/No.2 correlation problem

DETECTION CONDITION

•  With the following conditions met, the output voltage of APP sensors No.1 and No.2 is compared, and the difference in the voltage is 0.7 V or more for a continuous 1 s:

MONITORING CONDITIONS

―  Battery voltage: 8—20 V

―  Ignition switched ON (engine off or on)

―  The following DTCs are not detected:

•  APP sensor No.1: P2122:00, P2123:00

•  APP sensor No.2: P2127:00, P2128:00

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  PCM restricts engine torque.

•  Regulates the upper limit of the APP sensor output.

•  Inhibits the EGR control.

•  Inhibits the diesel particulate filter regeneration control.

•  The fast idle up correction for the idle speed control is inhibited.

•  Inhibits engine-stop by operating the i-stop function.

POSSIBLE CAUSE

•  APP sensor connector or terminals malfunction

•  PCM connector or terminals malfunction

•  APP sensor No.1 signal circuit and APP sensor No.2 signal circuit are shorted to each other

•  APP sensor No.1 malfunction

•  APP sensor No.2 malfunction

•  PCM malfunction

DTC P0121:00	APP sensor No.1/No.2 correlation problem
DETECTION CONDITION	• With the following conditions met, the output voltage of APP sensors No.1 and No.2 is compared, and the difference in the voltage is 0.7 V or more for a continuous 1 s: MONITORING CONDITIONS ― Battery voltage: 8—20 V ― Ignition switched ON (engine off or on) ― The following DTCs are not detected: • APP sensor No.1: P2122:00, P2123:00 • APP sensor No.2: P2127:00, P2128:00 Diagnostic support note • This is a continuous monitor (CCM). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• PCM restricts engine torque. • Regulates the upper limit of the APP sensor output. • Inhibits the EGR control. • Inhibits the diesel particulate filter regeneration control. • The fast idle up correction for the idle speed control is inhibited. • Inhibits engine-stop by operating the i-stop function.
POSSIBLE CAUSE	• APP sensor connector or terminals malfunction • PCM connector or terminals malfunction • APP sensor No.1 signal circuit and APP sensor No.2 signal circuit are shorted to each other • APP sensor No.1 malfunction • APP sensor No.2 malfunction • PCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) • Perform the Freeze Frame PID Data Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the DTC P0121:00 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
1		No	Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE [SKYACTIV-D 2.2].)
2	VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
2		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
3	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
3		No	Go to the next step.
4	VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the PENDING CODE/DTC P0122:00, P0123:00, P0222:00 or P0223:00 also present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC P0122:00 [SKYACTIV-D 2.2].) (See DTC P0123:00 [SKYACTIV-D 2.2].) (See DTC P0222:00 [SKYACTIV-D 2.2].) (See DTC P0223:00 [SKYACTIV-D 2.2].)
4		No	Go to the next step.
5	INSPECT APP SENSOR CONNECTOR CONDITION • Switch the ignition off. • Disconnect the APP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 10.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 10.
6		No	Go to the next step.
7	INSPECT APP SENSOR NO.1 SIGNAL CIRCUIT AND APP SENSOR NO.2 SIGNAL CIRCUIT FOR SHORT TO EACH OTHER • Verify that the APP sensor and PCM connectors are disconnected. • Inspect for continuity between APP sensor terminals B and E (wiring harness-side). • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • APP sensor terminal B—PCM terminal 2AN • APP sensor terminal E—PCM terminal 2AS If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to each other. Go to Step 10.
7		No	Go to the next step.
8	INSPECT APP SENSOR NO.1 • Reconnect all disconnected connectors. • Inspect the APP sensor No.1. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Replace the accelerator pedal, then go to Step 10. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
8		No	Go to the next step.
9	INSPECT APP SENSOR NO.2 • Inspect the APP sensor No.2. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Replace the accelerator pedal, then go to the next step. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
9		No	Go to the next step.
10	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 2.2].) • Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to the next step.
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 2.2].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 2.2].)
11		No	DTC troubleshooting completed.