DTC P2122:00 [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

DTC P2122:00 [SKYACTIV-G 2.5]


DTC P2122:00	APP sensor No.1 circuit low input
DETECTION CONDITION	The PCM monitors the input voltage from APP sensor No.1. If the input voltage at the PCM terminal 2AN is less than 0.1 V, the PCM determines that the APP sensor No.1 circuit input voltage is low. 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	Regulates the upper limit of the APP sensor output.
POSSIBLE CAUSE	APP sensor connector or terminals malfunction Short to ground in wiring harness between the following terminals: APP sensor terminal A—PCM terminal 2AR APP sensor terminal B—PCM terminal 2AN PCM connector or terminals malfunction APP sensor No.1 signal circuit and ground circuit are shorted to each other Open circuit in wiring harness between the following terminals: APP sensor terminal A—PCM terminal 2AR APP sensor terminal B—PCM terminal 2AN APP sensor No.1 malfunction PCM malfunction

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Related PIDs


Item (definition)	Unit/Condition	Definition	Condition/Specification (Reference)
APP1	%	APP sensor No.1	Accelerator pedal released: Approx. 15% Accelerator pedal depressed: Approx. 82%
APP1	V	APP sensor No.1	Accelerator pedal released: Approx. 0.75 V Accelerator pedal depressed: Approx. 4.1 V
APP2	%	APP sensor No.2	Accelerator pedal released: Approx. 7.45% Accelerator pedal depressed: Approx. 41%
APP2	V	APP sensor No.2	Accelerator pedal released: Approx. 0.38 V Accelerator pedal depressed: Approx. 2.05 V

Diagnostic Procedure


STEP	INSPECTION		ACTION
1	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.
1		No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	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 9.
3		No	Go to the next step.
4	INSPECT APP SENSOR NO.1 CIRCUIT FOR SHORT TO GROUND Verify that the APP sensor connector is disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: APP sensor terminal A APP sensor terminal B Is there continuity?	Yes	If the short to ground circuit could be detected in the wiring harness: Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: APP sensor terminal A—PCM terminal 2AR APP sensor terminal B—PCM terminal 2AN 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 ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. If the short to ground circuit could not be detected in the wiring harness: Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to Step 9.
4		No	Go to the next step.
5	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 9.
5		No	Go to the next step.
6	INSPECT APP SENSOR NO.1 SIGNAL CIRCUIT AND GROUND 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 C (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 C—PCM terminal 2AO 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 9.
6		No	Go to the next step.
7	INSPECT APP SENSOR NO.1 CIRCUIT FOR OPEN CIRCUIT Verify that the APP sensor and PCM connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): APP sensor terminal A—PCM terminal 2AR APP sensor terminal B—PCM terminal 2AN Is there continuity?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: APP sensor terminal A—PCM terminal 2AR APP sensor terminal B—PCM terminal 2AN 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 an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 9.
8	INSPECT APP SENSOR NO.1 Reconnect all disconnected connectors. Inspect the APP sensor No.1. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [SKYACTIV-G 2.5].) Is there any malfunction?	Yes	Replace the accelerator pedal, then go to the next step. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
8		No	Go to the next step.
9	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-G 2.5].) Start the engine. Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [SKYACTIV-G 2.5].) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5].)
10		No	DTC troubleshooting completed.

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