DTC P2121, P2126, P2131 [MZI-3.7]

id0102d2875500

DTC P2121

DTC P2126

DTC P2131

APP sensor No.1 circuit range/performance

APP sensor No.2 circuit range/performance

APP sensor No.3 circuit range/performance

DETECTION CONDITION

•  APP sensor fault flag is set for sensor No.1, No.2 and No.3 by the PCM, indicating the signal is out of the normal self-test operating range.

POSSIBLE CAUSE

•  APP sensor signal circuits are shorted each other

•  APP sensor malfunction

•  PCM malfunction

P2121

―  Open circuit wiring harness between APP sensor terminal E and PCM terminal 1AK

―  Short to ground circuit between APP sensor terminal E and PCM terminal 1AK

―  Short to power supply in wiring harness between APP sensor terminal E and PCM terminal 1AK

P2126

―  Open circuit wiring harness between APP sensor terminal H and PCM terminal 1AG

―  Short to ground circuit between APP sensor terminal H and PCM terminal 1AG

―  Short to power supply in wiring harness between APP sensor terminal H and PCM terminal 1AG

P2131

―  Open circuit wiring harness between APP sensor terminal B and PCM terminal 1AC

―  Short to ground circuit between APP sensor terminal B and PCM terminal 1AC

―  Short to power supply in wiring harness between APP sensor terminal B and PCM terminal 1AC

DTC P2121 DTC P2126 DTC P2131	APP sensor No.1 circuit range/performance APP sensor No.2 circuit range/performance APP sensor No.3 circuit range/performance
DETECTION CONDITION	• APP sensor fault flag is set for sensor No.1, No.2 and No.3 by the PCM, indicating the signal is out of the normal self-test operating range.
POSSIBLE CAUSE	• APP sensor signal circuits are shorted each other • APP sensor malfunction • PCM malfunction P2121 ― Open circuit wiring harness between APP sensor terminal E and PCM terminal 1AK ― Short to ground circuit between APP sensor terminal E and PCM terminal 1AK ― Short to power supply in wiring harness between APP sensor terminal E and PCM terminal 1AK P2126 ― Open circuit wiring harness between APP sensor terminal H and PCM terminal 1AG ― Short to ground circuit between APP sensor terminal H and PCM terminal 1AG ― Short to power supply in wiring harness between APP sensor terminal H and PCM terminal 1AG P2131 ― Open circuit wiring harness between APP sensor terminal B and PCM terminal 1AC ― Short to ground circuit between APP sensor terminal B and PCM terminal 1AC ― Short to power supply in wiring harness between APP sensor terminal B and PCM terminal 1AC

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on the 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 ACCELERATOR PEDAL FOR OBSTRUCTION • Turn the ignition switch to the ON position (Engine off). • Depress the accelerator pedal fully to the floor and release. • Does the pedal move freely to the floor and back?	Yes	Go to the next step.
3		No	Isolate and repair the obstruction.Then go to Step 12.
4	INSPECT APP SENSOR SIGNAL VOLTAGE RANGES FOR ACCELERATOR PEDAL FULLY APPLIED AND DEPRESS POSITIONS • Access the PCM and monitor the APP1, APP2 and APP3 PIDs. • Verify the following values of the PIDs when depressing the accelerator pedal fully to the floor. ― APP1: 0.48—1.79 V ― APP2: 2.95—4.62 V ― APP3: 2.43—4.02 V • Verify the following values of the PIDs when press the accelerator pedal release. ― APP1: 3.43—4.69 V ― APP2: 1.13—1.88 V ― APP3: 0.64—1.28 V • Are all PIDs signals out of range for the pedal fully depressing and released positions?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT REFERENCE VOLTAGE TO APP SENSOR • Turn the ignition switch off. • Disconnect the APP sensor connector. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between the APP sensor connector D or F terminal (wiring harness side) and the APP sensor connector C or G terminal (wiring harness side) • Is the voltage between 4—6 V?	Yes	Go to the next step.
5		No	Repair if necessary.Then go to Step 12.
6	INSPECT FUNCTIONALITY OF APP CIRCUITS Note • Use the voltage measurements from Step 4. • Are APP1, APP2 or APP3 out of range?	Yes	Go to the next Step.
6		No	Go to Step 11.
7	INSPECT FUNCTIONALITY OF APP SENSOR • Turn the ignition switch off. • Disconnect the APP sensor connector. • Measure the resistance between the following APP sensor terminals (APP sensor component side). ― E and D or F: 600—1,370 ohms ― E and C or G: 720—1,660 ohms ― E and H: 1,300—2,960 ohms ― E and B: 1,250—2,860 ohms ― H and D or F: 750—1,720 ohms ― H and C or G: 660—1,520 ohms ― H and B: 1,230—2,810 ohms ― B and D or F: 710—1,640 ohms ― B and C or G: 580—1,340 ohms ― D or F and C or G: 200—470 ohms • Are all the resistances within specifications?	Yes	Go to next Step.
7		No	Replace the accelerator pedal. Then go to Step 12.
8	INSPECT APP SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Disconnect the PCM connector. • Inspect for continuity between the following terminals: ― P2121: APP sensor terminal E and PCM terminal 1AK ― P2126: APP sensor terminal H and PCM terminal 1AG ― P2131: APP sensor terminal B and PCM terminal 1AC • Are there continuity?	Yes	Go to the next step.
8		No	Repair or replace suspected part, then go to Step 12.
9	INSPECT APP SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Inspect for continuity between the following terminals: ― P2121: APP sensor terminal E and body ground ― P2126: APP sensor terminal H and body ground ― P2131: APP sensor terminal B and body ground • Are there continuity?	Yes	Repair or replace suspected part, then go to Step 12.
9		No	Go to the next Step.
10	INSPECT APP SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between the following terminals: ― P2121: APP sensor terminal E and body ground ― P2126: APP sensor terminal H and body ground ― P2131: APP sensor terminal B and body ground • Are the voltage B+?	Yes	Repair or replace suspected part, then go to Step 12.
10		No	Go to the next Step.
11	INSPECT APP SENSOR SIGNAL CIRCUIT FOR SHORT EACH OTHER • Turn the ignition switch off. • Disconnect PCM connector. • Disconnect APP sensor connector. • Measure the resistance between the following APP sensor terminals (wiring harness-side) ― P2121 E and H E and B E and D or F E and C or G ― P2126 H and E H and B H and D or F H and C or G ― P2131 B and E B and H B and D or F B and C or G • Are there resistance greater than 10 kilohms?	Yes	Go to the next step.
11		No	Repair or replace suspected part, then go to the next step.
12	VERIFY TROUBLESHOOTING OF DTC P2121, P2126 or P2131 HAS BEEN COMPLETED • Verify that all disconnected connectors reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOEO or KOER self-test using the M‐MDS. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is the PENDING CODE for the DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7].)
12		No	Go to the next step.
13	VERIFY AFTER REPAIR PROCEDURE • Perform “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
13		No	Troubleshooting completed.