DTC P2127:00 [MZR 2.0, MZR 2.5]

id0102g3708500

DTC P2127:00

APP sensor No.2 circuit low input

DETECTION CONDITION

•  The PCM monitors the input voltage from APP sensor No.2 when the engine is running. If the input voltage is less than 0.2 V, the PCM determines that the APP sensor No.2 circuit has a malfunction.

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.

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

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  APP sensor connector or terminals malfunction

•  Short to ground or open circuit in APP sensor No.2 power supply circuit

―  Short to ground in wiring harness between main relay terminal C and APP sensor terminal A

―  ENG INJ 15 A fuse malfunction

―  Open circuit in wiring harness between main relay terminal C and APP sensor terminal A

•  Short to ground in wiring harness between APP sensor terminal B and PCM terminal 1X

•  PCM connector or terminals malfunction

•  Open circuit in wiring harness between APP sensor terminal B and PCM terminal 1X

•  APP sensor No.2 malfunction

•  PCM malfunction

DTC P2127:00	APP sensor No.2 circuit low input
DETECTION CONDITION	• The PCM monitors the input voltage from APP sensor No.2 when the engine is running. If the input voltage is less than 0.2 V, the PCM determines that the APP sensor No.2 circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA (Mode 2)/Snapshot data is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• APP sensor connector or terminals malfunction • Short to ground or open circuit in APP sensor No.2 power supply circuit ― Short to ground in wiring harness between main relay terminal C and APP sensor terminal A ― ENG INJ 15 A fuse malfunction ― Open circuit in wiring harness between main relay terminal C and APP sensor terminal A • Short to ground in wiring harness between APP sensor terminal B and PCM terminal 1X • PCM connector or terminals malfunction • Open circuit in wiring harness between APP sensor terminal B and PCM terminal 1X • APP sensor No.2 malfunction • PCM malfunction

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 repair order, then go to the next step.
2	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.
2		No	Go to the next step.
3	INSPECT APP SENSOR CONNECTOR CONDITION • Switch the ignition to off. • Disconnect the APP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 9.
3		No	Go to the next step.
4	INSPECT APP SENSOR NO.2 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • APP sensor connector is disconnected. • Switch the ignition to ON (engine off). • Measure the voltage between APP sensor terminal A (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Go to the next step.
4		No	Inspect the ENG INJ 15 A fuse. • If the fuse is melt: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the fuse. • If the fuse is deterioration: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to Step 9.
5	INSPECT APP SENSOR NO.2 SIGNAL CIRCUIT FOR SHORT TO GROUND • APP sensor connector is disconnected. • Switch the ignition to off. • Inspect for continuity between APP sensor terminal B (wiring harness-side) and body ground. • Is there continuity?	Yes	If the short to ground circuit could be detected: • Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: • Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) Go to Step 9.
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, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 9.
6		No	Go to the next step.
7	INSPECT APP SENSOR NO.2 SIGNAL CIRCUIT FOR OPEN CIRCUIT • APP sensor and PCM connectors are disconnected. • Inspect for continuity between APP sensor terminal B (wiring harness-side) and PCM terminal 1X (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 9.
8	INSPECT APP SENSOR NO.2 • Reconnect the APP sensor and PCM connectors. • Inspect the APP sensor No.2. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [MZR 2.0, MZR 2.5].) • Is there any malfunction?	Yes	Replace the accelerator pedal, then go to the next step. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].)
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 2.0, MZR 2.5].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [MZR 2.0, MZR 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 [MZR 2.0, MZR 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 [MZR 2.0, MZR 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.0, MZR 2.5].)
10		No	DTC troubleshooting completed.